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Genetic Diversity within the Population of Xanthomonas oryzae pv. oryzae in India

July 1997 , Volume 87 , Number  7
Pages  760 - 765

J. Yashitola , D. Krishnaveni , A. P. K. Reddy , and R. V. Sonti

First and fourth authors: Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad-500007, A. P., India; and second and third authors: Directorate of Rice Research, Indian Council of Agricultural Research, Rajendranagar, Hyderabad-500030, A. P., India

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Accepted for publication 3 April 1997.

Xanthomonas oryzae pathovar oryzae causes a serious disease of rice in India and is endemic in all of the major rice-growing areas of the country. Sixty-seven X. oryzae pv. oryzae strains, collected mostly in 1994 and 1995, from 18 locations in India were analyzed by DNA fingerprinting methods using two separate repeat element probes from the X. oryzae pv. oryzae genome. These results show that strains belonging to a single pathogen lineage can be isolated from 16 of the 18 locations sampled; many of these locations are separated from each other by hundreds of kilometers and represent ecologically diverse rice-growing areas. Pathotyping analysis indicated that the strains in this lineage belong to pathotype 1b of X. oryzae pv. oryzae.

Additional keywords: bacterial blight of rice, pathogen populations, rice pathogen.

© 1997 The American Phytopathological Society