Toxin production by Bipolaris sorokiniana and its role in determining resistance in wheat genotypes

P. DUREJA; K.D. SRIVASTAVA, M. JAHANI, RASHMI AGGARWAL*,

Toxin production by Bipolaris sorokiniana and its role in determining resistance in wheat genotypes

2006

P. DUREJA | K.D. SRIVASTAVA, M. JAHANI, RASHMI AGGARWAL*,

Bipolaris sorokiniana causing spot blotch of wheat produces toxins, which play role in pathogenicity. The isolates of B. sorokiniana differed in their pathogenicity. The profiles of toxin isolated from BS-25 (most virulent isolate) and BS-7 (least virulent isolate) differed on TLC plate; indicating qualitative and quantitative differences. These two isolates were also differentiated on a set of wheat differential lines. Isolate BS-25 showed lowest average infection index (9.6) on genotype Sanghai 4 whereas isolate BS-7 showed 4.9 infection index on the same genotype. With crude toxin symptoms like chlorosis and necrosis on leaf were developed. The toxin from BS-25 produced severe to mild water soaking symptoms on the infiltrated leaf tissue, of Agra local.

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