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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Journal of Horticultural Science and Technology
Journal Basic Information
Journal DOI :
Korean Society of Horticultural Science
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Volume & Issues
Volume 25, Issue 4 - Dec 2007
Volume 25, Issue 3 - Sep 2007
Volume 25, Issue 2 - Jun 2007
Volume 25, Issue 1 - Mar 2007
Selecting the target year
Analysis of Genetic Similarity of Dolsan Leaf Mustard Based on Several Horticultural Traits and RAPD
Park, Han-Ju ; Lee, In-Ho ; Kim, Hoy-Taek ; Yang, Seung-Yul ; Nou, Ill-Sup ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 305~310
The characteristics of 24 leaf mustard (Brassia juncea) accessions were analyzed using quantitative characters and principal component analysis. Cumulative contribution of fresh weight, dry weight, leaf length and number of leaf showed high volume by the principal component analysis. The genetic relationship among 24 accessions can be analized by these four characters. In addition the ‘Goheung dongil’ was selected for greatest accessions in only yield side. RAPD marker was used to analysis the DNA polymorphism and genectic relationship among 24 accessions. Four random primers were selected by which 12 polymorphic bands. Based on the UPGMA cluster analysis 24 accessions were separated into five groups. However, the results that showed very close relationship in quantitative character analysis were not constantly agreed with RAPD analysis. The results of quantitative analysis and application of the 12 RAPD markers are available for the F1 hybrid production by using cytoplasmic male sterility of leaf mustard.
Effects of Warehouse Types and Packaging Methods on the Quality of Potatoes after Wound-healing
Park, Jong-Nam ; Kang, Jung-Phil ; Kyoung, Jang-Hyun ; Jeong, Cheon-Soon ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 311~315
This study was conducted to investigate the effects of warehouse types (semi-underground warehouse and improved warehouse) and packaging methods (PP-bag and P-container) on the quality in potatoes (Solanum tuberosum L) during storage period. Total sugar contents were approximately 1% after 4 weeks in the semi-underground warehouse, and sharply increased by 4% after 20 weeks. However, those in the improved warehouse were about 3% after 4 weeks, and did not show conspicuous change for storage. On the other hand, a curing treatment and packaging methods had no influence on the total sugar contents. The hardness was higher in the curing treatment than in the control, but there was no difference in the warehouse types and packaging methods. The weight loss was significantly higher in the semi-underground warehouse than in the improved warehouse. On the other hand, it in the semi-underground warehouse was somewhat higher in the control and the P-container than in the curing treatment and the PP-bag, respectively. Also, it in the improved warehouse was rather high in the P-container, but it was not influenced by curing treatment. The decay rate in the improved warehouse was remarkably lower than in the semi-underground warehouse, and it was also low in the curing treatment and P-container when compared to the control and PP-bag. Accordingly, wound-healed potatoes must be packaged with P-container and stored in the improved warehouse to maintain quality of potatoes for storage.
Occurrence Pattern of Pests in Carrot Fields and Effect of Plant Debris Removal after Harvest at Highland Area
Kwon, Min ; Ryu, Kyeong-Yeol ; Kim, Jeom-Soon ; Shin, Gwan-Yong ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 316~321
To investigate the effect of soil-dressing in carrot field on pests occurrence, totally 50 fields cultivating carrot were chosen within Pyeongchang area, where highland adoptable carrots were cultivated every year. Also, occurrence degree of pests was surveyed by species and by times for 5 carrot fields including one pesticide-free field. In addition, relationship between phytophagous nematode density and soil physico-chemical components (soil pH, EC, content of NH₄₋N, NO₃₋N, organic matter, P, Ca, Mg and K) was analyzed. Occurrence pattern of carrot pests at highland region was slightly different from that at plain area. Among eight diseases surveyed, alternaria leaf blight (Alternaria dauci) was most serious, if not controled, infection degree could reach more than 70%. The appropriate fungicide-spraying period for the control of this disease would be mid July the most in the field. Density of phytophagous nematode and yearly soil-dressing intervals did not represent a significant correlation. Furthermore, no significant correlation between nematode density and soil physico-chemical components was confirmed. The effect of field sanitation on pests occurrence next year was not certain in this study. Both debris-left plot and debris-cleared plot showed a similar occurrence degree of pests, e.g. 50~60% on average for alternaria leaf blight. Therefore, it is necessary that removal of plant debris from the fields after harvest should be re-examined deeply in reference to soil erosion protection not pests occurrence.
Development of Micropropagation Methods of Shallot (Allium cepa var. ascalonicum Backer)
Cho, Yong-Cho ; Moon, Jin-Seong ; Song, Ju-Yeon ; Jeong, Byoung-Ryong ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 322~327
Shallot is a foreign crop introduced from France in 1995 as a new overwintering field crop with a aim to develop into an export crop. During the introductory cultivation trials, several problems were raised such as premature growth depression in early summer, sensitivity to summer moisture, and weakened vigor of the seed bulbs following successive propagations. This study was conducted to suggest cultural and propagational solutions to these problems. Genetically stable plantlets were obtained by the basal plate culture. Floral organ culture was considered as a good method because it produced plantlets with multiple shoots after 30 days in culture. However, more time was required for bulblet formation than in the disc culture. It took 140 days to obtain seed bulblets in the basal plate culture, 250 days in the floral organ culture, and 320 days in the meristem culture. Total number of days taken for micropropagation in the basal plate culture was 56% and 44% of that in the floral organ culture and meristem culture, respectively. On the contrary, the speed of propagation of the floral organ culture was 4 to 13 times as high as that of the basal plate culture. To summarize, meristem culture was good for obtaining virus-free bulbs, but was limited by a long culture period and a low propagation speed.
