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Bacterial leaf blight (BLB) of rice is a very destructive disease worldwide and is caused by  Xanthomonas oryzae  pv.  oryzae  ( Xoo ). The aim of the present study was to examine if the  Xoo  virulence pathotypes obtained using phenotypic pathotyping could be confirmed using molecular approach. After screening of 60 Operon primers with genomic DNA of two  Xoo  isolates (virulent pathotype,  Vr , and mildly virulent pathotype,  MVr ), 12 Operon primers that gave reproducible and useful genetic information were selected and used to analyze 50  Xoo  isolates from 7 West African countries. Genetic analysis revealed two major  Xoo  virulence genotypes ( Mta  and  Mtb ) with  Mta  having two subgroups ( Mta1  and  Mta2 ).  Mta1  ( Vr1 ) subgroup genotype has occurrence in six countries and  Mta2  ( Vr2 ) in three countries while  Mtb  genotype characterized mildly virulence ( MVr )  Xoo  isolates present in five countries. The study revealed possible linkage and correlation between phenotypic pathotyping and molecular typing of  Xoo  virulence.  Xoo  virulence genotypes were known to exist within country and there was evidence of  Xoo  pathogen migration between countries. Durable resistance rice cultivars would need to overcome both  Mta  and  Mtb Xoo  virulence genotypes in order to survive after their deployment into different rice ecologies in West Africa.

Genetic Analysis and Molecular Identification of Virulence in Xanthomonas oryzae pv. oryzae Isolates