ARTIFICIAL SCREENING FOR BACTERIAL BLIGHT RESISTANCE AND VALIDATION OF MARKERS FOR MARKER-ASSISTED SELECTIONA. CHANDRASEKAR AND N. KUMARAVADIVELAbstract Rice (Oryzasativa L.) is the most important food crop of the world. Breeding for resistance against Bacterial blight (BB), a destructive disease in rice, is a major challenge because of the rich diversity of the pathogen, Xanthomonasoryzaepv. oryzae. Rice genotypes viz., B95-1 X Abhaya (xa13), B95-1 X Tetep (Xa21), B95-1 X Kavya (Xa21), B95-1 X Aganni (Xa21), ADT38 and CO43 were screened for bacterial blight resistance in artificial condition. The study indicated that the genes xa13 and Xa21 recorded resistance reaction to bacterial blight pathogen occurring in TamilNadu. Tightly linked markers xa13-prom and pTA248 are aviable for the genes xa13 and Xa21 respectively.
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