Efficient Purity Testing of
Hybrid Seeds without Electrophoresis in Chili Pepper (Capsicum annuum L.)
Jang, In-Ok ; Park, Hyo-Guen ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 328~333
The study was performed to develop an efficient DNA detection method for the determination of the genetic purity of F₁ hybrid seeds essential for seeds production in chili pepper (Capsicum annuum L.). Testing methods of genetic purity of seeds, such as field test, electrophoresis of isozymes, DNA marker etc, are in current use. Recently the RAPD method has been developed and come into use as a means of testing the genetic purity of chili pepper seeds. Experiments were performed to make an improvement on the RAPD method for detecting DNA without electrophoresis. The accuracy, swiftness, easy access, practicability and cost efficiency of RAPD method were greatly improved after making SCAR primers. Specific SCAR primers made it possible to detect contaminated seeds without electrophoresis by PCR with mixture containing EtBr in 0.5 ㎖ tube, or direct visualization of amplified DNA fragment with EtBr at multiwell plate. Blind tests were conducted to confirm the applicability of this study. In the practical tests, P₁-specific primers (DMM-1 and DMM-8) could detect contaminated seeds without electrophoresis by PCR with mixture containing EtBr among 200 leaves and 200 seeds. P₂-specific primers (DMP-1 and DMP-2) could detect contaminated seeds with electrophoresis but not by PCR with mixture containing EtBr among 200 leaves and 200 seeds which seed company had supplied after adding other variety to samples, although it can not occur in real situation to harvest seeds. In conclusion, direct detection of the amplified DNA by PCR with mixture containing EtBr was found applicable for testing the purity of F1 seeds because it reduced the total test time from 24 hours to about 4 hours on 40 samples and improved the accuracy, easy access, cost efficiency and practicability.
Genetic Analysis of Soluble Solid Contents in Strawberry (Fragaria x ananassa Duch.) by a Half-Diallel Cross
Shim, Jae-Suk ; Cheon, Kyeong-Seong ; Oh, Ju-Youl ; Hwang, Hae-Jun ; Yoon, Hye-Suk ; Shon, Gil-Man ; Kim, Zhoo-Hyeon ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 334~346
Forty one germplasm accessions were tested for their soluble solid contents (SSC). Of them, eight accessions which are the leading cultivars, showing significant difference among them, were selected and crossed each other for making 8-parents half-diallel set. The expression of SSC of the F1s varied depending upon the parents. Average SSC of all F₁ seedlings was lower than the mean of all parents, but similar to or a little higher than the mean of all S₁ seedlings obtained from selfed parents. The mean of all S₁ seedlings were lower than those of all parents. The mean of superior 10% of F₁ seedlings of each cross was almost higher than superior parents and the mean of superior 10% S₁ seedlings. Also, almost superior 10% S₁ exceeded over their parents. In (Vr, Wr) regression analysis, when using parents and means of all F₁ seedlings of each cross, the direction of dominance was toward to lower SSC, but when using parents and means of superior 10% F₁ seedlings of each cross, higher SSC was expressed in over-dominance mode, which could expect much more superior F₁ seedlings in the combinations with higher SSC parents. The results in analysis of combining ability, which both GCA and SCA were highly significant, were similar with those in regression analysis, and variance of GCA was larger than that of SCA. The higher in the mean SSC of all F₁ seedlings did not always guarantee the higher mean SSC of superior 10% F₁ seedlings. While the higher mean SSC of superior 10% F₁ seedlings was, the larger SCA of superior 10% F₁ seedlings was observed. The better parents, expected for producing more superior F₁ seedlings, were ‘Maehyang’, ‘Tochiotome’, ‘Akihime’, and ‘Yeobong’. Of them, ‘Maehyang’ and ‘Tochiodome’ were the best parents in the respect on improving SSC. The best combinations for increasing SSC were ‘Maehyang’ x ‘Johong’, ‘Maehyang’ x ‘Tochiotome’, ‘Maehyang’ x ‘Toyonoka’, followed by ‘Maehyang’ x ‘Yeobong’, ‘Maehyang’ x ‘Akihime’, ‘Johong’ x ‘Tochiotome’, ‘Tochiotome’ x ‘Yeobong’, and ‘Tochiotome’ x ‘Red pearl’, in order.
Effect of 1-Methylcyclopropene on the Quality of Cherry Tomato with Different Ripening Stage
Cho, Mi-Ae ; Hong, Yoon-Pyo ; Choi, Sun-Young ; Huber, Donald J. ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 347~354
Cherry tomatoes (Lycopersicon esculentum L. cv. BHN265) were harvested at pink-light red (P-LR) and light red-red (LR-R) stage. They were treated with 0.5μLㆍℓ⁻¹ 1-methylcyclopropene (1-MCP) for 24 hours at 20℃ before storage to evaluate the effectiveness of 1-MCP for extending shelf-life. As the time elapsed after treatment, 1-MCP treated fruit showed less weight loss and more slow changes in color, firmness and titratable acidity than non-treated fruit during 41 storage days. Lower ethylene and carbon dioxide production rates in 1-MCP treated cherry tomatoes at the initial period (5~7 days) of storage appeared to be the main cause of quality maintenance. 1-MCP had an effect on the extension of shelf-life of cherry tomatoes at the P-LR and LR-R stage of development because of maintaining color, firmness and titratable acidity, especially P-LR was more effective stage than LR-R stage for 1-MCP treatment to preserve quality of cherry tomatoes according to the general appearance and the change rates of quality factors.
