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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Journal of Plant Resources
Journal Basic Information
Journal DOI :
The Plant Resources Society of Korea
Editor in Chief :
Volume & Issues
Volume 24, Issue 6 - Dec 2011
Volume 24, Issue 5 - Oct 2011
Volume 24, Issue 4 - Aug 2011
Volume 24, Issue 3 - Jun 2011
Volume 24, Issue 2 - Apr 2011
Volume 24, Issue 1 - Feb 2011
Selecting the target year
Effect of Medium Components and Culture Methods on Shoots Regeneration from Athyrium niponicum
Shin, So-Lim ; Lee, Cheol-Hee ;
Korean Journal of Plant Resources, volume 24, issue 2, 2011, Pages 113~120
DOI : 10.7732/kjpr.2011.24.2.113
Present studies are carried out to find media components and culture methods for in vitro propagation of Athyrium niponicum and to establish the optimal economic masspropagation systems. Among pinnae, petiole and rhizome segments only rhizome segments produced young plants. Rhizome segments showed vigorous plant regeneration on 1/2MS medium and supplement to 1% sucrose and 50
were promoted the plant regeneration from rhizome segments. Kinetin was better than BA for plant regeneration and combination with 2
kinetin and 5
IBA was most efficient for plant regeneration. Solid or liquid medium with or without 0.1% qactivated charcoal in modified 1/2MS medium (1% sucrose, 50
IBA, pH 5.8) were used to find the optimal culture methods. The plant regeneration from rhizome segments were most vigorous on solid medium without activated charcoal. The addition of activated charcoal were inhibited the plant regeneration from rhizome segments not only on solid medium but also liquid stationary or suspension culture.
Selection of Suitable Varieties of Carnation (Dianthus caryophyllus L.) and Optimization of Culture Conditions for Efficient Tissue Culture
Kang, Chan-Ho ; Han, Bum-So ; Han, So-Gon ; Kown, Sung-Hwan ; Song, Young-Ju ;
Korean Journal of Plant Resources, volume 24, issue 2, 2011, Pages 121~129
DOI : 10.7732/kjpr.2011.24.2.121
As the molecular breeding was progressed, many plant transformation techniques were attained for improving transformation accuracy and used to produce useful transgenic plants. Day by day, new varieties were developed so new transformation techniques required for these newly developed varieties. Carnation (Dianthus caryophyllus L.) is a popular and economically important ornamental plant, all over the world. Keeping this in view, we selected 18 varieties of D. caryophyllus L. commonly available in the market and did optimization of culture conditions for more efficient tissue culture and to get higher number of plants via micro-propagation. Four varieties namely Yellowdotcom, Jakarta, Belmonte, Polartessino etc. were selected for organ culture studies from single cell line. The optimum growth was recorded in the MS media supplied with sucrose 3%, NAA 1.0 mg/L and TDZ 1.0 mg/L. except Belmonte, in which, BA 1.0 mg/L was found to be the best combination, in place of TDZ, rest ingredients were same. The most efficient coagulating agent used to obtain higher number of plant from callus was phytagel 0.3%. The most effective explant for higher shoot formation was stem in which 80.2% shoot formation was recorded. It also reduced culture periods by 6 days.
