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Studies on differentiation of pathogenic race of Xanthomonas oryzae pv. oryzae in Yunnan province

Guanghai Ji

Abstract

127 strains of Xanthomonas oryzae pv. oryzae were selected from more than 300 strains in lab. The tested strains were classified into 15 pathogenic races based on strain-cultivar interaction by using 6 near-isogenic lines varieties with different resistance gene, IRBB5, IRBB4, IRBB3, IRBB14, IRBB1 and IR24. Among them race 2, 5, 7 and 8 were dominant, 6, 10, 11, 14 and 15 were special races in Yunnan, 2, 7 in Dali, 7 in Lijiang, 7, 8, 12 in Baoshan, 2, 8 in Yuxi and 5 in Honghe were dominant race, respectively. The results indicated that race distribution of X. oryzae in Yunnan was affected by geographical region.

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Key concepts: Xanthomonas oryzae pv. oryzae, Xanthomonas oryzae, Cultivar, Race (biology), Strain (injury), Biology, Xanthomonas, Gene