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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Journal of Agricultural Science
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Journal DOI :
CNU Journal of Agricultural Science
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Volume & Issues
Volume 40, Issue 4 - Dec 2013
Volume 40, Issue 3 - Sep 2013
Volume 40, Issue 2 - Jun 2013
Volume 40, Issue 1 - Mar 2013
Selecting the target year
Effects of ethephon and aminoethoxyvinylglycine on fruit quality and incidence of physiological disorders during simulated exportation environment in 'Wonhwang' pears
Choi, Jin-Ho ; Lee, Ug-Yong ; Ahn, Young-Jik ; Hwang, Yong-Soo ; Chun, Jong-Pil ;
Korean Journal of Agricultural Science, volume 40, issue 2, 2013, Pages 79~86
DOI : 10.7744/cnujas.2013.40.2.079
We investigate the effect of preharvest spray of aminoethoxyvinylglycine (AVG), an inhibitor of ACC synthase activity, on fruit quality of 'Wonhwang' pear (Pyrus pyrifolia Nakai). And the effects were compared with ethephon which releasing ethylene to elucidate treatment efficacy of ethylene biosynthesis inhibitor on Asian pears. Chemicals were sprayed on 30 days before harvest with AVG (75 and 150 mg/L) and ethephon (100 mg/L), respectively. Highest flesh firmness during 21 days of shelf-life at
after 30 days of cold storage was attained in the fruit treated with 150 mg/L AVG (26.5N) when compared with untreated control (16.7N), while the fruits treated with 100 mg/L ethephon completely lost their marketability within 14 days of shelf-life by mass drop of firmness down to 11.6N. Low incidence of physiological disorders including pithiness and core browning were attained at the fruits treated with 150 mg/L AVG when we compared with untreated control. No occurrence of mealiness found in the fruits treated with AVG but ethephon treated fruits showed 36.4% during 14 days of shelf-life. Consequently, AVG spray at the concentration of 150mg/L on Asian pear 'Wonhwang' fruit regarded as useful preharvest management approach for keeping quality during marketing period after simulated exportation.
XVIII. Study on Waxy Corn Characteristics of corn hybrids on second cropping of using green house
Na, Woong-Hyun ; Bok, Tae-Gyu ; Ko, Hyuck-Soo ; Paik, Seung-Woo ; Jo, Yang-Hee ; Lee, Hee-Bong ;
Korean Journal of Agricultural Science, volume 40, issue 2, 2013, Pages 87~91
DOI : 10.7744/cnujas.2013.40.2.087
The major characteristics of the developed corn hybrids were compared at each different planting time; 1st time(April 28) and 2nd time(August 20), respectively. Among traits surveyed, stem height showed highly at 1st time than 2nd, while ear height, stem diameter and ear length were similar at two times. Sugar content of the used hybrids showed highly at 2nd planting time than 1st. Pericarp thickness was also high at 2nd planting time. Especially, among hybrids CNU99 was the highest in stem height and ear length, CNU11 and CNU56 were high in sugar content, and CNU51 and CNU124 were thiner than other hybrids in pericarp thickness. Accordingly, these hybrids will be planted and recognized in 2nd yield trial for superior corn hybrid selection.
The pests survey of paprika export complexes and packing house in Korea
Kim, Gi-Don ; Lee, Siwon ; Kang, Eun-Ha ; Shin, Yong-Gil ; Jeon, Jae-Yong ; Heo, Noh-Yeol ; Lee, Heung-Sik ;
Korean Journal of Agricultural Science, volume 40, issue 2, 2013, Pages 93~99
DOI : 10.7744/cnujas.2013.40.2.093
The disease and insect were surveyed locally in greenhouse, fruit packing house and store house of 51 farms in 13 towns having purpose of paprika exportation. By analysis, various disease and insect were not only founded locally but more ones detected in farms having old facilities and no natural enemy. We found 15 pathogens such as Fusarium spp., Alternaria solani, Leveilluila taurica, PepMV (Pepino mosaic virus) and TMV (Tobacco mosaic virus) in greenhouse, Fusarium spp. in fruit packing house and Penicillium spp. in store house. We found 15 insects in greenhouse such as Bemisia tabaci, rialeurodes vaporariorum and Myzus persicae in greenhouse, Hylobitelus haroldi in fruit packing house. However, the problem quarantine disease and insect for importation and exportation were not detected in inspection time.
