Genotypic and Pathotypic Diversity in Xanthomonas oryzae pv. oryzae in Nepal

Phytopathology
T B AdhikariJ E Leach

Abstract

ABSTRACT Among the 171 strains of Xanthomonas oryzae pv. oryzae (the bacterial blight pathogen of rice) collected from eight rice-producing zones in Nepal, 31 molecular haplotypes were distinguished using two polymerase chain reaction-based assays. Six common haplotypes represented nearly 63% of the strains, and some haplotypes were geographically dispersed. Multiple correspondence analysis divided the collection into five putative genetic lineages. Lineages 1, 2, and 4 were the most frequently detected and occurred in diverse geographic populations. Twenty-six pathotypes (virulence phenotypes) of X. oryzae pv. oryzae were identified using 11 near-iso-genic rice lines, each containing a single gene for resistance. The 26 pathotypes grouped into five clusters, and cluster 1 contained wide virulence spectrum strains from all geographic populations. Although molecular variation was greatest between strains of different virulence phenotypes, some variation was observed among strains with identical virulence. There was a weak correlation (r = 0.52) between molecular haplotypes and virulence phenotypes. There are two major groups of X. oryzae pv. oryzae in Nepal. One group consists of strains with high molecular polymorphism and many...Continue Reading

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Citations

May 18, 2007·Molecular Plant-microbe Interactions : MPMI·Carolina GonzalezValérie Verdier
Dec 30, 2011·Phytopathology·Tika B AdhikariJ Michael Bonman
Oct 24, 2008·Phytopathology·Melanie L Lewis IveySally A Miller
Jan 9, 2004·Applied and Environmental Microbiology·Silvia RestrepoValérie Verdier
Jun 15, 2010·BMC Microbiology·Mauricio Soto-SuárezValérie Verdier
Sep 1, 2009·Integrative and Comparative Biology·Angela M WynneJonathan P Godbout
Oct 4, 2011·Journal of Biotechnology·Valérie VerdierJan E Leach
Sep 1, 2006·Molecular Plant Pathology·David O Niño-LiuAdam J Bogdanove
Nov 30, 2000·Proceedings of the National Academy of Sciences of the United States of America·C M Vera CruzJ E Leach
Jun 2, 2006·International Journal of Systematic and Evolutionary Microbiology·Guixiang PengZhiyuan Tan

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