Abstract
The recessive Xanthomonas oryzae pv. oryzae (Xoo) resistance gene, xa25, which mediates race-specific resistance to the Xoo isolate PXO339, has previously been characterized in rice (Oryza sativa L.). Its dominant allele, Xa25, is transcriptionally induced by Xoo infection, which in turn results in susceptibility to PXO339. Utilizing a base substitution (−40, G to T) in the xa25/Xa25 promoters, a cleaved amplified polymorphic sequence (CAPS) marker was designed for effective identification of the xa25 gene. This marker co-segregated with the xa25 gene and explicitly distinguished the genotypes of xa25/Xa25 gene in rice. The marker was further tested on nine Chinese rice landraces, revealing the association of xa25/Xa25 genotypes with resistance/susceptibility to PXO339, respectively. Therefore, this marker is reliable and cost-effective for marker-assisted selection of the xa25 gene in rice.
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