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Geethu, Thomas and George , Thomas (2010) MOLECULAR EVOLUTION OF A PR-5 PROTEIN GENE IN ZINGIBER SPECIES WITH CONTRASTING BREEDING SYSTEMS. ACM Publications Proceedings of the International Symposium on Biocomputing . ISSN ISBN: 978-1-60558-722-6

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In Zingiber species, mode of propagation ranges from obligatory asexual multiplication in ginger through mixed breeding in Z. zerumbet to predominant sexual reproduction in Z. cernuum and Z. neesanum. Pattern of resistance towards soft rot disease caused by the oomycete pathogen Pythium also varies among these species, from resistance in Z. zerumbet to high susceptibility in Z. officinale. In this study, nucleotide diversity of a defense gene, PR5 and a non defense gene, methionine synthase were compared in Zingiber species with contrasting breeding system. As a whole, the analysis revealed higher levels of nucleotide diversity in PR5 genes as compared to methionine synthase, and evidence for transient episodes of positive selection experienced by this gene in the past. Contrary to expectations, the nucleotide diversity was higher in obligatory asexual Z. officinale, suggesting the possibility of accumulation of deleterious mutations. Results indicate accelerated evolution of PR5 genes in Zingiber species; perhaps to co evolve adaptive variants against evolving pathogen populations.

Item Type: Article
Uncontrolled Keywords: PR5 (Class 5 Pathogenesis related gene), Zingiber zerumbet, ginger, Pythium, molecular evolution, nucleotide diversity, breeding systems.
Subjects: Plant Disease Biology & Biotechnology
Depositing User: Rgcb Library
Date Deposited: 03 Sep 2019 09:52
Last Modified: 03 Sep 2019 09:52
URI: http://rgcb.sciencecentral.in/id/eprint/861

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