Bacterial leaf blight (BB) disease caused by Xanthomonas on/zae pv, oryzae (Xoo) limits rice yield in all major rice-growing regions of the world. As the bacterial pathogen is difficult to manage, the development of host-plant resistance is consideredthe most effective and economical means to control BB. Twenty-four major genes conferring resistance to various races of the pathogen have been identified and used in rice breeding programs (Lee et al 2001). Several varieties with high or moderate resistance to BB have been released under the auspices of the All India Coordinated Rice Improvement Project (AICRIP), Variety Ajaya (IET8585), released in 1994 under AICRIP, is highly resistant to all pathotypes in India (DRR 1996).
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机译：Xanthomonas on / zae pv，oryzae（Xoo）引起的细菌性叶枯病（BB）限制了世界所有主要水稻种植地区的水稻产量。由于细菌病原体难以控制，宿主植物抗性的发展被认为是控制BB的最有效和最经济的手段。已经鉴定出二十四个赋予对病原体不同种族的抗性的主要基因，并将其用于水稻育种计划（Lee等，2001）。在全印度水稻协调改良项目（AICRIP）的主持下已发布了几种对BB具有高或中度抗性的品种，1994年AICRIP发布了Ajaya品种（IET8585），它对印度的所有病原体均具有高度抗性（DRR 1996） ）。
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