Scientific Publication

Morphological, pathogenic and genetic variability amongst sorghum isolates of Colletotrichum graminicola from India

author(s) Latha, J - Mathur, K - Mukherjee, P K - Chakrabarti, A - Rao, V P - Thakur, R P
from International Crops Research Institute for the Semi-Arid Tropics (ICRISAT)
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themes
regions
  • Southern Asia
  • Asia
  • World
citation

Latha, J and Mathur, K and Mukherjee, P K and Chakrabarti, A and Rao, V P and Thakur, R P (2002) Morphological, pathogenic and genetic variability amongst sorghum isolates of Colletotrichum graminicola from India. Indian Phytopathology, 55 (1). pp. 19-25. ISSN 0367-973X

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Abstract

A total of 18 isolates of Collectotrichum graminicola infecting sorghum in Andhra Pradesh and Maharashtra, India, were characterised and compared for morphological, pathogenic and genetic diversity. The representative single-lesion isolates and their derivatives varied significantly for morphological traits -colony colour, growth pattern and sporulation on oat meal agar medium. These isolates also exhibited significant variation for disease reaction on a set of sorghum differential lines in greenhouse tests. The isolates from the local sorghum cultivars were although different from those of CSH 9, they did infect CSH 9 indicating a virulence shift in the C. graminicola population from the local sorghum to hybrid CSH 9. Genotypic variation was studied using the random amplified polymorphic DNA (RAPD) technique. A set of six random primers could differentiate the isolates. The cluster analysis indicated a very high genetic variability among isolates of C. graminicola and amogg variants from a single lesion isolates in RAPD profile

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