Abstract
Six pathotypes of Colletotrichum falcatum, responsible for Red-rot in sugarcane, prevalent in subtropical India were examined for genetic relationships using RAPD markers. A high degree of polymorphism (78.6%) was observed using 40 RAPD markers. More than 50% genetic divergence was found among the pathotypes and UPGMA cluster analysis of genetic similarity indices grouped the six pathotypes into two clusters. Cluster I comprised pathotypes Cf01 and Cf09, while cluster II comprised the remaining four pathotypes. Cf02 and Cf08 were the most closely related among all the pathotypes. Pathotype-specific unique bands generated in RAPD profiling are being used for developing markers for pathotype identification in diseased cane samples.
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