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International Journal of Plant Pathology

Year: 2010 | Volume: 1 | Issue: 2 | Page No.: 58-68
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Authors

M. Lalitha Shanti

C. Mohan Kumar Varma

P. Premalatha

G. Lalitha Devi

Usha Zehr

Wayne Freeman

Keywords

Bacterial blight caused by Xanthomonas oryzae pv. oryzae has been and is one of the major constraints for rice production by virtue of its greater adaptation and pathotype variations since, its identification in the early seventies. The pathogen population being very dynamic is changing at an accelerated pace and posing a serious challenge to the agricultural sector. The present study was undertaken to understand and gain an insight on the prevalent pathogen population which is a prerequisite for deployment of the right combination of resistant genes to combat the pathogen population. Infected leaf samples were systematically collected from a hotspot (Maruteru) of the disease and were characterized by following both field inoculation pathotyping and at molecular level by DNA fingerprinting. Greater variation was observed in the molecular phenotypes than in virulence patterns. Among genes and their combinations studied, the four gene combination (Xa4+xa5+xa13+Xa21) was found more resistant against the isolates. Such observations open up new strategies and paradigms for aiming at focused breeding programs for more stable and durable resistant cultivars by pyramiding favorable genes together.
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