Abstract
Xanthomonas oryzae pv. oryzae causes bacterial blight of rice, and interactions between this pathogen and its host occur in a gene-for-gene manner. In contrast to other resistance genes, the dominant locus Xa21 confers resistance to all Indian and Philippine races of X. o. oryzae that have been examined. In this study, multiplication of X. o. oryzae and subsequent disease development were comparable in cultivar IRBB21 possessing Xa-21 and in the susceptible rice cultivar IR24 when plants were inoculated prior to 21 days postemergence. Resistance conveyed by Xa-21 was evident in 21-day-old plants, and the level of resistance increased with plant maturity [...]
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