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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Journal of Agricultural Science
Journal Basic Information
Journal DOI :
CNU Journal of Agricultural Science
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Volume & Issues
Volume 41, Issue 4 - Dec 2014
Volume 41, Issue 3 - Sep 2014
Volume 41, Issue 2 - Jun 2014
Volume 41, Issue 1 - Mar 2014
Selecting the target year
Mapping QTL for ratooning ability in advanced backcross lines from an Oryza sativa × O. rufipogon cross
Ji, Shi-Dong ; Luo, Xiao ; Ahn, Sang-Nag ;
Korean Journal of Agricultural Science, volume 41, issue 1, 2014, Pages 1~7
DOI : 10.7744/cnujas.2014.41.1.001
Ratooning ability is one of the major different traits from perennial to cultivated rice and annual type. We developed a set of 126 introgression lines derived from a cross between Hwayeong and W1944 (O. rufipogon) to gain an insight into the genetic factors underlying differences between common wild rice and cultivated rice. One IL, CR6 among the 126 ILs of
showed a significant difference in rationing ability compared with Hwayeong. To further characterize the rationing ability, CR6 was selected and crossed to Hwayeong to produce three secondary populations,
. In the Hwayeong background, the W1944 allele was associated with an increase in rationing ability. QTL analysis showed that the qRAT5 for rationing ability was linked to RM194 (
=6.6%, 19.6%, and 44.5% in the
, respectively). The putative qRAT5 was also tightly linked to QTLs for spikelets per panicle and grain weight indicating that this region harbors a QTL cluster related to domestication. To our knowledge, this is the first report to map the major QTL for ratooning ability in rice. The SSR markers linked to qRAT5 would be useful in marker-assisted selection for breeding lines with enhanced ratooning ability.
Effects of short-term treatment of high pressure CO
on the changes in fruit quality during the storage of 'Maehyang' strawberries
Ahn, Sun-Eun ; Wang, Mao-Hua ; Lee, Ah-Youn ; Hwang, Yong-Soo ;
Korean Journal of Agricultural Science, volume 41, issue 1, 2014, Pages 9~16
DOI : 10.7744/cnujas.2014.41.1.009
This experiment was conducted to examine the effects of a short-term treatment of high pressure
on shelf-life of strawberry fruit. A short-term treatment (12 hr) of 100%
resulted in the increase of fruit firmness up to 71.9% compared to that at harvest. The firmness of
treated fruit remained a significantly higher than that of control (air) up to 15 days. The alteration of pectic polymers was observed by
treatment such as an increase of EDTA soluble pectins and decrease of water soluble ones. The
treatment resulted in the increase of total amount of wall bound calcium. Pectate lyase activity, an important agent of strawberry fruit softening, was also significantly reduced by
treatment. Contents of soluble solids and acids of
treated fruit were higher than those of control fruit. Short-term treatment of high pressure
affected shelf-life through firmness increase whereas the visual quality and decay incidence of strawberry fruit were not affected.
Herbicidal efficacy of various formulations and application timings of imazosulfuron+fentrazamide mixtures in rice
Kang, Kwang Sik ; Won, Ok Jae ; Park, Su Hyuk ; Eom, Min Yong ; Hwang, Ki Seon ; Suh, Su Jeong ; Pyon, Jong Yeong ; Park, Kee Woong ;
Korean Journal of Agricultural Science, volume 41, issue 1, 2014, Pages 17~22
DOI : 10.7744/cnujas.2014.41.1.017
This study was conducted to evaluate the efficacy of formulations and application timings of imazosulfuron+fentrazamide in rice field. Weeding efficacy of imazosulfuron+fentrazamide SC (75+300 g a.i./ha) was more than 95% except Bidens tripartita. The efficacy of this formulation was not related to its formulations but was highly related to application timing. Herbicide application before 5 days after transplanting was best timing to get a maximum weed control. Systemic application before and after transplanting was much higher than single application for weed control. Second leaf stage of Echinochloa spp. and sulfonylurea resistant Monochoria vaginalis was controled over 90% in the imazosulfuron+fentrazamide SC (75+300 g a.i./ha). Based on these data, imazosulfuron+fentrazamide can be applied to provide effective weed control especially in the field infested with herbicide resistant M. vaginalis.
