Abstract

Trichoderma harzianum 은 식물의 뿌리주변에 살아가는 근권미생물 중의 하나로 여러 가지 식물에 생육을 촉진하며 식물의 병저항성을 증강시킨다. 본 연구로부터 선발된 T. harzianum MPA167은 보리의 근권 등으로부터 분리된 183종의 트라이코데르마 균주로부터 선발되었으며 고추역병균인 Phytophthora capsici에 대한 억제효과가 우수함을 구명하였다. T. harzianum MPA167균주는 23s rDNA ITS sequences 분석 결과 T. harzianum 으로 동정하였다. 본 균주(<TEX>$1{\times}10^6$</TEX> spores/ml)의 처리는 고추역병의 방제에 가장 효과적이었으며 이 균주가 생산하는 휘발성 생육촉진물질은 담배 및 애기장대 식물의 생육을 크게 증가 시켰다. 또한 본 균주의 처리로 고추의 생육촉진과 유도저항성이 발현되었다. 이와 같은 결과로 보아 본 선발 균주인 T. harzianum MPA167는 작물의 생육촉진과 생물방제를 위한 친환경 농자재로의 활용이 가능 할것으로 생각된다. Trichoderma harzianum is one of rhizosphere fungus usually lives near the plant root regions in the soil. T. harzianum plays an important role in plant growth promotion and increases disease resistance against various plant pathogens on crops. In this study, the strain T. harzianum MPA167 was isolated from the barley rhizosphere soil in Suwon, Korea. Among 183 isolates, the strain T. harzianum MPA167 was selected as promising strain in which based on hyperparasitical activity against Phytophthora capsici and estimated disease control activity against P. capsici in the greenhouse conditions. The strain T. harzianum MPA167 was identified using 23s rDNA internal transcribed spacer(ITS) region sequences. MPA167 treatment (<TEX>$1{\times}10^6$</TEX> spores/ml) showed greater disease suppression against Phytophthora blight of red-pepper caused by P. capsici in greenhouse compared with the water-treated control. Volatiles derived from T. harzianum MPA167 elicit growth promotion of tobacco and Arabidopsis seedlings in I-plate assay. In addition, T. harzianum MPA167 strain was also found to be effective for the growth promotion and induction of systemic resistance on red-papper plant. These results suggest that MPA167 might be used as one of the potential biocontrol agents.

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