Jeollanamdo Agricultural Research and Extension Services

Naju, South Korea

Jeollanamdo Agricultural Research and Extension Services

Naju, South Korea
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Lee K.-I.,Dongshin University | Lee K.-I.,Chosun University | Park M.-Y.,Jeollanamdo Agricultural Research and Extension Services | Pyo B.-S.,Dongshin University | Kim S.-M.,Dongshin University
Korean Journal of Pharmacognosy | Year: 2010

In result of analysis for the content determination of ursolic acid(UA) and oleanolic acid(OA) in extract of Eriobotryae folium using HPLC with UV detector, UA in chloroform extract of Moo-mok variety was showed highest content(2.7843 mg/g). And OA in ethyl acetate extract of Dae-bang variety was showed highest content(0.5898 mg/g). These result suggest that direct extraction using organic solvent(chloroform or ethyl acetate) was useful method for rapid quantitative analysis of UA and OA without preprocessing such as drying or fractionation.


Jang S.J.,Sunchon National University | Yun Y.B.,Sunchon National University | Je M.R.,Sunchon National University | Kim S.S.,Sunchon National University | And 2 more authors.
Research on Crops | Year: 2016

The objectives of this research were to quantify resistance levels in different rice biotypes to HPPD-inhibiting herbicides, benzobicyclon, mestrione, and tefuryltrione and determine mechanisms of resistance of benzobicyclon in different rice biotypes. In terms of shoot fresh weight, japonica-type, Ilmibyeo and Baekokchal were 17- and 53-73-fold more resistant to benzobicyclon and mestrione, respectively, than indica x japonica-type, Hyangmibyeo-1 and Dasanbyeo. However, responses of shoot fresh weight in rice cultivars of japonica-type to tefuryltrion were similar to those of indica x japonica-type. Carotenoids and chlorophylls contents of the japonica-type, Iilmibyeo and Baekokchal were also less affected by the benzobicyclon, than the indica x japonica-type, Hyangmibyeo-1 and Dasanbyeo. The levels of MDA and H2O2 in rice cultivars of indica x japonica-type after benzobicyclone treatment were much higher than those of rice cultivars of japonica-type. Thus, the resistance in rice cultivars of japonica-type may be caused by the result of less lipid peroxidation, less H2O2, higher carotenoid and chlorophyll contents when exposed to HPPD-inhibitibg herbicide, benzobicyclon. © 2016, Gaurav Society of Agricultural Research Information Centre. All rights reserved.


Kwon O.D.,Jeollanamdo Agricultural Research and Extension Services | Jang S.J.,Sunchon National University | Kuk Y.I.,Sunchon National University
Research on Crops | Year: 2016

The objectives of this research were to determine alternative herbicides for the control of Diplachne fusca in a greenhouse and quantify levels of yield reduction as affected by occurrence densities of Diplachne fusca in a reclaimed paddy field. An accession of D. fusca was 52-62 and 28-48% controlled even when treated with two times the recommended use rate of pyrazosulfuron+pyriminobac and methazosulfuron at two- or three-leaf stage of D. fusca, respectively. Other accessions were completely controlled by the above herbicides. The sulfonylurea-resistant D. fusca accession was controlled 100% with benzobicyclone+thiobencarb benzobicyclone+fentrazamide, fentrazamide+oxadiagyl, thoibencarb, and benzobicyclon when applied at 0 day after seeding and pyrimsulfan+ mefenacet, bensulfuron+mesotrione+pyriftalid+pretilachlor, imazosulfuron+pyraclonil+bromobutide, halosulfuron+indanofan+benfuresate, azimsulfuron+metamifop+carfentrazon and bensulfuron+mefenacet+oxadiagyl when applied at 3-leaf stage, and cyhalofop-butyl and fenoxaprofop-P-ethyl when applied at 5-leaf stage. Rice yield was reduced 48 and 88% by densities of 10 and 30 plants per m2 in rice paddy fields, respectively. The rice yield loss was directly due to reduction of the number of panicle and spikelet. © 2016, Gaurav Society of Agricultural Research Information Centre. All rights reserved.


Lee Y.-S.,Jeollanamdo Agricultural Research and Extension Services | Seo H.-Y.,World Institute of Kimchi | Kim G.-D.,Chonnam National University | Moon J.-H.,Chonnam National University | And 5 more authors.
Korean Journal of Food Science and Technology | Year: 2010

This study was performed to compare the quality and volatile components of two cucumber (Cucumis sativus L.) cultivars (Cheongnakhab, Ipchunakhab)-grown under organic and conventional conditions. The levels of pH and soluble solids in the organic system were similar to those in the conventional system. The hardness of the pulp in the organic cucumbers was slightly higher than that in conventional cucumber regardless of cultivar. However, the contents of chlorophyll a, b, and total chlorophyll in organic cucumbers were significantly (p>0.05) higher than those in conventional cucumber. The major volatile compound of fresh cucumber was (E,Z)-2,6-nonadienal regardless of cultivar and farming system. When classified by the identified components′ functional group, the rate of aldehydes was the highest of all samples. The results indicate that the quality and volatile components in organic cucumbers were similar to those in conventional cucumbers except for hardness and chlorophyll contents regardless of cultivar. © The Korean Society of Food Science and Technology.


Lee J.-Y.,Chonnam National University | Kim Y.C.,Chonnam National University | Han T.-H.,Chonnam National University | Kim S.-T.,National Horticultural Research Institute | Gi G.-Y.,Jeollanamdo Agricultural Research and Extension Services
Acta Horticulturae | Year: 2010

Rose is one of the most important cut flowers all over the world as well as in Korea. Growers in Korea are exclusively relying on foreign cultivars. A rose breeding programme was started a decade ago in Korea. Lack of knowledge lead to a number of research topics for Korean researchers. One of these topics is the low germination rate in rose seeds which is in general about 20%. High amounts of substances that inhibit germination were found in the pericarp of the achene. Four different treatments such as scarification (0, 1, 5, and 10 min), UV-irradiation (0, 5, 10, 20, and 30 min), immersion in surphuric acid (0, 5, and 10 min) and microorganism (Klebsiella oxytoca C1036 treatment for 0, 1, and 48 h), were applied to improve germination rate. Only microorganism treatments (1 and 48 h) were successful in improving germination rate by two times compared to the control. Presently several other microorganisms are being tested.


Seo J.B.,Jeollanamdo Agricultural Research and Extension Services | Shin G.H.,Jeollanamdo Agricultural Research and Extension Services | Jeong H.J.,Jeollanamdo Agricultural Research and Extension Services | Lee Y.S.,Jeollanamdo Agricultural Research and Extension Services | And 3 more authors.
Acta Horticulturae | Year: 2014

This study was conducted to examine the effect of foliar applications of a water-soluble complex fertilizer without nitrogen, on plant growth, budding and flowering of strawberry runner plants. The cultivar used was the junebearing 'Seolhyang'. After foliar spraying in one month intervals from the last ten days of July. There was a significant effect of treatments on the leaf number and dry weight. Yields at 40 days after transplanting were not affected by treatments. The budding ratio was 8.5 to 10.5% higher than the control at 35 days after transplanting, and the same trend was observed at 45 and 55 days after transplanting. The flowering ratio of the one or more leaf sprays group increased compared to the control. Therefore, it was found that during the strawberry nursery period (summer, high temperatures, long photoperiods), leaf sprays with a nutrient solution lacking nitrogen induced flower bud differentiation and increased budding ratio.

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