Inhibitory Effect of Red Bean (Phaseolus angularis) Hot Water Extracts on Oxidative DNA and Cell Damage
Park, Young-Mi ; Jeong, Jin-Boo ; Seo, Joo-Hee ; Lim, Jae-Hwan ; Jeong, Hyung-Jin ; Seo, Eul-Won ;
Korean Journal of Plant Resources, volume 24, issue 2, 2011, Pages 130~138
DOI : 10.7732/kjpr.2011.24.2.130
In this study, we evaluated the protective effects of the hot water extract from red bean (Phaseolus angularis) against oxidative DNA and cell damage induced by hydroxyl radical. The antioxidant activities were evaluated by hydroxyl radical and hydrogen peroxide scavenging assay, and
-chelating assay. Although the extract with hot water didn't scavenge the hydroxyl radical, it removed and chelated hydrogen peroxide and ferrous iron necessary for the induction of hydroxyl radical by 71% and 64% at 200
, respectively. Its protective effect on oxidative DNA damage was carried using
X-174 RF I plasmid DNA comparing the conversion level of supercoiled form of the plasmid DNA into open-circular form and linear form and the expression level of phospho-H2AX in NIH 3T3 cells. In
X-174 RF I plasmid DNA cleavage assay, it inhibited oxidative DNA damage by 96% at 200
. Also, it decreased the expression of phospho-H2AX by 50.1% at 200
. Its protective effect against oxidative cell damage was measured by MTT assay and the expression level of p21 protein in NIH 3T3 cells. In MTT assay for the protective effect against the oxidative cell damage, it inhibited the oxidative cell death and the abnormal cell growth induced by hydroxyl radical. Also, it inhibited p21 protein expression by 98% at 200
. In conclusion, the results of the present studies indicate that hot water extract from red bean exhibits antioxidant properties and inhibit oxidative DNA damage and the cell death caused by hydroxyl radical.
Variation Analysis of Long-term in vitro Cultured Cymbidium goeringii Lindley and Cymbidium kanran Makino
Ryu, Jai-Hyunk ; Lee, Hyo-Yeon ; Bae, Chang-Hyu ;
Korean Journal of Plant Resources, volume 24, issue 2, 2011, Pages 139~149
DOI : 10.7732/kjpr.2011.24.2.139
RAPD (random amplified polymorphic DNA) analysis was examined to detect variation of in vitro cultured 30 rhizomes of Cymbidium goeringii Lindley and Cymbidium kanran Makino, with long-term (8 years) subculture, respectively. Out of 151 DNA bands detected, the 40 were polymorphic with a polymorphic rate 26.4% in the C. goeringii. Out of 155 DNA bands detected, the 56 were polymorphic with a polymorphic rate 36.1% in the C. kanran. Genetic similarity matrix (GSM) shows from 0.825 to 1.00 with an average of 0.944 in the rhizomes of C. goeringii and 0.812 to 1.00 with an average of 0.913 in the C. kanran. According to the clustering analysis, C. goeringii was divided into 1 group and 2 independent individuals and its structure of clustering was simple than that of C. kanran. The higher polymorphism and the decreased GSM were showed in the long-term in vitro cultured C. goeringii and C. kanran supplemented with growth regulators. The results provide as fundamental data to develop a new materials for plant breeding and resources plant.
Amino Acid Contents and Various Physiological Activities of Allium victorialis
Cho, Ja-Yong ; Park, Yun-Jum ; Oh, Dea-Min ; Rhyu, Dong-Young ; Kim, Young-Seon ; Chon, Sang-Uk ; Kang, Seong-Sun ; Heo, Buk-Gu ;
Korean Journal of Plant Resources, volume 24, issue 2, 2011, Pages 150~159
DOI : 10.7732/kjpr.2011.24.2.150
This study was conducted to gather the basic data on the alpine leek (Allium victorialis) for the expand of consumption and the production of its manufactured goods. Amino acid content in alpine leek leaves and various physiological activities were examined. Seventeen component amino acids and 38 free amino acids from alpine leek leaves were analyzed, and the total contents were 2,693.28 mg/100g for component amino acids and 535.39 mg/100g for free amino acids. Total phenolic compounds in the leaves of alpine leek showed the highest level from the methanol extract (37.7 mg/l), and followed by ethanol extract (31.9 mg/l) and hot water extract (25.4 mg/l). Total flavonoid contents in 1,000 mg/l extract was the highest in the methanol extract (22.2 mg/l). DPPH radical scavenging activity at 1,000 mg/l extract was high in the order of ethanol extract (51.6%), methanol extract (47.3%) and hot water extract (37.2%). nitrite radical scavenging activity Methanol extract from Allium victorialis leaves was the highest nitrite radical scavenging activity (79.5%). Hyperplasia suppression of lung cancer cells (Calu-6) and gastric cancer cells (SNU-601) by the methanol extract from the bulb of alpine leek were 99.9% in the extracting concentration of over 200 mg/l. No significant difference in antimicrobial activity among the 3 different solvents and extract concentrations was observed, and the inhibition zones against the gram-positive and negative microorganisms were ranged from 8.23 to 10.15 mm. It was concluded that physiological activities in a human body could be improved by the intake of alpine leek as a pharmaceutical material, and that it would be useful for the prevention of health risk such as lung and gastric cancers.
