Metageographic population analysis of Colletotrichum truncatum associated with chili fruit rot and other hosts using ITS region nucleotide sequences

Journal of Plant Biochemistry and Biotechnology - Tập 25 - Trang 64-72 - 2015
Abhishek Katoch1, Chandra S. Prabhakar2,3, Prem N. Sharma1
1Molecular Plant Pathology Laboratory, Department of Plant Pathology, CSK HP Agricultural University, Palampur, India
2Department of Entomology, CSK HP Agricultural University, Palampur, India
3Department of Entomology, Bihar Agricultural University, Sabour, Bhagalpur, India

Tóm tắt

Colletotrichum truncatum is one of the most economically important fungal pathogen causing anthracnose disease in pre and post-harvest stages of many crops worldwide. Little information is available in the literature on the genetic analysis and demographic history of this fungal pathogen. In the present study nucleotide sequence data of internal transcribed spacer (ITS) region were analyzed for C. truncatum isolates infecting chili and other crops worldwide to determine a metageographic pattern of distribution and evolution of the species. Levels of differentiation (genetic distances and F ST values) among sequences of C. truncatum from 23 countries were minimal suggesting the global occurrence of a large and geographically undifferentiated population. Only 11 haplotypes were detected among 98 isolates from 24 geographically distant populations of C. truncatum. Predominant haplotype H1 which occupied a central position in the median joining network was inferred to be ancestral haplotype as it was detected at a high frequency and was shared by multiple populations. Phylogeographic pattern of the species with worldwide presence and predominance of single haplotype suggests human mediated dispersal through domestication and introduction of host plants in different parts of the world, and might have played a significant role in structuring the populations of this devastating pathogen.

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