Research in Plant Disease 2007;13(2):93-97.
Published online August 30, 2007.
토양 방선균 Streptomyces sp. MG 121의 항균활성 및 고추 생육에 미치는 효과
임태헌, 조성현, 김진호
Effects of Streptomyces sp. MG 121 on Growth of Pepper Plants and Antifungal Activity
Tae Heon Lim, Sung Hyun Cho, Jin Ho Kim
The microorganisms with the antifungal activity against Phytophthora capsici and Colletotrichum acutatum and the plant growth promotion activity were screened from forest soils of Moon-gyeong (Juheul Mountain), Gyeongsangbuk-do. One of the isolates, strain MG 121 showed antifungal activity against P. capsici and C. acutatum and possessed phosphate solubilization activity was selected to development biocontrol agent. The strain MG 121 was identified as Streptomyces sp. by analysis of 16S rDNA. On the test with pepper fruits, the strain inhibited disease incidences of late blight and anthracnose over 80%. In greenhouse test, plant height, the number of leaf, fresh weight and roots length of pepper plants upon treatment of culture suspension of Streptomyces sp. MG 121 were significantly higher than those without the bacterial cells. In addition, strain MG 121 was capable to solublize rock-phosphate after incubation for 144 hours in potate dextrose broth. The concentration of soluble phosphate in PDB amended with 0.5% rock-phosphate was increased up to 765 μg/ml.
Key Words: Antifungal activity, Colletotrichum spp., Phytophthora capsici, Streptomyces

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