Annual Productivity and Adaptability of Growing Area in Shallot (Allium cepa var. ascalonicum Backer)
Cho, Yong-Cho ; Lee, Jong-Tae ; Park, Yoo-Gyeong ; Jeong, Byoung-Ryong ;
Korean Journal of Plant Resources, volume 24, issue 2, 2011, Pages 160~167
DOI : 10.7732/kjpr.2011.24.2.160
Shallot is a foreign crop introduced from France in 1995 as a new overwintering field crop with an aim to develop as 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 develop proper cultural methods based on annual productivity and adaptability of growing area to address and suggest solutions to some of these problems. Bulb weight was 18.7 g and bulb yield per 10a was 4,113 kg in 1995. In 1996, bulb weight increased to 25.8 g, while bulbs yield per 10a deceased to 2,013 kg. This trend continued in 1997 so that bulb weight increased, and yield per 10a decreased as compared to those in 1996. However, in 1998, both bulb weight (21.1 kg) and yield per 10a (1,246 kg) decreased significantly as compared to those of the previous years. Plant growth from planting to April in the coastal area was better than in other areas. However, the plant growth thereafter until early July was better in the semi-highland area. As a result, the bulb yield in the semi-highland area was 57% more than that in the lowland areas such as the coastal area.
Effect of Plant Growth Regulators and Media on Regeneration of Sorghum bicolor (L.) Moench
Goh, Eun-Jeong ; Seong, Eun-Soo ; Yoo, Ji-Hye ; Kil, Hyun-Young ; Lee, Jae-Geun ; Hwang, In-Seong ; Kim, Nam-Jun ; Ghimire, Bimal Kumar ; Kim, Myong-Jo ; Lee, Ju-Kyung ; Lim, Jung-Dae ; Kim, Na-Young ; Yu, Chang-Yeon ;
Korean Journal of Plant Resources, volume 24, issue 2, 2011, Pages 168~173
DOI : 10.7732/kjpr.2011.24.2.168
This study was carried out to optimize the embryogenic callus induction and plant regeneration from mature seeds of Sorghum bicolor. The effect of growth regulators was investigated on formation of embryogenic callus. The highest frequency of embryogenic callus was observed when the mature seeds were cultured on B5 medium supplemented with 2 mg/L 2,4-Dichlorophenoxyacetic acid (2,4-D). The highest frequency of plant regeneration from embryogenic callus was observed on MS medium with 0.5
6-benzyl amino purine (BAP) and 0.25
indole-3-butyric acid (IBA) to optimize the shoot regeneration. High concentration of BAP (1
) supplemented with IBA (0.25
) was effective combination for shoot multiplication. MS medium supplemented with 1
IBA was found to be the most effective for inducing roots. Normal rooted plantlets were transferred to the greenhouse for hardening with over 90% survival rate. Hence, this reproducible protocol could be useful for mass propagation and genetic transformation of S. bicolor.