The major plant-parasitic nematodes in plastic vinyl house field
Kim, Sae-Hee ; Park, Sang-Eun ; Ko, Na-Yeon ; Ryu, Tae-Hee ; Shin, Heo-Seob ; Kwon, Hye-Ri ; Seo, Mi-Ja ; Yu, Yong-Man ; Youn, Young-Nam ;
Korean Journal of Agricultural Science, volume 40, issue 2, 2013, Pages 101~106
DOI : 10.7744/cnujas.2013.40.2.101
To know how much damages occurred by nematodes in plastic vinyl house field, soil samples were collected from strawberry cultivation areas at Buyeo and Nonsan in Chungnam and Jinju in Kyeongnam, melon cultivation area at Gocksung in Junnam and cucumber field at Gongju in Chungnam. And then, nematode samples were separated from each soil sample, and identified the kind of plant-parasitic nematodes. Plant-parasitic nematodes were separated from 52 soil samples. Among samples, Meloidogyne spp., Pratylenchus spp. and Helicotylenchus spp. were isolated from 45 (86.5%%) and 33 (63.5%) and 47 collected soil samples (90.4%), respectively. As a result of identification of plant-parasitic nematodes from regional collected soil samples, distribution of Helicotylenchus spp. was higher than any other plant-parasitic nematode. And the population of Meloidogyne spp. and Pratylenchu spp. were also higher, and a occurrence ratio of Meloidogyne spp. is higher than Pratylenchu spp. except the cucumber growing area at Gongju.
Effects of fruit bags and bagging time on fruit quality indices at harvest time in 'Wonhwang' and 'Whasan' pears
Jung, Ok-Kun ; Lee, Ug-Yong ; Ahn, Young-Jik ; Lee, Hyuk-Jae ; Hwang, Yong-Soo ; Chun, Jong-Pil ;
Korean Journal of Agricultural Science, volume 40, issue 2, 2013, Pages 107~113
DOI : 10.7744/cnujas.2013.40.2.107
We tested fruits quality and skin coloration of two pear cultivar 'Wonhwang' and 'Whasan' produced by bagging with different kinds of paper bags in the Cheonan area, Chungnam Province, Korea. The fruits were bagged at 35, 45, 55 or 65 days after full bloom (DAFB) with 3 kinds of double layer paper bag which consisted of grey color, yellow color and newspaper for outer layer. The great extent of light interruption was observed in grey colored outer paperbag among three kinds of paperbag which showed only 0.46% of lowest light transmittance when compared with 43.7% and 40.0% of yellow paper and newspaper, respectively. The development of skin redness (
) increased with the delay of bagging time in two pear cultivars. But the fruits treated at 65 DAFB showed uneven coloration and excessive development of redness which represented low fruit external appearance value. Uniform flesh firmness was attained at the fruits bagged with grey outer color paperbag regardless of bagging time, although the fruit quality indices including soluble solids and titratable acidity did not change significantly by using different kind of fruit bags and bagging time in two pear cultivar. Based on our results, it was explained that the grey-colored fruit bag had positive effect on the development of skin coloration without any detrimental effect on fruit quality factors in 'Wonhwang' and 'Whasan' pears.
