科研之友
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摘要
Since 2006, a new disease caused by Phoma sp. has been identified on figwort (Scrophularia ningpoensis) in Hubei province, China. The pathogen was isolated from diseased S. ningpoensis leaves growing under field conditions, and attempts were made to identify it by cultural and morphological characteristics as well as analysis of the internal transcribed spacer region of ribosomal DNA. There were no identical matches of the DNA sequence on GenBank (highest match less than 98% identity), and morphological and cultural characteristics placed it closely with Phoma congesta, but the host species did not match. Another two species with striking similarities, P. pooiensis and P. nebulosa, are also found on Scrophulariaceae, but there were significant morphological or cultural differences from these species. Pathogenicity of the isolate was tested by inoculating 20 S. ningpoensis plants under greenhouse conditions. Koch's postulates were fulfilled by re-isolating the pathogen from the inoculated plants. This is the first report of leaf spot of S. ningpoensis caused by Phoma sp., but the exact species remains to be determined.
- 出版日期2010
- 单位华中农业大学