Development of customized control modules for the model forecasting the occurrence of potato late blight
Shim, Myung Syun ; Lim, Jin Hee ; Kim, Jeom-Soon ; Yoo, Seong Joon ;
Korean Journal of Agricultural Science, volume 41, issue 1, 2014, Pages 23~27
DOI : 10.7744/cnujas.2014.41.1.023
Potato late blight occurrence is caused by various environmental factors, and the progress can be regularly predicted so that several predictive models have been developed. The models predict the timing of the disease occurrence, but they do not include the methods of the disease control. Effective fungicide control, economic threshold, prediction models were investigated in the study to reflect on customized control modules for the model forecasting the occurrence of potato late blight.
Development of customized control modules for the model forecasting the occurrence of phytophthora blight on hot pepper
Shim, Myung Syun ; Lim, Jin Hee ; Kim, Jeom-Soon ; Yoo, Seong Joon ;
Korean Journal of Agricultural Science, volume 41, issue 1, 2014, Pages 29~34
DOI : 10.7744/cnujas.2014.41.1.029
Phytophthora blight occurrence is caused by various environmental factors, and the progress can be regularly predicted so that several predictive models have been developed. The models predict the timing of the disease occurrence, but they do not include the methods of the disease control. Effective fungicide control, control threshold, prediction models were investigated in the study to reflect on customized control modules for the model forecasting the occurrence of Phytophthora blight on hot pepper.
Evaluation of Salmonella cross contamination at retail chicken meat outlets in Kandy, Sri Lanka
Alwis, Upeksha S. ; Mudannayake, Deshani C. ; Jayasena, Dinesh D. ; Ubeyarathna, Kamalika J.H. ;
Korean Journal of Agricultural Science, volume 41, issue 1, 2014, Pages 35~40
DOI : 10.7744/cnujas.2014.41.1.035
This study was carried out to evaluate the Salmonella cross contamination at retail chicken meat outlets in Kandy, Sri Lanka and to identify the risk factors for Salmonella contamination at retail chicken meat outlets. Fifteen retail chicken meat outlets in Kandy area were randomly selected. Pre-tested questionnaires were used to collect data for identifying risk factors of Salmonella cross contamination at retail outlets and swab samples from meat contact surfaces/utensils were obtained. Out of 57 swab samples collected from meat contact surfaces/utensils, the overall prevalence of Salmonella cross contamination was 21%. Weighing scale (33%), meat containing trays/buckets (27%) and cutting board (25%) showed the highest percentage of Salmonella prevalence whereas knife and showcase showed relatively low percentages, 14% and 9%, respectively. Retail chicken outlets with slaughtering facilities had a significantly higher prevalence of Salmonella cross contamination than those without slaughtering facilities. This higher rate of Salmonella cross contamination at retail chicken meat outlets could be attributed to lack of proper cold chains and minimal facilities, and poor level of hygiene in those outlets.
Inbreeding levels and effective population size of duroc populations of major swine breeding farms in Korea
Hong, Joon Ki ; Song, Na Rae ; Kim, Du Wan ; Kim, Si Dong ; Kim, Young Hwa ; Choi, Jae Gwan ; Mun, Hyo Sik ; Cho, Kyu Ho ;
Korean Journal of Agricultural Science, volume 41, issue 1, 2014, Pages 41~46
DOI : 10.7744/cnujas.2014.41.1.041
The pedigree data of 86,639 heads from six major swine breeding farms were investigated to check levels of inbreeding and effective population size of breeding stocks. The average rate of inbreeding was 1.04%, 0.87%, 3.17%, 1.05%, 3.23% and 3.33% for farms A, B, C, D, E and F, respectively. The average inbreeding rate was highest for F farm and lowest for B farm. In farms D and E, there were quite large numbers of immigrant animals per generation compared to other farms. The effective population sizes calculated from the average rate of inbreeding were distributed between 83.0 and 814.8. Specific values were 282.3, 225.5, 83.0, 814.8, 302.9 and 175.7 for farms A, B, C, D, E and F, respectively. The results showed that there was no cause for concern over the current inbreeding level of major swine breeding farm populations and the inbreeding level was within an acceptable range. In addition, internal sharing rather than importing pig is necessary to strengthen seed sovereignty.