SCAR markers were developed to identify zoysiagrass mutants exhibiting fine leaf characteristics
Chung, Sung Jin ; Park, Su Jeong ; Choi, Young In ; Kim, In-Kyung ; Lee, Ka-Yeon ; Kim, Hun-Joong ; Lee, Geung-Joo ;
Korean Journal of Agricultural Science, volume 40, issue 2, 2013, Pages 115~121
DOI : 10.7744/cnujas.2013.40.2.115
Polymorphic bands of two fine-leaf zoysiagrass mutants (CNU 70-1, CNU 70-2) induced via a gamma-ray irradiation on seeds of Zoysia japonica were obtained by using randomly amplified polymorphic DNA (RAPD) primers. The genotype-specific fragments were then converted into PCR-based sequence characterized amplified region (SCAR) markers, which are now amenable to detecting them among other zoysiagrass species widely noticeable in Korea. The CNU 70-1-specific primer set amplified about 900 bp successfully, while the CNU 70-6 marker produced the expected 1,500 bp band, by which those markers were nominated by CNU 70-1_900 and CNU 70-6_1500 SCARs, respectively. The developed SCAR markers can be an applicable tool in sod industry where illegal appropriation hampers breeder's right and profits due to the turfgrass plant vegetatively propagating.
Effects of supplementation of urea-molasses multinutrient block (UMMB) on the performance of dairy cows fed good quality forage based diets with rice straw as a night feeding
Jayawickrama, Dona R. ; Weerasinghe, Piyatilak B. ; Jayasena, Dinesh D. ; Mudannayake, Deshani C. ;
Korean Journal of Agricultural Science, volume 40, issue 2, 2013, Pages 123~129
DOI : 10.7744/cnujas.2013.40.2.123
An experiment was conducted to evaluate the effects of nitrogen supplementation through urea-molasses multinutrient block (UMMB) on the performance of dairy cows fed good quality forage based diets with rice straw as a night feeding. A total of 10 multiparous crossbred dairy cows in their early lactation were grouped into two categories based on their breed, parity, body weight, milk yield, milk fat and protein contents and daily fed a chopped CO-3 grass (Pennisetum purpureum
Pennisetum americanum; hybrid Napier) ad-libitum, 1 kg of dairy cow concentrate feed during the day time and 5 kg of rice straw (dry matter basis) at night as the basal diet (control) for 5 wk. In addition to the basal diet, the treatment group received 300 g of crushed UMMB daily throughout the experimental period. Cows were milked twice daily and the milk yields were recorded. Milk and feed samples were collected weekly for chemical analysis. Supplementation of UMMB had no significant effects (p>0.05) on straw intake, daily milk yield, contents and yields of milk constituents such as milk fat, protein, lactose and solids-non-fat. In addition, milk urea nitrogen content were not affected (p>0.05) by UMMB supplementation. However, numerical increments in all the parameters measured were observed during the study in cows fed diets supplemented with UMMB. It can be concluded that nitrogen supplied through UMMB had no effects on production performances of dairy cows in this study.
The effect of citrus and onion peel extracts, calcium lactate, and phosvitin on microbial quality of seasoned chicken breast meat
Alahakoon, Amali U. ; Bae, Young Sik ; Kim, Hyun Joo ; Jung, Samooel ; Jayasena, Dinesh D. ; Yong, Hae In ; Kim, Sun Hyo ; Jo, Cheorun ;
Korean Journal of Agricultural Science, volume 40, issue 2, 2013, Pages 131~137
DOI : 10.7744/cnujas.2013.40.2.131
The inhibitory effect of citrus peel extract, onion peel extract, calcium lactate and phosvitin on microbial growth was investigated in seasoned chicken breast meat during aerobic storage at
. Citrus peel and onion peel extract significantly improved (p<0.05) the microbial quality of the sample by reducing the initial counts of the microbial flora compared to control and other two treatments. Data clearly revealed that the counts of the total aerobic bacteria significantly increased with the increase in storage temperature. The shelf life of all samples stored under
was less than 6 days, while the shelf life of citrus and onion treatment can be extended more than 9 days at
and more than 6 days at
in aerobic storage condition. These results indicated that citrus and onion peel extracts are efficient treatment methods to prevent microbial spoilage of seasoned chicken products during storage at
. However, there was an adverse effect of addition of citrus and onion peel extract on several sensory attributes which need to be improved by reformulation of seasoning.
