Control Effects of Indole Isolated from Xenorhabdus nematophila K1 on the Diseases of Red Pepper

Research in Plant Disease 2012;18(1):17-23.
Published online March 30, 2012.

Xenorhabdus nematophila K1 유래물질 인돌의 고추 병해 방제 효과

전미현 ( Mi Hyeon Jeon ) , 천원수 ( Won Su Cheon ) , 김용균 ( Yong Gyun Kim ) , 홍용표 ( Yong Pyo Hong ) , 이영근 ( Young Keun Yi )

Control Effects of Indole Isolated from Xenorhabdus nematophila K1 on the Diseases of Red Pepper

Mihyeon Jeon, Wonsu Cheon, Yonggyun Kim, Yong Pyo Hong1 and Youngkeun Yi*

School of Bioresource Sciences, Andong National University, Andong 760-749, Korea
¹Department of Applied Chemistry, Andong National University, Andong 760-749, Korea

Received: December 08, 2011 Revised: February 20, 2012 Accepted: March 20, 2012

Abstract

Indole compound is a bacterial metabolite synthesized and released by an entomopathogenic bacterium, Xenorhabdus nematophila K1. The antibiotic activity was evaluated against plant pathogens, such as Phytophthora blight and anthracnose of red pepper. Indole significantly suppressed mycelial growth of Phytophthora blight and anthracnose pathogens. Under natural sunlight conditions, indole maintained the antifungal activity for at least sixty days. The activity was not affected under the condition of soil-water. When the indole suspension was applied to surface soil before transplanting of red pepper seedlings and was then regularly sprayed to the foliage of the plants with ten days interval, it resulted in significant reduction of the disease occurrences (Phytophthora blight, anthracnose, soft rot, and black mold) by about 30%. These results suggest that indole can be used to control Phytophthora blight and anthracnose of red pepper.

Key Words: Indole, Control effect, Diseases, Red pepper