Abstract
Rice seedling blight is an important disease caused by a complex of fungi that include Fusarium, Rhizopus, Pythium, and Trichoderma species. A modified MIDI method was used for extraction of fatty acids from these causal pathogens, and fatty acid methyl ester (FAME) profiles were characterized. Factors that might affect fatty acid production, such as period of culture and saponification in extraction, were also evaluated. A total of 14 fatty acids were detected, and FAME profiles showed quantitative and qualitative variations by discriminant analysis and principal component analysis. Genus-specific FAME profiles consisting of the types of fatty acid produced and remarkable components of individual fatty acids were observed. The possibility of application as chemotaxonomic methods based on the FAME profiles for diagnosis of the rice seedling blight complex is also discussed.
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