Screening of Effective Extraction Conditions for Increasing Antioxidant Activities from Fronds of Osmunda japonica
Shin, So-Lim ; Lee, Cheol-Hee ;
Korean Journal of Plant Resources, volume 24, issue 2, 2011, Pages 174~180
DOI : 10.7732/kjpr.2011.24.2.174
This study was conducted to investigate the optimum condition of extraction from fronds of Osmunda japonica to increase antioxidant compounds and antioxidant activity. Powder (1 g) of lyophilized fronds were mixed with three different solvents (MeOH, 80% EtOH and water). Extraction was carried out using not only by immersion (room temp.), heating (
) and stirring (200 rpm) for 6 h, but also by sonication in 42 kHz ultrasonic bath for 15, 30 and 45 min. Extracts were filtered, and adjusted up to 50 mL to determine contents of soluble solids, total polyphenols and total flavonoids. Antioxidant capacity was measured by radical scavenging activity of 0.15 mM DPPH (2,2-diphenyl-1-picrylhydrazyl) and 7.4 mM ABTS [2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid)] radical. Among the solvents, MeOH and 80% EtOH appeared to be effective for extraction. Extract obtained from sonication in MeOH for 15 min resulted high polyphenol contents (45.15
db) and DPPH radical scavenging activity (
). The highest flavonoid contents was obtained from immersion or heating extraction with MeOH (38.10~38.10
db). ABTS radical scavenging was high in same extraction with 80% EtOH (
). Altogether, our results indicate that the extraction using ultrasonic bath with MeOH as a solvent (for 15~30 minutes) was the most effective way not only for increasing various antioxidant activities but also for saving labor and time in case of fronds of Osmunda japonica.
Effects of Foeniculi fructus Water Extracts on Activities of Key Enzymes of Lipid Metabolism Related with Obesity
Seo, Dong-Joo ; Kim, Tae-Hyuck ; Kim, Hyun-Sook ; Choe, Myeon ;
Korean Journal of Plant Resources, volume 24, issue 2, 2011, Pages 181~188
DOI : 10.7732/kjpr.2011.24.2.181
This study was carried out to estimate beneficial effects of Foeniculi fructus water extract on activities of key enzymes such as lipoprotein lipase (LPL), acyl-CoA synthetase (ACS), and hormone sensitive lipase (HSL) on lipid metabolism related with obesity. LPL and ACS were extracted from the epididymal adipose tissue and liver of C57BL/6J normal and obese mouse. Foeniculi fructus water extract treatment significantly reduced the activity of normal and obese LPL. When 100 ppm of Foeniculi fructus water extracts were tested, they decreased obese LPL activity by 12.0%. Foeniculi fructus water extract activated obese ACS activity by 7-fold compared with control at 1,000 ppm concentration. Expression of HSL mRNA was increased in Foeniculi fructus water extracts treated cells compared with non treated cells. All things considered, Foeniculi fructus water extract efficiently inhibits the influx of fatty acid into the cell, and activates metabolic process that uses fatty acids flowing as an energy source. Thus, it suggest that Foeniculi fructus water extract may have great potential as a novel anti-obesity agent.
Effect of Topping Time on Growth and Quality in Glycyrrhiza uralensis
Nam, Sang-Young ; Kim, In-Jae ; Choi, Seong-Yel ; Kim, Young-Ho ; Song, In-Gyu ; Lee, Guang-Jae ; Park, Jae-Ho ; Kim, Tae-Jung ;
Korean Journal of Plant Resources, volume 24, issue 2, 2011, Pages 189~194
DOI : 10.7732/kjpr.2011.24.2.189
This study was performed to evaluate the effect of pinching time on growth and quality of Glycyrrhiza uralensis soil cultured in Chungbuk Agricultural Research and Extension Service from 2008 to 2009. The treated pinching time were given as the June 30, July 30, August 30, and non-pinching (control). The amounts of pinching were 20% of stem length each plant. The obtained results from this study were summarized as follows; The plant height and number of branches were higher in control than pinching treatments. The stem and leaf weight were increase with early pinching. The plant height and stem diameter were not affected by pinching time. There was no regular trends in runner growth. We found that pinching was induced root growth, and early pinching was accelerated root growth. The root yield was increased in JUN and JUL pinching treatments as 11-30% in 2 years plants and 6-11% in 3 years plants compared to control as 238 kg/10a and 432 kg/10a, respectively.
