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Phytophthora erythroseptica에 의한 감자 홍색부패병 발생
류경열,김종태,함영일,김정순 한국식물병리학회 2003 식물병연구 Vol.9 No.1
Pink rot of potato (Solanum tuberosum L.) occurred at Pyeongchang in Gangwon and at Bosung in Junnam province since 1999. The disease incidence in the surveyed areas was about 5% of harvested potatoes in 2002. Affected tubers showed a dull brown appearance and the lenticels and eyes on tubers turned dark brown. The cut surface of the diseased tuber colored faint pink and the entire surface of the diseased tuber becomes deep salmon pink within 30 min. The pathogen isolated from the diseased tubers was identified as Phytophthora erythroseptica based on morphological and cultural characteristics. Mycelial mat was fairly fluffy, rosette or stellate patterns and rounded or angular hyphal swellings were formed in water. Temperature for mycelial growth was ranged from 5 to 30oC and optimal temperature was 25oC. Non-papillate sporangia were persistent on stalk and ellipsoid, ovoid, obpyriform or distorted in shape, often with a constriction distal in the middle. Size of sporangia was 41.3~69.6×26.8~47.4 (av. 55.5 ×37.1) mm. Sexuality of Phytophthora erythroseptica was homothallic. Oogonia were 30~46 mm in diameter and oospores were 28~35 mm in diameter. Elongated or cyclindrical antheridia were all amphigynous. This is the first report on potato pink rot caused by Phytophthora erythroseptica in Korea.
세균성 점무늬병균에 感染된 콩잎 葉肉 組織의 形態學的인 變化
류경열,허훈,김용기 충북대학교 농업과학기술연구소 1995 農業科學硏究 Vol.12 No.2
A comparison was made of the in vitro activities of earlier quinolone antibacterials and some antibiotics used in aquaculture in Korea and newer quinolones, aganist selected flesh bacterial pathogens. Most quinolones were shown high sensitivity against all Gram- negative strains. Some Gram- negative strains, however, showed a resistance to the earlier quinolones and antibiotics. Bacteriostatic and bactricidal effects of the newer quinolones on Gram- negative strains were higher than those of the earlier quinolones. Among the newer quinolones, norfloxacin and pefloxacin showed a great reduction of the number and rate of mortality, and confirmed that their therapeutic effects were very excellent. Norfloxacin and pefloxacin were also recognized to be a wide spectrum of antibacterial quinolones, and their application was expected to be effective for the treatment of many fish bacteriaal diaseases, difficult to treat with existing antibiotics. The newer quinolones were considerd to have the potential for the treatment of Gram- negative, and possibly Gram- positive, bacterial fish pathogens.
류경열,허훈 충북대학교 농업과학기술연구소 1994 農業科學硏究 Vol.11 No.2
Leaves of soybean (Paldal, Hwanggeum, Jangkyung and Manri) were sprayed with suspension of their homologus strain of Pseudomonas syringae pv. glycinea and the physiological changes were examined. The stomatal resistance increased in inocluated leaves. Preferred sites for survival and multiplication of the pathogens were the sheilds of leaf vein and the stomatal pits. Some pathogens entered the leaf tissue directly through the stomata and caused symptom after 2 days. The content of macroelements of soybean leaves were found slightly different between healthy and diseased. Magnesium content showed higher in healthy than in diseased leaves, however, potassium content was higher in diseased. There was no significant relations between macroelement content and stomatal resistance. As the time passed after inoculation, potassium content increased and then decreased, however, stomatal resistance increased constantly
류경열,류갑희,최두회,지형진,심창기,이병모,박종호,박영은 한국식물병리학회 2006 식물병연구 Vol.12 No.3
Since the cultivation of resistance cultivar is essential for organic agriculture, Phytophthora late blight resistance of 16 advanced potato clones obtained from the potato breeding laboratory at the National Institute of Highland Agriculture was evaluated. Resistance of the clone was examined through artificial inoculation in the laboratory and in the field. Dominant isolates of the pathogen in Gangwon province produced abundant sporangia on leaves of most clones showing susceptibility. The number of sporangia ranged from 107~8sporangia/ml in the susceptible clones at 7 days after inoculation. However, one clone is resistant in organic farming fields. Disease incidence was 2.3% using the resistant clone. The area under disease progress curve (AUDPC) was 75.5. Contrarily, disease incidence of the susceptible variety was 100% and the AUDPC was 1773.5 during the same cultivation period. The resistance clone named as “Haryeong” is considered suitable for organic potato cultivation in Gangwon province in Korea.
류경열,박영은,천정욱,김숭열 한국육종학회 2006 한국육종학회지 Vol.38 No.5
This work was carried out to evaluate the resistance of potato germplasm against late blight in Korea. Seven races ofPhytophthora infestans were detected from the main potato growing areas. Three races of pathogen were isolated from mono-crop-ping areas a
류경열,허훈,Ryu, Kyung-Yul,Heu, Hoon 한국식물병리학회 1995 Plant Pathology Journal Vol.11 No.1
Photosynthetic characteristics of soybean leaves infected with Pseudomonas syringae pv. glycinea were investigated for 8 days. The difference in photosynthesis rate between healthy and diseased soybean leaves decreased for 2 to 4 days after inoculation and then increased. In respiration rate, healthy and diseased leaves showed the same tendency as photosynthetic rate. The stomatal resistance increased following Pseudomonas syringae pv. glycinea infection. The total chlorophyll content of the infected leaf was less than that of the uninfected. Pseudomonas syringae pv. glycinea infection induced the malformation of stacked grana in chloroplast. Dry matter production declined after infection.
유기농 감자재배지에서 감자역병에 의한 병 진전 및 수량감소
류경열,천정욱,지형진,최두회,김병섭,김종태 한국식물병리학회 2005 식물병연구 Vol.11 No.2
Late blight of potato caused by Phytophthora infestans is one of the most destructive disease in organic farming as well as in the conventional cultivation in Korea. Incidence and progress of the disease largely depend on climatic conditions around the fields. However, the disease completely destroys whole leaves of the plant within two weeks in organic farming fields. While, potato leaves in conventional farming fields remain healthy for 5 weeks after the first symptom appearance, because fungicides were applied four times in average to control the disease. Area under disease progress curve (AUDPC) of organic farming fields ranged from 2314 to 2421 and quickly expanded compare to that of conventional farming fields. The tuber yield in the organic farming fields ranged from 0.96 ton per 10a to 1.5 ton per 10a, while it was 2.7 ton per 10a in conventional farming fields. Tuber yields were reduced to 42~63% by the infection of late blight and the reduction rate was closely related with the time of first occurrence of the disease in organic farming fields. Physiological races of the pathogen were diversified with R0,1,3,4,5,7,10,11 in organic farming fields at Hongchun area. Pathogen races were distributed with similar pattern at different areas of organic farming fields.