Effect of Media Composition on Growth and Rooting of Highbush Blueberry Cuttings
Lee, Jun-Gu ; Lee, Byoung-Yil ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 355~359
Shoot growth and root ball developments on several media compositions were evaluated to establish efficient cutting propagation methods of highbush blueberries, which had not been introduced and cultivated in Korea. Shoot growth of highbush blueberry cuttings were simultaneously monitored for 4 months after cutting and their rooting were measured with arbitrary grades to calculate root ball developments. Shoot growth was favorable in sole peatmoss and mixed peatmoss containing 25% volume ratio of sand. Root ball developments were significantly enhanced by media compositions especially by the mixed ratio of peatmoss, indicating significant relationship with the pH levels of cutting media. The compositions of respective rooting medium also affected the post-transplant cutting growth. The cuttings, grown on perlite or vermiculite, showed lower shoot growth rates after transplanting rather than on peatmoss-based media. Our results show that peatmoss-based media are the most suitable for highbush blueberry cutting propagation, but more balanced nutrient and water management are needed to achieve higher cutting propagation efficiencies.
Determination of Optimum Harvest Time for 'Hwasan' (Pyrus pyrifolia Nakai) on the Premise of the Shelf Life at Ambient Temperature
Kim, Yoon-Kyeong ; Kang, Sam-Seok ; Cho, Kwang-Sik ; Kim, Myung-Su ; Jeong, Sang-Bouk ; Son, Dong-Su ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 360~363
‘Hwasan’ (Pyrus pyrifolia Nakai) is harvested in 160 days after full bloom (DAFB). But the fruit which is harvested at this point has a problem in the marketing for short shelf life, about 10 days. So, this study was aimed for determining the optimum matured time and harvest time on the premise of shelf life of ‘Hwasan’. The change of fruit characteristics was investigated from 135 to 160 DAFB in each 5 days terms and the shelf life of each fruits was examined. In the result of this experiment, starch concentration rapidly decreased in 140 DAFB, the change of soluble solids concentration of fruit harvested after 150 DAFB is gentle 13.0oBx or above and sucrose concentration reached the highest peak 5% at 155 DAFB. The horticultural harvest time is about 150 DAFB in terms of changes of hardness, soluble solid concentration and starch concentration. The fruit harvested in 150 DAFB is sustained 12 N during 30 days at ambient temperature and it is edible. Also the hardness of fruit harvested in 165 DAFB decreased less than 12 N and the freshness of fruit is a little bit low and sometimes the smell is strange after 10 days at ambient temperature. The shelf life of fruit harvested in 150, 155-160 and 160 DAFB are about 30, 20 and 10 days respectively in terms of changes of water loss, soluble solids concentration, hardness and sensory evaluation.
Fruit Color Improvement by Bacillus lateosporus in Grapes
Park, Hee-Seung ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 364~368
Fruit color improvement in grapes was investigated with the use of Bacillus lateosporus, an avirulent bacterium. The anthocyanin contents of ‘Campbell Early’ and ‘Kyoho’ in 2001 were 126.13㎍ㆍ㎝⁻² and 21.10㎍ㆍ㎝⁻², and those in 2002 were 92.08㎍ㆍ㎝⁻² and 10.18㎍ㆍ㎝⁻², respectively. Therefore, different varieties might bring up five to nine times difference in anthocyanin contents and different years could result more than twice difference in ‘kyoho’ grape. Foliar spray of Bacillus lateosporus increased anthocyanin content, which was more effective for the fruits with poor skin color. That is, those foliar application leveled up the anthocyanin content for ‘Campbell Early’ from 57.91㎍ㆍ㎝⁻² to 89.84 ㎍ㆍ㎝⁻² in 2000 and for ‘Kyoho’ rose from 10.18㎍ㆍ㎝⁻² to 29.65㎍ㆍ㎝⁻². However, foliar spray did not influence Brix degree and fruit enlargement.
1-Methylcyclopropene Increases the Shelf-life of 'Ooishiwase' Plums (Prunus salicina L.)
Oh, Soh-Young ; Lim, Byung-Seon ; Lee, Jae-Wook ; Do, Kyung-Ran ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 369~374
This study was conducted to investigate the effect of 1-MCP on the postharvest life of ‘Ooishiwase’ plum. Plums were treated with 1 μLㆍℓ⁻¹ 1-MCP at 10℃ for 24 h. Treated plums were divided in groups according to purpose before storage. Group Ⅰ was used to examine the effect of 1-MCP on plum ripening at 20℃. Group Ⅱ was used to examine the effect of 1-MCP on plum ripening at 20℃ and 0℃ storage. Our results found out that 1-MCP reduced production of ethylene, CO₂ and softening of plum fruits. The change in the rind color was delayed. Moreover, soluble solids content was not affected and decay caused by Botrytis cinerea and Penicillium expansum was reduced during storage. 1-MCP can be utilized as an effective means of maintaining quality and extending shelf life of plums.
