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EFFECT OF HIGH TEMPERATURE AT REPRODUCTIVE PHASE OF AMAN RICE VARIETIES (Pages : 8 - 12)
M.T. ISLAM AND S.E. AKTERTemperature is one of the most important environmental factors influencing crop growth, development and yield processes. Temperature is becoming the major concern for plant scientists worldwide due to the changing climate. Four Aman rice varieties (Binadhan-16, Binadhan-17, Binadhan-22 and Binadhan-23) were evaluated under high temperature (36oC) at booting, flowering and grain filling stages for 5 days along with ambient temperature. Nitrate reductase activity was the lowest with high temperature at grain filling stage followed by flowering and booting stage. Total chlorophyll content was the lowest with high temperature at flowering stage followed by grain filling and booting stage. Among the varieties, Binadhan-16 had the highest nitrate reductase activity and Binadhan-23 showed the highest chlorophyll content. Plant height was decreased more with high temperature at booting stage followed by grain filling stage. Number of effective tillers and total tillers hill-1 was not significantly affected by the temperature treatments. Reduced panicle length was found only with high temperature at booting stage. The lowest number of grains hill-1 was found with high temperature at booting stage followed by flowering and grain filling stage. The highest number of unfilled grains hill-1 was observed with high temperature at flowering stage followed by booting and grain filling stage. Thousand grains weight was significantly reduced but straw weight increased with high temperature at all the growth stages. Yield hill-1 was significantly decreased with high temperature at flowering stage followed by booting and grain filling stage. Among the varieties Binadhan-23 showed the highest values of chlorophyll content, nitrate reductase activity, yield and yield attributes followed by Binadhan-17. Download