Rapid Detection Kit for Staphylococcus aureus
Kim, Gi-Young ; Park, Saet-Byeol ; Moon, Ji-Hea ; Lee, Sang-Dae ; Lee, Sea-Rom ; Jang, Youn-Jung ;
Korean Journal of Agricultural Science, volume 40, issue 2, 2013, Pages 139~146
DOI : 10.7744/cnujas.2013.40.2.139
This study was performed to develop a rapid test kit for pathogenic Staphylococcus in various samples. The rapid detection kit has been fabricated based on nitrocellulose lateral-flow strip. Colloidal gold and Staphylococcus antibodies were used as a tag and a receptor, respectively. Manually spotted Staphylococcus antibody and anti-mouse antibody on the surface of nitrocellulose membrane were used as test and control lines, respectively. Feasibility of the rapid kit to detect Staphylococcus aureus in samples were evaluated. The intensity of the color of the test line started to increase with the samples in which higher concentration of the cells were contained. The sensitivity of the sensor was
cfu/mL Staphylococcus spiked in PBS. Also, the rapid test kit could detect
cfu/mL of Staphylococcus in chicken meat extract.
Diversity of Calpain-Calpastatin gene frequencies in Brown, Brindle and Jeju Black Hanwoo
Lee, Seung-Hwan ; Kim, Seung-Chang ; Cho, Soo-Hyun ; Choi, Bong-Hwan ; Sharma, A. ; Lim, Dajeong ; Dang, Chang-Gwan ; Chang, Sun-Sik ; Kim, Jae-Hwan ; Ko, Moon Suk ; Yang, Boh-Suck ; Kang, Hee-Sul ;
Korean Journal of Agricultural Science, volume 40, issue 2, 2013, Pages 147~153
DOI : 10.7744/cnujas.2013.40.2.147
The aim of study was to investigate genetic diversity for the calpain/calpastatin gene in three Hanwoo breeds [(Brown (n=62), Brindle (n=81) and Jeju Black (n=30)]. Random samples from three breeds of Hanwoo were selected and genotyped for the 7 SNPs of calpain/calpastatin using TaqMan method. Allele frequencies were investigated for CAPN1/CAST gene. Allele frequency of CAST2 SNP was 0.75, 0.59 and 0.22 for Brown, Brindle and Jeju black, respectively. The CAST3 revealed allele frequency of 0.59 and 0.57 in Brown and Jeju Black, while it showed very low allele frequency (0.07) in Brindle. In particular, favorable allele (G allele) for the CAPN1-2 SNP which was shown a strong association with tenderness in Taurine and Indicine cattle revealed 16% and 17% higher allele frequency in Brown Hanwoo (0.82) comparing Brindle (0.66) and Jeju Black Hanwoo (0.65). AMOVA demonstrated that among population variance occupied only 10% of total variance and among individual variance was 0%, while within individual variance was 90% of total variance. This result showed that population effect contributed very small portion of genetic to these three Hanwoo breeds, while within individual variance contributed large portion of genetic diversity within these Hanwoo breeds. In conclusion, three Hanwoo breeds (Brown, Brindle and Jeju black) showed a genetically homogeneous based on the 7 SNPs of CAPN1/CAST gene and it came from same ancestor to form modern Hanwoo breed.