Relation between Shoot Vigour and Bud Necrosis in 'Campbell Early' Grapevines
Choi, In-Myung ; Lee, Chang-Hoo ; Hong, Yoon-Pyo ; Park, Hee-Seung ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 375~381
This study was carried out to investigate the incidences of main, accessory and axillary bud necrosis in different node position and cane vigour in ‘Campbell Early’ grapevines. Main bud necrosis of ‘Campbell Early’ grapevines occurred from 30 days after full bloom, increased sharply during 50~60 days after full bloom, and increased slowly from 60 to 120 days. Although rate of accessory bud necrosis was lower than main bud necrosis, main and accessory bud had same necroses pattern. Main bud necrosis occurred earlier and higher in the basal buds (1st to 3rd buds) than the more distal buds on a shoot. But as plant grew, main bud necrosis increased in the buds of middle position in shoot (4th to 9th buds) at 50~60 days after full bloom. At rest stage, the mean incidence of main bud necrosis was 28.6% in weak canes (shoot diameter below 8.0 ㎜), 58.0~77.6% in moderate canes (8.1~11.0 ㎜) and 96.8% in very vigorous canes (above 11.1 ㎜). Incidences of main bud necrosis in different longitudinal bud sizes were 22.4% in 4.1~5.0 ㎜, 49.2% to 53.8% in below 4.0 ㎜ and 60% in above 5.1 ㎜ respectively. As vine age shoot is produced strongly, thus main bud necrosis in the vines showed a tendency of continuous increase with their growth.
Effect of the Exposed Length of M.9 Rootstock on Growth and Productivity of 'Fuji' and 'Hongro' Apples
Paek, Pong-Nyeol ; Kim, Mok-Jong ; Kwon, Soon-Il ; Nam, Jong-Chul ; Kang, Seong-Mo ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 382~388
To determine the optimum length of M.9 for ‘Fuji’ and ‘Hongro’ apples (Malus domestica Borkh.), the trees were planted in such a way that the exposed length of the rootstock to be 0, 10, 20, and 40 ㎝. Tree growth and fruit production were then evaluated for six years. The longer the exposure, the less the increase in TCSA of ‘Fuji’ and ‘Hongro’ by the sixth year after planting, at which time the 10-, 20- and 40-㎝ trees showed a 92, 72 and 49% in ‘Fuji’ and an 82, 57, and 34% of the TCSA with 0-㎝ trees in ‘Hongro,’ respectively. The swelling of the rootstock was obvious, but was less at the lower portion as the exposed length of M.9 increased. Shoot growth and leaf areas of 6-year-old trees were less with a longer M.9. Dry weight of both scion cultivars and the roots of 6-year-old trees declined more with a longer exposure of M.9. The top-to-root ratios were in 2.8 to 3.8 ranges in ‘Fuji’ and in 2.3 to 2.5 ranges in ‘Hongro’ depending on the length of M.9. The cumulative yield by the sixth year of ‘Fuji’ apples was not significantly different among 0-, 10- and 20-㎝ trees but was low in 40-㎝ trees. However, cumulative yield efficiency was higher in the trees with a longer exposure of M.9. Similar results were obtained with ‘Hongro,’ but the highest cumulative yield was from the 10-㎝ trees. The length of M.9 affected fruit quality little in both cultivars. Considering tree growth and productivity for the first six years after planting, it was concluded that the optimum length of M.9 exposure was 20 ㎝ for ‘Fuji’ and 10 to 20 ㎝ for ‘Hongro’ at the planting distance of 4 × 1.5 m.
Comparison of Fruit Quality and Vegetative Growth in 'Kyoho' Grape by Crop Load and Thinning
Shim, Sung-Bo ; Kwon, Yong-Hee ; Hong, Yoon-Pyo ; Park, Hee-Seung ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 389~393
To find out proper crop load in ‘Kyoho’ grapevine, crop load was adjusted as heavy (about 2,500 ㎏ㆍ10 a⁻¹) and light (about 1,800 ㎏ㆍ10 a⁻¹) degrees, and cluster thinning was achieved by three degrees, light (about 700 g/cluster), medium (about 500 g/cluster), and strong (350 g/cluster). At 90 days after full bloom (DAFB), clusters with over than 8 coloring degree, which was measured by the color chart developed by National Horticultural Research Institute, RDA, Korea, were harvested. Then, the rest was harvested at 108 DAFB. All berry clusters produced larger berries in the vines with light crop load. The berry cluster with strong berry thinning did not show any difference in soluble solids content regardless of the difference in crop load. However, the berry clusters with medium and light berry thinning had higher soluble solids in the vines with light crop load. There were no differences in titratable acidity according to treatments. Heavy cropping delayed berry ripening with more frequent berry cracking. Light cropping showed more even berry ripening with higher fruit quality.