Studies on Genetic Variation of Soluble Solids, Acidity and Carotenoid Contents in Tomato Fruits from Germplasm
Son, Cho-Yee ; Jung, Yu-Jin ; Lee, In-Hye ; Kyoung, Jung-Ho ; Lee, Jang-Su ; Kang, Kwon-Kyoo ;
Korean Journal of Plant Resources, volume 24, issue 2, 2011, Pages 195~199
DOI : 10.7732/kjpr.2011.24.2.195
Tomato (Lycopersicon esculentum M.) is one of the most important crops to the fresh vegetable market and the food processing industry. To evaluate genetic variation in tomato fruits, major characteristics such as soluble solids, acidity and carotenoid contents were analyzed for 771 genetic resource lines. Lines in red color was about 85% which is the largest one followed by peach color, yellow, green, orange, and black. The sweetness of juice ranged from 2.2 to 11.5% (in brix), the average being 5.6%. The acidity ranged from 0.124% to 1.665%, and the average was 0.881%. The lycopine contents was up to 80.4
, and 43.4
-carotine ranged 1.8 to 48.8
and it average was 10.8
. Statistical analysis indicates that there is coefficient of correlation between acidity and sweetness, acidity and pH, pH and lycopine, lycopine and
-carotine. It is expected that the result of this study can be used for breeding more competitive species with respect to contents in sugar or functional chemicals from the selected characteristic species.
Antioxidative and Antimicrobial Activities of Castanopsis cuspidata var. sieboldii Extracts
Kim, Ji-Young ; Yoon, Weon-Jung ; Yim, Eun-Young ; Park, Soo-Yeong ; Kim, Young-Ju ; Song, Gwan-Pil ;
Korean Journal of Plant Resources, volume 24, issue 2, 2011, Pages 200~207
DOI : 10.7732/kjpr.2011.24.2.200
This study was designed to investigate the possible utilization of Castanopsis cuspidata as a source of antiseptic agents. The leaves of C. cuspidata, extracted by 80% ethanol, were sequentially fractionated with n-hexane, dichloromethane, ethylacetate, and n-butanol. In order to effectively screen for a natural preservative agent, we first investigated the antioxidant activities such as DPPH radical scavenging capacity, superoxide radical scavenging capacity, and xanthine oxidase inhibitory activity of the C. cuspidata ethanol extracts and fraction. Using a screening system, we found that the ethylacetate fraction had the strongest antioxidant activity, which followed a dose-dependent manner. The antimicrobial activities were shown in the ethylacetate fraction of C. cuspidata. Among the five fractions, the ethylacetate fraction showed the highest antimicrobial activities against microorganisms tested, which were Bacillus sublitis, Listeria monocytogenes, Staphylococcus aureus, Escherichia coli, Salmonella enteritidis and Salmonella typhimurium. In addition, leaf extracts of C. cuspidata could be suitable for the development of food preservatives.
Medium Constituents for in vitro Multiplication of Chinese Yam (Dioscorea opposita Thunb.)
Jeong, Eun-Ah ; Kwon, Soon-Tae ;
Korean Journal of Plant Resources, volume 24, issue 2, 2011, Pages 208~213
DOI : 10.7732/kjpr.2011.24.2.208
This study was carried out to determine the effect of medium solidity, salt strength, sugar and nitrogen sources, and pH levels on in vitro multiplication of pathogen-free yam (Dioscorea opposita Thunb.). Liquid medium was more effective in the growth of plant height, fresh weight, and formation of microbulb than the solid medium. Optimal condition for plant fresh weight, growth, and multiplication axillary bud was in 1MS salt strength with 60
sucrose and half strength of
. Optimal condition for microbulb formation was
MS salt strength supplemented with glucose 60
and half strength of
. The number of leaves and nodes were sharply increased from 2 to 5 weeks, whereas plant fresh weight was steadily increased from 3 to 11 weeks after inoculation. Microbulbs were formed at 2 weeks after inoculation and continuously increased until 12 weeks.
