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DISEASE RESPONSE OF EXOTIC RICE GENOTYPES AGAINST BACTERIAL LEAF BLIGHT AND ITS EFFECT ON VARIOUS MORPHOLOGICAL TRAITS
Abstract
The experiment was conducted for the evaluation of resistance status of near isogenic lines (IRBB lines) obtained from International Rice Research Institute (IRRI) against bacterial blight caused by Xanthomonasoryzae pv. Oryzae using RCBD design with three replications. For this purpose, 17 near isogenic lines of IR-24(check variety) having resistant genes against bacterial leaf blight of rice were studied for their gene status, resistance behavior and morphological traits. Resistance behavior of these lines was evaluated under natural artificial inoculated conditions. Plant agronomic traits like plant height, number of tillers, panicle length, number of fertile grains/panicle, 1000 grain weight; days to 50% flowering after transplanting (DAT) were also estimated along with the resistant parameters of the lines. The lines IRBB-21(having Xa-21 gene and 4% disease incidence), IRBB-59 (having xa-5, xa-13, Xa-21genes and, 2% disease incidence) and IRBB-66 (having Xa-4, Xa-7, xa-13, Xa-21 genes and, 6% disease incidence), were found to be the best resistant source against bacterial leaf blight of rice (BLB). These lines also have desirable morphological traits. So keeping in view the resistant status of these lines, excellent local breeding programme may be devised.
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Copyright (c) 2016 Muhammad Ashfaq, Muhammad Rizwan, Abdul Rashid, Muhammad Akhter, Farah Khan, Muhammad Ali, Muhammad B. Chattha, Muhammad M. Sujjad, Urooj Mubashar
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