Pathogenic and genetic characterization of six Indian populations of Colletotrichum sublineolum, the causal agent of sorghum anthracnose uri icon

abstract

  • The pathogenic and genetic characterization of populations of C. sublineolum, the causal agent of anthracnose of sorghum, was investigated in isolates from 6 locations in India. Multi-location field evaluation and greenhouse tests were done on 16 sorghum lines that comprised the International Sorghum Anthracnose Virulence Nursery (ISAVN). The lines were tested in a field trial for 4-5 years (1992-96) at 6 locations: Indore, Surat, Patancheru, Dharwad, Udaipur and Pantnagar. Plants were scored for disease reaction (R/MR/S) and for disease severity (on a 1-9 scale where 1 is no lesions and 9 is >75% leaf area covered with lesions) at the soft-dough stage in the field and at the seedling stage in the greenhouse. Significant (P<0.001) differences were observed for virulence (disease reaction) and aggressiveness (disease severity) across locations (isolates) and sorghum lines both in field and greenhouse tests. In both tests, isolate x sorghum line interactions were highly significant (P<0.001) suggesting that populations of C. sublineolum at these 6 locations were different. A random amplified polymorphic DNA (RAPD) analysis exhibited genetic dissimilarities among the isolates and these were classified into 6 groups

publication date

  • 1998