Green Global
Foundation   Journal
...an emerging window for scientific research and publication across the globe

PHOTOSYNTHESIS, CHLOROPHYLL FLOUROSCENCE, STOMATAL CONDUCTANCE, TRANSPIRATION, WATER USE EFFICIENCY AND YIELD OF AMAN RICEGENOTYPES UNDER HIGH TEMPERATURE AT DIFFERENT GROWTH STAGES (Pages : 22 - 26)

Climate is changing and air temperature is rising due to increasing concentration of CO2 and other atmospheric greenhouse gases. The rise in atmospheric temperature causes detrimental effects on growth, yield, and quality of the crop varieties by affecting their phenology, physiology, and yield components. An experiment was conducted with six rice genotypes viz. MFG-72, RML-81, Magic-82, MFG-86, Magic-62 and RML-37 at Bangladesh Institute of Nuclear Agriculture during July-December, 2020 to assess the effect of high temperature (350C) at PI, booting and flowering stage. During PI, flowering and grain filling stage plants were kept in plant growth chamber at 350C for 5 days along with ambient temperature. Then all the plants were allowed to complete their maturity at ambient temperature. The experiment was laid out in a completelyrandomized design with three replications. Data on photosynthetic related parameters were recorded during stress imposition and yield and yield attributes were recorded at maturity. Photosynthesis, water use efficiency, yield and yield attributes decreased, stomatal conductance increased, transpiration rate varied but Fv/Fm did not vary with high temperature at different growth stage compared to ambient temperature. High temperature at flowering stage showed more detrimental effect.The rice genotypes significantly varied among the plant parameters under the treatments. The genotypes MFG-72, RML-81 and Magic-82 showed better performance under high temperature.Download