Survey on the Damage of Pear Orchards Caused by Typhoon 'Maemi' in Ulsan District
Kang, Sam-Seok ; Cho, Kwang-Sik ; Son, Dong-Su ; Kim, Myung-Su ; Kim, Jung-Bae ; Song, Jang-Hoon ; Kim, Yoon-Kyeong ; Park, Un-Gi ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 394~399
The damage caused by the sea wind accompanied by typhoon “Maemi” in September 2003 was investigated in Ulsan pear orchards. Slope direction of pear orchards had a close relationship with the salt wind damage. Damage at orchard facing the south and flatland near the sea was considerably severe, while orchards facing north or northwest were relatively slight. Another factor influencing the severity of damage was the distance of pear orchards from the sea coast. Orchards closely neighbored the coast showed heavy salt wind damage. Windbreak also affected the damage. Pine tree windbreaks were the most effective in the prevention of and the followings were Spindle tree, Japanese cypress, and Oriental arbor vitae. The extent of damage was 4.5 at ‘Chojuro’, and 8.5 at ‘Niitaka’. Furthermore, the positive correlation was found between the severity of damage and the sodium concentration of leaves. However, there is no difference in the sodium concentration of soil both damaged orchards and normal ones.
Changes in Photosynthesis and Chlorophyll Fluorescence of 'Campbell Early' and 'Kyoho' Grapevine under Long-term Waterlogging Condition
Kang, Seok-Beom ; Jang, Han-Ik ; Lee, In-Bog ; Park, Jin-Myeon ; Moon, Doo-Khil ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 400~407
This experiment was carried out to find out the effect of long-term waterlogging on the photosynthesis, chlorophyll fluorescence and related physiological response of two-year old ‘Campbell Early’ and ‘Kyoho’ grapevine from June 14 to July 14, 2005. For the experiment, two-year old grapevine seedlings were transplanted to 40 L pot with a sandy loam soil. During the experiment, irrigation of control treatment was controlled at -40 ㎪ of soil water tension, and water levels of the pots in waterlogging treatments were kept at above 10 ㎝ from the soil surface using tap water. After waterlogging, stomatal conductance (gs) of ‘Campbell Early’ and ‘Kyoho’ was rapidly decreased within 7 days and transpiration rate (E) was 19.2 and 11.1% levels of the control within 14 days respectively. But leaf-to air water vapor pressure deficit on leaf temperature (VpdL) of ‘Campbell Early’ and ‘Kyoho’ maintained highly compare with control from 7 days after waterlogging. Intercellular CO₂ concentration (Ci) of grapevine leaf was significantly low and ‘Campbell Early’ maintained higher net CO₂ assimilation (ACO₂) than ‘Kyoho’ in waterlogging. There was no significant difference in Fv/Fm of ‘Campbell Early’ at 14 days after waterlogging but significantly decreased at 21 days. However, yield and ETR of chlorophyll fluorescence was decreased to 85.4 and 71.3% in ‘Kyoho’ but 47.4 and 67.9% in ‘Campbell Early’ at 24 days after waterlogging compare with control. Thus, ‘Campbell Early’ thought to be more tolerant than ‘Kyoho’ in photosynthesis in long-term waterlogging condition.
Causes of Tree Vigor Weakening and Occurrence of Deformed Fruit in 'Hongro' Apple Trees
Kim, Jeam-Kuk ; Seo, Hyeong-Ho ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 408~412
This study was conducted to investigate the causes of tree vigor weakening and occurrence of deformed fruit in problem of cultivation in ‘Hongro’ apple trees (Malus domestica). ‘Hongro’ apple, compared to ‘Tsugaru’ apple, had more flower buds including axillary flower buds. Therefore, the vigor weakening in ‘Hongro’ apple trees was due to extremely a lot of flowers and could be prevented with blossom thinning and N fertilizer by twice supply. Occurrence of deformed fruit was not different between terminal fruits and axillary fruits, but fruits set on lateral fruiting branch and weak vigor tree occurred a few deformed fruit.
Regulation of the Harvesting Time of Cut-Flowers by the Pruning Time of Overwintered Gypsophila paniculata Plants in Subalpine Area
Cheong, Dong-Chun ; Kim, Kab-Cheol ; Lim, Hoi-Chun ; Song, Young-Ju ; Choi, Chang-Hak ; Kang, Mi-Hyung ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 413~417
This study was carried out to extend and regulate the flowering time in summer season by pruning at different date the aerial part remained of overwintered Gypsophila paniculata plants. As the pruning time of aerial part was delayed, shoot emergence rate at each pruning time was higher, the content of sucrose, glucose and zeatin in roots decreased, but GAs and IAA increased. The days to flower budding and blooming were shortened, but flowering characteristics and cut flowers quality came down by pruning late the aerial part. The main harvesting time of control was from June 11 to June 19, that of pruning time of Mar. 30, Apr. 15 and Apr. 30 was from June 15 to June 26, from June 19 to July 2 and from June 28 to July 14, respectively. So in subalpine area the aerial parts of Gypsophila paniculata plants remained after harvesting cut-flowers between October and November were overwintered, then by pruning after March 30, the flowering time could be extended and the labor power dispersed.
