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J. Microbiol. Biotechnol. 2006; 16(2): 280-285

Published online February 28, 2006

Copyright © The Korean Society for Microbiology and Biotechnology.

Antifungal Activity Against Colletotrichum spp. of Curcuminoids Isolated from Curcuma longa L. Rhizomes

Cho, Jun-Young , Gyung Ja Choi 1, Seon-Woo Lee 2, Kyoung Soo Jang 2, He Kyoung Lim 2, Chi Hwan Lim 3, Sun Og Lee 3, Kwang Yun Cho 3 and Jin-Cheol Kim 3*

Biological Function Research Team, Korea Research Institute of Chemical Technology, Taejon 305-600, Korea Department of Agricultural Chemistry, College of Agricultural and Life Sciences, Chungnam National University, Taejon 305-764, Korea, 1Biological Function Research Team, Korea Research Institute of Chemical Technology, Taejon 305-600, Korea, 2Faculty of Applied Biotechnology, College of Natural Resources and Life Science, Dong-A University, Busan 604-714, Korea, 3Department of Agricultural Chemistry, College of Agricultural and Life Sciences, Chungnam National University, Taejon 305-764, Korea

Abstract

Methanol extract of the rhizomes of turmeric, Curcuma longa L., effectively controlled the development of red pepper anthracnose caused by Colletotrichum coccodes. In addition three antifungal substances were identified from the methanol extract of C. longa rhizomes as curcumin, demethoxycurcumin, and bisdemethoxycurcumin using mass and $^{1}H-NMR$ spectral analyses. The curcuminoids in a range $0.4-100\;{\mu}g/ml$ effectively inhibited the mycelial growth of three red pepper anthracnose pathogens, C. coccodes, C. gloeosporioides, and C. acutatum. The three curcuminoids inhibited mycelial growth of C. coccodes and C. gloeosporioides to an extent similar to the synthetic fungicide dithianon did, but the synthetic agent was a little more effective against C. acutatum. The curcuminoids also effectively inhibited spore germination of C. coccodes, and bisdemethoxycurcumin was the most active. Among the three curcuminoids, only demethoxycurcumin was effective in a greenhouse test in suppressing red pepper anthracnose caused by C. coccodes.

Keywords: Antifungal activity, Colletotrichum species, Curcuma longa, curcuminoids, red pepper anthracnose