Characterization of Colletotrichum graminicola populations from a sorghum hybrid CSH 9 for morphological and pathogenic variability
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Authors
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KUSUM MATHUR, R.P. THAKUR and V.P. RAO
'Department of Plant Pathology, Maharana Pratap University of Agriculture and Technology, Udaipur, Rajasthan College
of Agriculture, Udaipur 313 001
'Genetic Resources and Enhancement Program. International Crops Research Institute for the Semi-Arid Tropics.
Patancheru 502 324
Keywords:
Sorghum anthracnose, pathogenic variability, virulence indexAbstract
During a field survey in the 1994 rainy season a popular commercial sorghum hybrid CSH 9 was found showing anthracnose (Coltetotrichum graminicola) symptoms in several farmers' fields in Maharashtra state of India. About 100 single-lesion isolates obtained from representative leaf samples from four fields of CSH 9 and one field of a local sorghum cultivar (LSC) were characterized and compared for morphological and pathogenic variability. The representative single-lesion isolates and their derivatives varied significantly for morphological traits - colony color, growth pattern, spore size and sporulation rate on oatmeal agar medium. These isolates also exhibited significant variation for latent period, virulence, aggressiveness, and virulence index on a set of sorghum differential lines in a greenhouse test. The isolate from the LSC, although differed morphologically from those of CSH 9, did infect CSH 9 and its parental lines, indicating a virulence shift in the C. graminicola population from the local sorghum to hybrid CSH 9.
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