Effect of conjugated linoleic acid in diacylglycerol-rich oil on the lipid metabolism of C57BL/6J mice fed a high-fat high-cholesterol diet
Lee, Jeung Hee ; Cho, Kyung-Hyun ; Lee, Ki-Teak ;
Korean Journal of Agricultural Science, volume 41, issue 1, 2014, Pages 47~58
DOI : 10.7744/cnujas.2014.41.1.047
The effect of conjugated linoleic acid (CLA) isomers esterified in diacylglycerol (DAG)-rich oil on lipid metabolism was investigated. Since dietary DAG has been known to induce the regression of atherosclerosis, CLA-DAG and olive-DAG oils containing similar levels of DAG (51.4~54.2%) were synthesized from olive oil. Hyperlipidemic C57BL/6J mice were then fed high-fat high-cholesterol diets supplemented with these oils (5% each) for 7 wk. The CLA-DAG diet containing 2.1% CLA isomers (0.78% c9,t11-CLA; 1.18% t10,c12-CLA) remarkably increased the levels of total plasma cholesterol and glutamic oxaloacetic transaminase (GOT) along with hepatic cholesterol and triacylglycerol (TAG) contents. Furthermore, the CLA-DAG diet inhibited fat uptake into adipose tissue whereas fat deposition (especially in the liver) was increased, resulting in the development of fatty livers. Hepatic fatty acid composition in the CLA-DAG mice was different from that of the olive-DAG mice, showing higher ratios of C16:1/C16:0 and C18:1/C18:0 in the liver. The activity of hepatic acyl-CoA:cholesterol acyltransferase (ACAT) was higher in CLA-DAG mice while plasma lecithin:cholesterol acyltransferase (LCAT) activity and the ferric reducing ability of plasma (FRAP) were lower in CLA-DAG mice compared to the olive-DAG animals. Results of the present study suggest that CLA incorporation into DAG oil could induce atherosclerosis in mice.
Development of real-time chemical properties analysis technique in paddy soil for precision farming
Yun, Hyun-Woong ; Choi, Chang-Hyun ; Kim, Yong-Joo ; Hong, Soon-Jung ;
Korean Journal of Agricultural Science, volume 41, issue 1, 2014, Pages 59~63
DOI : 10.7744/cnujas.2014.41.1.059
Precision farming aims at reduced environmental impacts with increased productivity. Soils are multi-functional media in which air, water and biota occur together and form an essential part of the landscape with a fundamental role in the environment. The requirement for herbicides and fertilizers can vary within a field in response to spatial differences in soil properties. Near infrared (NIR) spectroscopy is widely used today as a nondestructive analytical technique which is capable of determining a number of physio-chemical parameters. The objectives of this study were to develop optimal models to predict chemical properties of paddy soils by visible and NIR reflectance spectra. Total of 60 soil samples were collected in spring from 20 paddy fields within central regions in Korea. Reflectance spectra, moisture contents, pH, total nitrogen (N), organic matter, available phosphate (
) of soil samples were measured. The reflectance spectra were measured in wavelength ranges of 400-2,500 nm with 2 nm interval. The method of partial least square (PLS) analysis was used to determine the soil properties. The PLS analyses showed good correlation between predicted and measured chemical properties of paddy soils in the wavelength range of 1,800-2,400 nm. Especially, it showed better performance than the previous results which used the entire wavelength range of the spectrophotometer, without considering the optimal wavelength of each soil properties.
User analysis for Jinju international agriculture & food EXPO 2013
Jeon, Sanggon ; Kim, Sounghun ;
Korean Journal of Agricultural Science, volume 41, issue 1, 2014, Pages 65~73
DOI : 10.7744/cnujas.2014.41.1.065
In Korea, many local governments has hosted the agriculture and/or food EXPO for the promotion of agro-food industry. Some EXPOs were successful to achieve their initial goal, but others were severely criticized due to wasting budget without outcome. The comprehensive debates and studies for the better management of EXPOs are required. The purpose of this paper is to analyze users for Jinju international agriculture & food EXPO 2013 and to suggest the strategies for the development of this EXPO. Survey analyses for two groups (enterprises and audiences) were conducted for this research. The results of studies present a few findings: First, the differentiated strategies for each groups (enterprises and audiences) should be developed. Second, EXPO need to attract more participants from the whole country. Third, the methods of advertisement should be improved, especially on-line ads. Fourth, various complains from participants, which are collected via surveys, need to be handled.