IDENTIFYING VERITABLE SOURCES OF HEAT TOLERANCE IN RICE (Oryza sativa L.)
Journal Title: International Journal of Agriculture Sciences - Year 2016, Vol 8, Issue 53
Abstract
Temperature is increasing at an alarming rate due to climate change posing threat to food security by decreasing the production of rice, the world’s most important crop. Thus, we need to look for more heat tolerant strains, which can cope up with the climatic condition in future. Rice faces heat stress particularly during flowering which ultimately leads to reduction in panicle yield due to decrease in viability of the pollens and fertility of the spikelets. The present experiment was conducted taking 10 rice genotypes including heat tolerant check N-22. Genotypes were characterised on the basis of important physiological and biochemical parameters like membrane stability index: MSI, lipid peroxidation, H2O2 content and antioxidant enzymes activity (SOD, APX, GPX & CAT), which play important role in imparting tolerance to plant during heat stress. N-L-44 and N-22 displayed lower membrane damage and higher antioxidant enzyme activity. They also maintained low level of H2O2. The genotypes Vandana, Sahbhagi Dhanand CR-262-4 were more heat tolerant than Anjali, Swarna, PS-5, PB-1 and IR-64 which displayed higher production of H2O2, greater membrane damage and less antioxidant enzymes activity. Less decrease in pollen viability, spikelet fertility and panicle yield were recorded in N-22 & N-L-44 under heat stress. Vandana, Sahbhagi Dhanand CR-262-4 displayed a decrease of 30 to 35% in all three traits. But, Anjali, Swarna, PS-5, PB-1 and IR-64 were found to be very sensitive toward an increase in temperature during flowering with a decrease of more than 50% in yield. This variation in yield among various genotypes correlated with the differences in their MSI, Lipid peroxidation, H2O2 content and antioxidant enzymes activity.
Authors and Affiliations
DEEPIKA KR UMESH
Keywords
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