Genome wide association test to identity QTL for dressing percentage in Hanwoo
Lee, Seung Hwan ; Lim, Dajeong ; Dang, Chang Gwan ; Chang, Sun Sik ; Kim, Hyeong Cheul ; Jeon, Gi Jun ; Yeon, Seong Hum ; Jang, Gul Won ; Park, Eung Woo ; Oh, Jae Don ; Lee, Hak Kyo ; Lee, Jun Heon ; Kang, Hee Sul ; Yoon, Duhak ;
Korean Journal of Agricultural Science, volume 40, issue 2, 2013, Pages 155~162
DOI : 10.7744/cnujas.2013.40.2.155
Genome-wide association study was performed on data from 266 Hanwoo steers derived from 66 sire using bovine 10K mapping chip in Hanwoo (Korean Cattle). SNPs were excluded from the analysis if they failed in over 5% of the genotypes, had median GC scores below 0.6, had GC scores under 0.6 in less than 90% of the samples, deviated in heterozygosity more than 3 standard deviations from the other SNPs and were out of Hardy-Weinberg equilibrium for a cutoff p-value of
. Unmapped and SNPs on sex chromosomes were also excluded. A total of 4,522 SNPs were included in the analysis. To test an association between SNP and QTL, GWAS for five genetic mode (additive, dominant, overdominant, recessive and codominant) was implemented in this study. Three SNPs (rs29018694, ss46526851 and rs29018222) at a threshold p<
were detected on BTA12 and BTA21 for dressing percentages in codominant and recessive genetic mode. The G allele for rs29018694 has 4.9% higher dressing percentage than A allele, while the T allele for ss46526851 has 2.57 % higher dressing percentage than C allele. Therefore, rs29018694 SNP showed a bigger effect than the other two SNPs (ss46526851 and rs29018222) in this study. In conclusion, this study identifies three loci with moderate effects and many loci with infinitesimally small effect across genome in Hanwoo.
Comparison of optical reflectance spectrum at blade and vein parts of cabbage and kale leaves
Ngo, Viet-Duc ; Ryu, Dong-Ki ; Chung, Sun-Ok ; Park, Sang-Un ; Kim, Sun-Ju ; Park, Jong-Tae ;
Korean Journal of Agricultural Science, volume 40, issue 2, 2013, Pages 163~167
DOI : 10.7744/cnujas.2013.40.2.163
Objective of the study was to compare reflectance spectrum in the blade and the vein parts of cabbage and kale leaves. A total 6 cabbage and kale leaves were taken from a plant factory in Chungnam National University, Korea. Spectra data were collected with a UV/VIS/NIR spectrometer (model: USB2000, Ocean Optics, FL, USA) in the wavelength region of 190 - 1130 nm. Median filter smoothing method was selected to preprocess the obtained spectra data. We computed reflectance difference by subtraction of averaged spectrum from individual spectrum. To estimate correlation at different parts of cabbage and kale leaves, cross - correlation method was used. Differences between cabbage and kale leaves are clearly manifested in the green, red and near - infrared ranges. The percent reflectance of cabbage leaves in the NIR wavelength band was higher than that of kale leaves. Reflectance in the blade part was higher than in the vein part by 18%. Reflectance difference in the different parts of cabbage and kale leaves were clear in all of the wavelength bands. Standard deviation of reflectance difference in the vein part was greater for kale, while the value in the blade part was greater for cabbage leaves. Standard deviation of cross - correlation increased from 0.092 in the first sensor (UV/VIS) and 0.007 in the second sensor (NIR) to 0.099 and 0.015, respectively.
Investment beneficial analysis of rice alternative plants
Yi, Hyang-Mi ; Goh, Jong-Tae ; Lee, Jong-In ;
Korean Journal of Agricultural Science, volume 40, issue 2, 2013, Pages 169~176
DOI : 10.7744/cnujas.2013.40.2.169
The price and revenue of rice are expected to decrease due to increasing rice imports, decreasing consumption and the discontinuance of the government's rice procurement. This degenerating profitability is leading to a rise in the cultivation of upland-crops such as beans, fodder crops and fruits in paddy fields. However, there is a lack of research on the selection of rice substitute crops which are adaptable to the relevant region through profitability analysis. This research, therefore, analyzed investment profitability of rice substitute crops for Cheorwon-gun area in Kangwon province. The study applied net present value (NPV) and internal rate of return (IRR), which fit for mutually exclusive investments that make one selection to the exclusion of other crops. Target crops are green house plants in Cheorwon-gun area. Financial analysis showed paprika and cucumber have investment feasibility for automated vinyl greenhouses and conventional plastic greenhouses respectively.