Development of Labor-saving Pest Management System for Cut Flower Rose Cultivation
Kang, Taek-Jun ; Jeon, Heung-Yong ; Yang, Chang-Yul ; Kim, Hyeong-Hwan ; Cho, Myoung-Rae ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 418~424
This study was conducted to develop labor-saving pest management system by reduced pesticide sprays for cut flower rose cultivation in greenhouses. The number of pesticide spray in conventional rose greenhouses was estimated as over 40 times per year, and the major pests related with the pesticide sprays were two-spotted spider mite (Tetranychus urticae), western flower thrip (Frankliniella occidentalis), sweetpotato whitefly (Bemisia tabaci), aphids, and moths. Major problems in conventional spray were resistance of pests against pesticides and too high pest management cost. So, we developed pest management system with reduced pesticide sprays by considering occurrences and control efficiencies of each pest in cut-rose cultivations. In a comparison of pest control efficiencies between reduced and conventional sprays, the pest densities in reduced sprays were similar to those of conventional sprays. Spatial distribution of two-spotted spider mites in a commercial rose greenhouse in Gimje was analyzed with the Taylor’s power law. The two-spotted spider mites showed a clumped distribution (TPL b = 1.61 ＞ 1), and a simple sampling method was developed by using binomial counts of the mites in the leaves. The results showed that it would be possible to successfully manage insect pests in rose cultivation by timely spray of pesticides with reduced number for labor and cost savings in commercial cut flower rose cultivations.
Breeding of a Bright Pink Gerbera 'Yeunhwa' for Cut Flower
Park, Jae-Suk ; Jang, Sung-Won ; Kim, Hyun-Sun ; Kang, Hyu-Hyun ; Kim, Chang-Kil ; Chung, Jae-Dong ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 425~428
A new bright pink gerbera (Gerbera hybrida Hort.) ‘Yeunhwa’ was developed by crossed ‘Beauty’ and ‘Ansofie’ at Yoengju Agricultural Technology Extention Center. One breeding line, 2001-20, was selected in 2000 based on flower color and productivity on the first selection. A backcrossed line, 2002-202, was selected by crossing ‘2001-20’ and ‘Ansofie’ on Daegu, Suwon and Yoengju Agricultural Technology Extention Center in 2001. Characteristics trials were conducted three times from 2003 to 2005. Bred cultivar ‘Yeunhwa’ showed pink color (RP 62-A), green center, semi-double type and middle size flower with stable flower shape. The average productivity for three years was 70.0 stems per plant and increased 35.9% compared to that of cultivar ‘Rozalin’ which showed 51.5 stems. The vase life was 7.5 days. After winter season, the survival rate of cultivar ‘Yeunhwa’ was higher than that of cultivar ‘Rozalin’.
Effect of Media and Planting Depth on Growth of Cacti and Succulents in a Pot
Song, Cheon-Young ; Lee, Sang-Deok ; Park, In-Tae ; Cho, Chang-Hee ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 429~435
This experiment was conducted to investigate the effect of planting depth and medium composition on survivals and growth of several cacti and succulent plants mingled planting in a pot. Ferocactus horridus, Notocactus magnificus, Mammillaria klissingiana, Pseudoespostoa spp., Eriocactus leninghausii were planted deep into 3 ㎝ to 6 ㎝ showed better growth in plant height and width than that of planted deep into 9 ㎝. Soil media suitable for growth of plant and light of the weight were investigated by mixing various ratio of big size of sand, soil and perlite planting in a pot of cacti and succulents such as Pachycereus pringlei, Notocactus magnificus, Ferocactus horridus, Mammillaria spinosissima, Mammillaria spp., Faucaria tigrina, Haworthia fasciata, Echeveria pulvinata, Echeveria pumila and Crassula argentea. Their plant growth and mortality were monitored for four month after planting in a pot. The media based on big size of sand 2: soil 3: perlite 5 by volume, showed better plant growth in height and width and lighter than that of based big size of sand 5: soil 3: perlite 2. However there was no mortality of plant in all treatment.
Effect of Indoor Position on Growth of Cacti and Succulents Planted in a Pot
Song, Cheon-Young ; Lee, Sang-Deok ; Park, In-Tae ; Lee, Jeong-Sik ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 436~442
This experiment was conducted to investigate the effect of indoor position on survivals and growth of several cacti and succulents planted in a pot. Echinocactus grusonii, Marginatocereus marginatus, Myrtillocactus geometrizans, Pachycereus pringlei, Eriocactus leninghausii. Gymnocalycium mihanovichii var. friedrichii, Notocactus magnificus, Portulacaria afra v. foliis-variegatis, Haworthia fasciata, and Aloe squarrosa were positioned near to window, outside indoor, inside indoor and greenhouse for four months, and monitored their plant growth and mortality. The plants of indoor including outside and inside, very low light intensity ranged from 2.8 to 13.4 μmolㆍm⁻²s⁻¹, were overgrown in Marginatocereus marginatus, Myrtillocactus geometrizans, and Aloe squarrosa, and increased mortality in Gymnocalycium mihanovichii, Eriocactus leninghausii, Notocactus magnificus, Portulacaria afra v. foliis-variegatis, and Aloe squarrosa, but did not influence in the other plants. Plant height and width in the greenhouse and near to window tended to be higher than those of outside and inside indoor. Thus, proper indoor position of several cacti and succulents planted in a pot was near to window, showing the most strong light intensity in indoor.
