Papers

PHOTOSYNTHESIS, CONDUCTANCE, TRANSPIRATION, WATER USE EFFICIENCY AND GRAIN GROWTH OF HIGH YIELDING RICE VARIETIES UNDER WATER STRESS (Pages : 20 - 24)

M.T. ISLAM

A pot experiment was carried out at the Bangladesh Institute of Nuclear Agriculture, Mymensingh, during January to May of 2009 to assess the effect of water stress on photosynthetic rate (PN), leaf conductance (Cond), transpiration rate (Trmmol), water use efficiency (WUE) and grain growth of high yielding rice varieties and to find out relationships among those with microclimatic parameters. Water stress of 40% Field Capacity (FC) and control (100% FC) were maintained from heading to grain maturity of cv. Binadhan-5, Binadhan-6, Binadhan-7 and Iratom-24. Grain dry weight, PN, cond and Trmmol decreased and WUE increased with stress. Iratom-24 accumulated the highest grain dry matter and Trmmol followed by Binadhan-7. The highest PN was observed in Binadhan-5 followed by Binadhan-6 and Iratom-24. The highest WUE was noticed in Binadhan-5 and the lowest in Iratom-24. Grain dry matter accumulation significantly increased from fertilization to 24 days but PN decreased. Higher cond and Trmmol were observed at the beginning of grain development. Cond (r= -0.928**), Trmmol (r= -0.941**) and PN (r= -0.956**) were negatively correlated with average grain dry weight during fertilization to maturity. PN (r= -0.766*) was negatively correlated with leaf temperature (TleafoC) and photosynthetically active radiation (r= -0.716*) in sample chamber (PARi) and positively correlated with relative humidity (r= 0.753*) in sample chamber (RH_S%). TleafoC (r= 0.759 *) was positively correlated with PARi whereas RH_S% and CO2 in sample chamber (CO2S_?mol) was negatively correlated (r= -0.786*). PN (r= 0.811*) was positively correlated with relative grain growth rate (RGGR); however, RGGR (r= -0.964**) was negatively correlated with dry weight grain-1.Download


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