The Vascular Plant Species in Sogwang-ri, Uljin-gun
Shin, Hyun-Tak ; Yi, Myung-Hoon ; Yoon, Jung-Won ;
Korean Journal of Plant Resources, volume 24, issue 2, 2011, Pages 214~235
DOI : 10.7732/kjpr.2011.24.2.214
The field survey to investigate the flora in Sogwang-ri, Uljin-gun, was carried out 10 times, from April 2009 to September 2010, and The results summarized as 430 taxa, 89 families, 253 genera, 367 species, 3 subspecies, 53 varieties, and 7 forms. Among these, 13 taxa were recorded as Korean endemic plant species and 11 taxa as rare plant species, which applied by the Korean Forest Service. Furthermore, 54 taxa were listed as specific plant species based on phytogeographical points of view and based on the list of those plants approved for delivery overseas, 17 taxa were recorded as such in the investigated area. There were 15 taxa identified as naturalized plants, and their naturalization ratio was found to be 3.4%. Among the 430 taxa, 178 taxa (40.9%) were categorized as edible plants, 145 taxa (33.7%) as medicinal plants, 114 taxa (26.5%) as pasture plants, 63 taxa (14.6%) as ornamental plants, 15 taxa (3.4%) as timber plants, 11 taxa (2.5%) as fiber plants, and 4 taxa (0.9%) as industrial plants.
The Analysis of the Physiologic Activities of the Jeju Teas according to the Fermentational Degree
Park, Shin-Young ; Lee, Sun-Joo ;
Korean Journal of Plant Resources, volume 24, issue 2, 2011, Pages 236~242
DOI : 10.7732/kjpr.2011.24.2.236
In this present study, we investigated the anti-oxidant activity, the inhibition ability of lipid peroxidation, and the protective effect of cow pulmonary epithelium (CPAE) cells under oxidative stress using green tea and 3 types of fermented teas of Jeju Island. To compare the physiological activity of non-fermented and 3 types of fermented teas, the fermented time was controlled with 0 hr. (non fermented tea, G), 12 hrs. (20% fermented tea, F20), 17 hrs. (50% fermented tea, F50) and 24 hrs. (80% fermented tea, F80), respectively. Scavenging ability on DPPH radicals of 80
concentration of F20 was similar to that of 50
epigallocatechin gallate (EGCG) but it was stronger than those of G, F50 and F80. All extracts tested inhibited LDL oxidation but G and F20 inhibited LDL oxidation 25~30% more than F50 and F80 at 40
concentration which was similar to that of 50
EGCG. We observed that the CPAE cells treated with the tea extracts had a significant increase in cell viability, especially the cells under oxidative stress with 1 mM
as compared with the control group (no treatment with tea extracts). These findings suggested that all tea extracts containing fermented tea had a protective effect on oxidative stressed CPAE cells through their free radical scavenging activity. It can be concluded that F20 extracted from 20% fermented tea has the most significant antioxidative effects that inhibit lipid peroxidation and protect the CPAE cells under oxidative stress.