Effect of Plant Growth Retardants on the Growth Characteristics of Potted Spathiphyllum in an Ebb and Flow System
Won, Eun-Jeong ; Jeong, Byoung-Ryong ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 443~450
Effect of concentrations of plant growth retardants (PGRs) supplied to a recirculated nutrient solution in an ebb and flow system on the growth characteristics of potted Spathiphyllum ‘Top-Pin’ and ‘Mini’ was examined. Plants were planted in 10 ㎝ plastic pots, containing a mixture of peat moss and perlite (1:1, v/v) on 29 Mar. 2006 and were grown until 27 Feb. 2007. The PGRs used were 0.5, 1.0, 1.5, 2.0 ㎎ㆍℓ⁻¹ paclobutrazol (Boundy), 300, 400, 500, 600 ㎎ㆍℓ⁻¹ CCC (Cycocel), and 10, 15, 20, 25 ㎎ㆍℓ⁻¹ ethephon (Florel). Plant height decreased by all PGRs tested. Paclobutrazol was the most effective in inhibition of plant height, plant width, and petiole length. The effect increased with increasing paclobutrazol concentration, accompanied with increasing chlorophyll contents, leaf length, and leaf area. However, paclobutrazol caused phytotoxicity, when applied at a 2.0 ㎎ㆍℓ⁻¹ concentration. Treatment of CCC reduced plant height, but produced phytotoxic symptoms and even plant death, especially at high concentrations. All concentrations of ethephon gave a minor effect on growth, and ‘Top-Pin’ at 25 ㎎ㆍℓ⁻¹ and ‘Mini’ at 20 ㎎ㆍℓ⁻¹ treatments resulted in the greatest reduction of plant height and leaf width. ‘Mini’ was more sensitive than ‘Top-Pin’ in all treatments. The results suggested that paclobutrazol is the most suitable PGR among the tested PGRs to produce a potted Spathiphyllum in a recirculation ebb and flow system.
Effects of Low-temperature Water in Vase on the Hydraulic Physiological Characteristics and Senescence of Cut Roses (Rosa spp. 'Red Sandra')
In, Byung-Chun ; Chang, Myoung-Kap ; Son, Ki-Cheol ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 451~457
This study was investigated the effect of low-temperature water in a vase on the hydraulic physiological characteristics and senescence of cut roses. Freshly harvested ‘Red Sandra’ roses (Rosa spp.) were held in low-temperature (7℃) or ambient-temperature (22.8℃) water and kept in an environment-controlled room (23℃, 60% RH and 12-h photoperiod at 20 μmolㆍm⁻¹ㆍsec⁻¹ PPF) during the vase period. To closely investigate water flow patterns during vase life, stem flux rate, stem diameter, leaf temperature, and leaf boundary layer resistance (BLR) were continuously measured using phyto-monitoring system. Cut roses held in low-temperature water showed a higher rate of water uptake and a higher stem flux rate than those held in ambient-temperature water, which led to the effective maintenance of fresh weight and water balance, and consequently a longer vase life. Placing roses in low-temperature water also resulted in decrease in leaf temperature and BLR and rhythmic changes in stem flux in accordance with water flow. As found in this study, placing roses in low-temperature water speed up water flow by reducing the hydraulic resistance of cut rose stems. This may be resulted from dissolving the air, increasing the cohesion-tension, and the transpiration rate.
Flower Color Change of Boronia heterophylla as Affected by Light Intensity and Preservative Chemicals
Lee, Kang-Mo ; Jeong, Tae-Yong ; Song, Ju-Yeon ; Jeong, Byoung-Ryong ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 458~462
This study was conducted to examine the effect of ethylene inhibitors [1-methylcyclopropene (1-MCP) and amininooxyacetic acid (AOA)] and light intensity on flower color deterioration of potted Boronia heterophylla plants. We tested 1-MCP and AOA as ethylene inhibitors or senescence-inhibiting chemicals, and ethepon as a senescence-promoting chemical. Along with two light conditions, lab and greenhouse, plants were treated with different combinations of chemicals and application methods (1-MCP vaporization, 1-MCP vaporization plus ethepon spray, AOA spray, AOA drench, AOA spray plus ethepon spray, AOA drench plus ethepon spray, and ethepon spray). The experiment was laid out in a split-plot design with four replications per treatment. The recorded environmental conditions in the greenhouse were 36.9% relative humidity, 23.2℃ temperature, and 901 μmolㆍm⁻²ㆍs⁻¹ light intensity, and in the lab were 68.2% relative humidity, 17.5℃ temperature, and 35 μmolㆍm⁻²ㆍs⁻¹ light intensity. The changes in anthocyanin content and flower color were measured. Although senescence-inhibiting and senescence-promoting chemicals were expected to cause changes in the anthocyanin content and flower color deterioration, there was no signigicant differences among the treatments. Since keeping boronia plants in the greenhouse, having higher light intensity, is more efficient than keeping them in the lab to maintain antocyanin content and the flower color, it is concluded that light intensity had a major effect, while senescence-inhibiting and senescence-promoting chemicals played a minor role. More research using a diverse light intensities are needed in the future.
Effects of Cutting Time and Plant Growth Regulators on Rooting of Potentilla fruticosa L.
