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Published on: May 1, 2018
Microsatellite Markers Display High Diversity in Bean Anthracnose Pathogen Colletotrichum lindemuthianum in Kashmir
Tabia Fayaz1, Aasiya Nabi2, Naziya Nabi1
1Plant Virology and Molecular Plant Pathology Laboratory, Division of Plant Pathology, SKUAST-Kashmir, Srinagar, 190025, India.
Abstract:
Common bean (Phaseolus vulgaris) anthracnose, caused by Colletotrichum lindemuthianum affects and decreases its yield substantially. Fifty Simple Sequence Repeat (SSR) markers were used to analyze the genetic and genotypic variation among 36 C. lindemuthianum isolates. Among the 50 SSRs, 24 were polymorphic and amplified 66 alleles. Most of the SSRs had polymorphic information content (PIC) values > 0.30, indicating their strong discriminative competence. Distance based dendrogram analysis and population structure analysis divided 36 C. lindemuthianum isolates into three clusters. Analysis of molecular variance at spatiotemporal levels showed high genetic variation among the populations. The six C. lindemuthianum subpopulations had high Shannon-Wiener indices. The multilocus genotype and genetic diversity indices show that C. lindemuthianum populations in Kashmir are diverse. The three geographic subpopulations of C. lindemuthianum rejected the null hypothesis of linkage equilibrium (p = 0.001). Before this study, all PCR based genetic diversity studies on C. lindemuthianum relied on dominant markers. This study is the first to identify 24 robust SSRs, which can be utilized to elucidate the population structure of the common bean anthracnose pathogen.
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