Fatty acid composition of three species of Rhizoctonia and seven anastomosis groups including twelve intraspecific groups of R. solani was studied by gas-liquid chromatography. The major fatty acids identified were palmitic, palmitoleic, oleic and linoleic acids, which constituted 92.1-96.0% of the whole-cell fatty acids identified. A dendrogram of the three Rhizoctonia spp. showed that the isolates of R. solani and R. candida are closely related in fatty acid composition, whereas the isolates of R. oryzae were more distantly related with them. In addition, each of the anastomosis groups and intraspecific groups of R. solani was divided into individual clusters by dendrogram analysis. All of the intraspecific groups belonging to the AG-1 and AG-2 were differentiated by cluster analysis based on the percent compositions of fatty acids identified. No correlation could be obtained on the dendrogram of R. solani isolates on the fatty acid composition and pathogenicity on their respective hosts. However, this technique clearly differentiated Rhizoctonia spp. and especially of anastomosis groups and intraspecific groups of R. solani. These works clearly suggested that the fatty acid analysis will be used as one of the taxonomic tools in differentiating Rhizoctonia spp.
|Number of pages||8|
|Journal||Journal of the Faculty of Agriculture, Kyushu University|
|Publication status||Published - Dec 1 1996|
All Science Journal Classification (ASJC) codes
- Agronomy and Crop Science