• M.T. Islam Crop Physiology Division, Bangladesh Institute of Nuclear Agriculture, BAU Campus, Mymensingh-2202


Climate is changing and air temperature is rising due to increasing concentration of CO2 and other atmospheric greenhouse gases. Drought is one of the most prevalent forms of abiotic environmental stress that reduce crop productivity. An experiment was conducted with six mungbean (Vigna radiata L. Wilczek) mutants viz., MI-12, MM-1, MM-11, MM-2, MM-5, MM-8 along with Binamoog-8 at Bangladesh Institute of Nuclear Agriculture during March-May, 2021 to assess the effect of drought at flowering stage of the mungbean genotypes under high temperature. Plants were grown in ambient temperature and during flowering stage those were kept in plant growth chamber at 38 0C for 24 hrs under different soil moisture levels (80, 60 and 40% FC) in pot soil. After high temperature treatment, the plants were allowed to complete the maturity under sufficient soil moisture (80% FC) at ambient temperature. The experiment was laid out in a randomized complete block design with three replications. Data on photosynthesis, Fv/Fm (maximum quantum efficiency of PSII photochemistry), stomatal conductance, transpiration were recorded during stress imposition and yield and yield attributes were recorded at maturity. Under the temperature treatment photosynthesis, Fv/Fm, stomatal conductance, transpiration rate, water use efficiency and yield decreased significantly with the decrease of soil moisture levels. Photosynthesis, Fv/Fm, stomatal conductance, transpiration rate water use efficiency and yield decreased 10.10, 2.35, 7.40, 3.24, 7.16 and 34.87, respectively at 60% FC and 14.35, 7.05, 18.51, 10.81, 15.30 and 62.73%, respectively, at 40% FC compared to control. The mutants MM-5 and MM-8 showed better performance under drought and high temperature.


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