MORPHOLOGICAL AND PATHOGENIC DIVERSITY AMONG GRAIN SORGHUM ISOLATES OF COLLETOTRICHUM GRAMINICOLA IN INDIA uri icon

abstract

  • Thirty-three isolates of C. graminicola, collected during 1990-94 from 8 states of India were evaluated for morphological and pathogenic diversity. Colony morphology and growth rate of single-spore cultures of the isolates were compared by growing them on oat-meal agar plates and incubating at 25 deg C for 10 days. The isolates showed considerable variation in colony morphology and significant (P90%). The isolates significantly (P<0.001) varied in pathogenicity (latent period, virulence and aggressiveness). Virulence index, calculated as (virulence X aggressiveness) X latent period sup(-1) was derived to compare the pathogenic potential of the isolates. Hierarchical clustering of the isolates based on mean virulence index grouped the 33 isolates into 6 distinct clusters. Implication of these results in further virulence analysis and anthracnose management through host plant resistance is discussed

publication date

  • 1998
  • 1998