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최경자(Gyung Ja Choi),김진철(Jin-Cheol Kim),장경수(Kyung Soo Jang),이선우(Seon-Woo Lee),김진석(Jin-Suk Kim),조광연(Kwang Yun Cho) 한국농약과학회 2002 농약과학회지 Vol.6 No.2
Disease control activities of the methanol extracts from 27 plant species were investigated against six plant diseases such as rice blast, rice sheath blight, tomato gray mold, tomato late blight, wheat leaf rust and barley powdery mildew. The extracts of Humulus japonicus, Hosta longipes, Liriope platyphylla, and Astragalus membranaceus exhibited a great in vivo control activity against rice blast. Similarly, the extracts of Commelina communis and A. membranaceus were highly active on tomato gray mold and barley powdery mildew, respectively. The extracts of H. longipes, L. platyphylla, Solanum nigrum and A. membranaceus showed especially high disease control activity against wheat leaf rust, and then were selected for further tests such as protective, curative, systemic, and lasting activity against wheat leaf rust. The extracts of L. platyphylla and S. nigrum were strong protectant, and that of A. membranaceus possessed both a preventive activity and a curative activity. Systemic disease control by the selected four plant extracts was investigated by exarning trans laminar activity from leaf-under-surface to leaf-upper-surface and systemic activity by leaf-to-leaf movement. All extracts strongly controlled wheat leaf rust by translaminar movement, but hardly controlled the disease by leaf-to-leaf movement. Good lasting activity was also observed against wheat leaf rust from all of the tested extracts. Especially, disease control experiments on wheat seedlings sprayed with the extracts of S. nigrum or H. longipes 7 days prior to inoculation represented control value over 95%. These results suggest that methanol extracts of H. longipes, L. platyphylla, S. nigrum, and A. membranaceus, especially S. nigrum, would potently control wheat leaf rust caused by Puccinia recondita in the fields.
Fusarium oxysporum이 생산하는 dehydrofusaric acid의 몇 가지 식물 생육에 대한 활성
홍경식(Kyung Sik Hong),김진철(Jin-Cheol Kim),최경자(Gyung Ja Choi),김흥태(Heung Tae Kim),황인택(In Taek Hwang),조광연(Kwang Yun Cho) 한국농약과학회 2002 농약과학회지 Vol.6 No.3
A phytotoxin was purified by repeated chromatography from liquid cultures of Fusarium oxysporum BG isolated from barnyardgrass. Its chemical structure was determined to be dehydrofusaric acid by mass and NMR spectral analyses. The substance showed a potent phytotoxic activity against growth of duckweed with a EC?? value of 1.5 ㎍/㎖. It also inhibited the root growth of barnyard millet, cress, barnyard grass, and rice cultivar 'Dongjin'. However, it had no inhibitory activity against seed germination of barnyard millet and cress, and the shoot growth of the four plant species.
장경수(Kyung Soo Jang),김흥태(Heung Tae Kim),유주현(Joo Hyeon Yoo),최경자(Gyung Ja Choi),김진철(Jin-Cheol Kim),조광연(Kwang Yun Cho) 한국농약과학회 2001 농약과학회지 Vol.5 No.2
Controlling effect of several surfactants on barley powdery mildew (pathogen : Erysiphae graminis) and those influence on fungicidal activity by tank-mixing with commercialized fungicides were investigated in greenhouse test with barley seedlings. While protective activity of PNPP showed 90% at 1,000 ㎍/㎖, that of LN 13.0 91.2%, the best among 8 surfactants used in curative test. With 500 ㎍/㎖, LN 13.0 showed 4% of disease percentage on the first leaf of barley continuously 4 days after the curative application. Except for PNPP, the other surfactants, including NP 13.0, LN 13.0, and PAS, showed good inhibitory activity against spore germination in water agar medium amended with those surfactants. PAS, which showed very poor effect against barley powdery mildew in greenhouse test, strongly inhibited spore germination. Fungicide of triadimefon and triforine showed no controlling activity against Erysiphae graminis in barley seedlings, but they highly controlled powdery mildew in case of addition with 500 ㎍/㎖ of LN 13.0 and Tween 20. SP 13.0, NP 13.0, LN 13.0 and DBC showed severe phytotoxicity in first leaf ofbarley seedlings, but Tween 20, SLIS, PAS, and PNPP not at 10,000 ㎍/㎖.