Ko, Jae-Young ; Kwon, Hye-Jeong ; An, Myung-Hoon ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 463~467
This study was conducted to develop mass production method of Potentilla fruticosa L. for a commercial use. Effects of proper cutting time, and type and concentrations of plant growth regulators on the rooting were examined. When Potentilla fruticosa L. was cut on April 16th, average number of roots was 4.2, the number of shoots was 5.3 and the root production rate was 85%. By soaking in 1,000 ㎎ㆍℓ⁻¹ of IBA solution for 1 hour, the number of roots was 36.8, fresh weight was 780 ㎎ per cutting, and rooting rate was 95%. Cuttings were dipped in three rooting promoters, three concentrations and three dipping periods in early July. Soaking of cutting in 2,000 ㎎ㆍℓ⁻¹ of IBA solution for 30 seconds resulted in 15.2 roots, 600 ㎎ fresh weight per cutting, and 98% of rooting rate. For the treatment of IBA 4,000 ㎎ㆍℓ⁻¹ solution for ten minutes, the number of roots was 16.5, fresh weight was 710 ㎎ per cutting, and rooting rate was 100%.
Damage Status of Poinsettia by the Fungus Gnat (Bradysia difformis) and Its Control with Predatory Mite (Hypoaspis aculeifer)
Jeon, Heung-Yong ; Kim, Hyeong-Hwan ; Jung, Jae-A ; Kang, Taek-Jun ; Yang, Chang-Yul ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 468~473
Damage of poinsettia seedlings by the fungus gnat Bradysia difformis and control effect of the predatory mite Hypoaspis aculeifer against the fungus gnat were investigated in poinsettia propagation houses. Damage of plant seedlings by B. difformis were occured mainly within 30 days after poinsettia cutting, and seedling mortalities ranged from 12.4 to 19.6%. Daily predation rates of nymph and adult H. aculeifer were 1.8 to 5.1 and 2.3 to 5.4 larvae of fungus gnat, respectively. Control effect of H. aculeifer against B. difformis was increased by the additional treatment of H. aculeifer. Control efficacies were 83.2, 97.8 and 100% when H. aculeifer were inoculated one, two and three times, respectively. The survival rates, control efficacies of H. aculeifer against B. difformis and mortalities of poinsettia seedlings by B. difformis were significantly different by treatments of H. aculeifer after poinsettia cuttings. The control effects of H. aculeifer were higher, when H. aculeifer were inoculated in 7 days than in 14 days after poinsettia cuttings. When H. aculeifer were inoculated 5, 10, and 20 individuals in each poinsettia seedling pot, control efficacies were 89.5, 94.4, and 100%, respectively. The survival rates of poinsettia seedlings were higher, when H. aculeifer were inoculated in 7 days (99.8 to 100%) than in 14 days (76.0 to 84.0) after poinsettia cuttings. H. aculeifer was proved to be a successful biological control agent of B. difformis in poinsettia propagation houses, because of its high predation rate and continuing controlling effect.
Effect of Horticultural Therapy Using the Floral Decoration Training on the Improvement of Occupational Performance Ability and Vocational Rehabilitation in Mentally Retarded
Lee, Sun-Ja ; Um, Su-Jin ; Song, Jong-Eun ; Son, Ki-Cheol ;
Korean Journal of Horticultural Science and Technology, volume 25, issue 4, 2007, Pages 474~484
In this study, we aim to identify the impact of professional horticultural therapy using the floral decoration training (FDT) program for mentally retarded students in the vocational rehabilitation and improvement of their occupational performance. For this purpose, the study was conducted twice, with phase Ⅰ for vocational adaptation training and phase Ⅱ for vocational rehabilitation. The subjects were 35 students from the special high school in Seoul in the control group and 33 in the treatment group in phase Ⅰ. In phase Ⅱ, 15 students were selected from the control group in phase Ⅰ, 15 students from the treatment group in phase Ⅰ and 15 normal students in the same age group. Phase Ⅰ was conducted from Oct. to Dec. 2006, which consisted of 12 terms once a week. Phase Ⅱ was composed of five terms from Jan. to Feb. 2007. The FDT program in phase Ⅰ involved making the bouquet, flower basket and centerpiece, whereas phase II involved the selection of the bouquet, flower basket and centerpiece (candle holder). The evaluation tools were parents' questionnaires, evaluation of occupational performance ability, life satisfaction inventory and horticultural therapy performance assessment (HTPA-psychological behavior part) in phase Ⅰ, whereas phase II referred to the scoring standard for the florist test. In accordance with the occupational performance ability before and after the FDT in phase Ⅰ, the control group showed a reduction of occupational performance level in all testing areas including the pre-vocational skill, vocational attitude and total occupational performance level. On the contrary, the treatment group demonstrated statistically significant improvement in all areas, such as prevocational skill, vocational attitude and total occupational performance ability. In accordance with the horticultural activity performance ability test after the FDT, the treatment group indicated statistically significant improvements in the sub-groups, except in dependency factors, such as shrinking, participation, interest and pleasure, troublesome behavior, emotional insecurity and frustration. According to the results of the FDT in phaseⅡ, the averages were higher in normal students, followed by the treatment group and control group in that order in all areas including organization, color, creativity and technical ability. Furthermore, for the difference between the control group and treatment group that were comprised of mentally retarded students by area, the treatment group demonstrated higher average values than the control group in the areas of bouquet, flower basket, centerpiece and centerpiece using candle holder. As a result, the horticultural therapy program using the FDT had a positive impact on occupational adaptation and vocational rehabilitation by improving the occupational performance ability of mentally retarded students. Although it is importantfor them to directly get a job, as the completion of the occupational adaptation training and vocational rehabilitation training is considered as a kind of vocational rehabilitation, the programs used in this study will be effective for the vocational rehabilitation of mentally retarded individuals.