PJB-2009-45
PATHOGENIC DIVERSITY IN ASCOCHYTA RABIEI (PASS.) LIB., OF CHICKPEA
SAYED RASHAD ALI1, SH. MUHAMMAD IQBAL1, UMER IQBAL1, ABDUL GHAFOOR AND ABIDA AKRAM2
Abstract
Ten isolates of Ascochyta rabiei derived from single spore cultures were studied for their morphological characters and pathogenic variability. These isolates exhibited variation in morphological and cultural characteristics. Variation in rating of each A. rabiei isolates towards all the test cultivars exhibited in a continuous manner. Susceptible cultivars showed symptoms involving lesions on the leaves and stem and even in severe cases resulted in plant mortality. Reaction of 19 chickpea genotypes to all the isolates of A. rabiei indicated that Venhar was resistant to most of the isolates and tolerant to AR 1 and AR 9 isolates, whereas as it was susceptible to the isolates AR 2. Cultivars AUG 424, C 44 and NIFA 95 showed susceptible response to all the isolates. The remaining cultivars acted as differentials and showed considerable variation in disease reaction. The grouping of isolates is expected to have indication for virulence response to various cultivars that is yet to be investigated.
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