Effect of Composts Fermented with Korean Medicinal Herb Wastes on Physiological Activity of Rubus coreanus Miquel (Bokbunja)
Kim, Seong-Jo ; Kim, Jae-Young ; Baek, Seung-Hwa ;
Korean Journal of Plant Resources, volume 24, issue 2, 2011, Pages 243~252
DOI : 10.7732/kjpr.2011.24.2.243
Fermented compost made from medicinal herb wastes (MHWC) as an environment-friendly manure resource was applied to determine physiological activities of Rubus coreanus Miquel (Bokbunja). MHWC, poultry manure compost (PMC), and MHWC+PMC (1:1, w/w) were applied to 2 year-old Bokbunja plant at levels of 0, 20, 40 Mg/ha, respectively. Physiological activities of Bokbunja were investigated at 15, 20 and 25 days after flowering (DAF). Content of total phenolics in fruit was high in order of 25 > 20 > 15 DAF, showing highest value in fruit treated with MHWC at 40 Mg/ha. The flavonoid level showed same pattern to total phenolics. Electron donation abilities at fruits at 15 and 20 DAF were higher than at 25 DAF. Nitrite scavenging ability (NSA) was increased on in order of pH 1.2 > 4.2 > 6.0. NSA in fruit at 15 and 20 DAF was higher than at 25 DAF. Tyrosinase inhibition ability at fruits treated with MHWC showed the highest value among all composts. Xanthine oxidase inhibition ability in fruit treated with MHWC at 25 DAF was the highest. In conclusion, physiological activities of Rubus coreanus Miquel (Bokbunja) were improved in MHWC group.
Comparison of Antioxidant Effects of Different Korean Pear Species
Lee, Cheol-Hee ; Shin, So-Lim ; Kim, Na-Rae ; Hwang, Ju-Kwang ;
Korean Journal of Plant Resources, volume 24, issue 2, 2011, Pages 253~259
DOI : 10.7732/kjpr.2011.24.2.253
In this studies, contents and activities of antioxidative substances in the fruits of a pear cultivar and five Korean wild pear lines were investigated. The content of total phenolic compounds was highest with Pyrus pyrifolia var. culta "Shingo" (7.68
, D.W.) while total flavonoids was highest with P. ussuriensis var. acidula (5.66
, D.W.). The contents of total polyphenols and flavonoids varied according to plant species, but in general pyrifolia lines had higher total polyphenols than total flavonoids whereas in ussuriensis lines total flavonoid contents were higher than total polyphenols. The scavenging effects of DDPH radicals was highest with highest with P. ussuriensis var. seoulensis (
) and that of ABTS radicals was highest with P. ussuriensis var. acidula (
). A pear cultivar "Shingo" showed highest total polyphenol content, but scavenging activity of DDPH and ABTS radicals was lowest. The fruits of P. ussuriensis var. seoulensis contained low level of phenolic compounds, but their scavenging effects on two radicals was superior. Ferrous ion chelating effect was high in P. pyrifolia var. culta (98.93%), and in P. ussuriensis var. sinensis (68.71%), but two species had low scavenging activity. The content of phenolic compounds in wild pears was not always directly proportional to the radical scavenging activity. Neither radical scavenging activity was to ferrous ion chelating activity. In conclusion the fruits of P. ussuriensis var. acidula, P. ussuriensis var. seoulensis, and P. ussuriensis var. sinensis had great potential for the development of new antioxidative functional food because their antioxidative activity is higher or at least similar to P. pyrifolia var. culta. However, due to their different levels of antioxidative effects, the development of methods of using them jointly, not singly, to obtain maximum level of antioxidants is recommended.
Study on Transplanting Cultural Methods of Turf Seedling VI. Depression Effect of Biennial Weed Species as Mowing Height
Lee, Myung-Sun ;
Korean Journal of Plant Resources, volume 24, issue 2, 2011, Pages 260~266
DOI : 10.7732/kjpr.2011.24.2.260
This study was carried out to control biennial weed which gives a lot of damage to landscaped and early growth of lawns in early spring. The results obtained from the mowing experiment are as follows. (1) Average of occurrence rate of weed species of the total treatments was 17.9%, (2) Occurrence rate of weed species was as 24.7% at 12.5 mm low mowing section. The rate indicates that the lowest weed depression effect was appeared at the lowest mowing among 4 mowing sections. (3) Occurrence rate of weed species was 10.6% at 22.5 mm mowing section. The highest weed depression effect among the 4 mowing sections was observed at the 22.5 mm mowing section. (4) Occurrence rates of weed species were 18.2% and 18.3% at 32.5 mm and 42.5 mm high mowing section, respectively.