Assessment of near‐isogenic rice lines for resistance toXanthomonas oryzaepv.oryzaein Nepal

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Abstract
Seven near‐isogenic lines of rice were evaluated in the glasshouse for resistance to Nepalese strains of Xanthomonas oryzae pv. oryzae the causative agent of bacterial blight in rice. Lesion length at 14 days after clip inoculation was used to characterize resistance or susceptibility of near‐isogenic rice lines to the 25 strains of X. o. pv. oryzae. Considerable variation In reactions among near‐isogenic rice lines was observed. IR‐BB3 was highly susceptible to more than 80% of X. o. pv. oryzae strains, while IR‐BB1, IR‐BB7, and IR‐BB11 were resistant to one‐third of the strains. IR‐BB4 and IR‐BB5 were moderately to highly resistant to nearly 50% of the strains. IR‐BB8 exhibited a high level of resistance to nearly two‐thirds of the strains of X. o. pv. oryzae that were evaluated. No specificity of infection was observed, suggesting that these near‐isogenic lines are of little value in discriminating amongst pathogenic races of X. o. pv. oryzae in Nepal.