Chitinase 유전자 도입 형질전환 감자식물체의 역병저항성
최경화,양덕춘,김현순,최경자,조광연,정혁,Choi, Kyung-Hwa,Yang, Duk-Chun,Kim, Hyun-Soon,Choi, Kyung-Ja,Cho, Kwang-Yeon,Jung, Hyuk 한국식물생명공학회 1999 식물생명공학회지 Vol.26 No.3
Chitinase 유전자가 삽입된 감자 Belchip 품종의 형질전환체와 대조구에 곰팡이 병원균을 접종하였다. 7개 계통의 형질전환식물체를 12cm정도 키운 후 병원균인 Phytophthora infestans의 zoospore를 접종하여 인공적으로 역병을 유발시켰다. 그 결과 발병율에 따라서 세 그룹으로 분리되었는데 대조구에 비하여 감염 정도가 심한 것 2개 계통. 비슷한 3개 계통, 발병 정도가 약한 2개 계통으로 구분되었다. 대조구에 비하여 저항성이 높았던 2개 계통과 발병이 심했던 1개 계통만을 대상으로 하여 2차실험을 실시한 결과, 1차실험과 비슷한 경향을 나타냈다. 포장에서 생육된 2개의 저항성 계통은 자연적으로 발생한 역병에 대해서도 역시 대조구에 비하여 역병저항성이 더 높았다. A fungal infection assay between normal and transgenic potato harboring chitinase gene in cultivar Belchip was investigated. In the first stage of experiment, seven transgenic lines having 12cm tall were tested for their resistance against potato late blight pathogen Phytophthora infestans by infection with the zoospores, artificially, Susceptibility to potato late blight infection could be classified into three types based on the rate. In terms of resistance to the disease, two lines were higher, two lines were more suppressive, and three lines were similar as compared with the control. In the following experiment, only 2 risistant lines and 1 suppressed line were used to confirm the resistance again. The results of both experiments were similar. Furthermore, two highly resistant transgenic lines grown in field exhibited a higher resistance than control under the conditions of natural ocurrence of the fungal disease.
보리와 오이 흰가루병에 대한 Kresoxim-methyl의 훈증 효과
김흥태(Heung Tae Kim),장경수(Kyung Soo Jang),최경자(Gyung Ja Choi),조광연(Kwang Yun Cho) 한국농약과학회 2006 농약과학회지 Vol.10 No.4
The protective effect of kresoxim-methyl was investigated on 6 important plant diseases, and the vapour effect of it did on barley and cucumber powdery mildews, respectively. With 2.0 ㎍ ㎖?¹ of kresoxim-methyl, its high activities against wheat leaf rust and barley powdery mildew were showed such as 92 and 100%, while activities were very low against rice sheath blight, tomato gray mold, and tomato late blight. In vapour phase control activity of kresoxim-methyl against barley powdery mildew was positively correlated with the applied concentrations, except for azoxystrobin and metominostrobin. With 200 ㎍ ℓ?¹, its control value was 71.9%. When 1000 ㎍ m?³ of kresoxim-methyl in vapour phase was applied on 4 plants of cucumber in a vinyl chamber, 51.1% of control value on kresoxim-methyl-treated cucumber was showed 7 days after the application.
홀아비꽃대(Chloranthus japonicus) 뿌리로부터 분리한 shizukanol들의 생물활성
박미란(Mi Ran Park),김혜영(Hae Young Kim),최경자(Gyung Ja Choi),이선우(Seon-Woo Lee),장경수(Kyoung Soo Jang),김진석(Jin-Seog Kim),홍경식(Kyung-Sik Hong),박노중(No-Joong Park),조광연(Kwang Yun Cho),김진철(Jin-Cheol Kim) 한국농약과학회 2004 농약과학회지 Vol.8 No.4
The methanol extract of Chloranthus japonicus roots effectively controlled the development of rice blast(Magnaporthe grisea), rice sheath blight(Corticium sasaki), tomato gray mold(Botrytis cinerea), tomato late blight(Phytophthora infestans), and wheat leaf rust(Puccinia recondita). From the methanol extract of C. japonicus roots, three antifungal substances were isolated. Their chemical structures were determined to be shizukanols B, C, and D mainly by mass and NMR spectral data. Among the three substances, shizukanol C showed the strongest inhibitory activity against mycelial growth of the plant pathogenic fungi tested; it completely inhibited mycelial growth of M. grisea, Colletotrichum gloeosporioides, and C. acutatum at concentrations of more than 12.5 ㎍/ and P. infestans at concentrations of more than 3.13 ㎍/㎖. They also controlled effectively the development of rice blast and wheat leaf rust. On the other hand, they caused phytotoxic symptoms on barley leaves and inhibited the growth of duckweed (Lemna paucicostata) with EC?? values of 30.0 ㎍/㎖ for shizukanol B, 49.9 ㎍/㎖ for shizukanol C, and 154 ㎍/㎖ for shizukanol D. In addition, shizukanol C showed an insecticidal activity against brown planthopper (Nilaparavata lugens), green peach aphid (Myzus persicae), diamond-back moth (Plutella xylostella), and tobacco cutworm (Spodoptera litura) of the 5 arthropod pests tested with mortality values of more than 60% at a concentration of 1,000 ㎍/㎖.