Effect of Increasing Temperature on Phenological and Morphological Features of Mungbean (Vigna Radiata L. Wilczek)

Climate change-related temperature increases will have a negative impact on a variety of crops.Mungbean (Vigna radiata L.) is grown as a summer crop in various regions of the world.The optimal temperature for mungbean growth is 28-30°C; temperatures over these thresholds, particularly during reproductive growth are predicted to reduce the crop's potential.As a result, a research investigation was done to assess the impact of high temperatures during reproductive growth on mungbean performance and to investigate the reasons underlying reproductive failure.We examined how twenty mungbean genotypes respond to heat stress in outdoor situations.Twenty mungbean cultivars Pusa BM-3, Pusa BM-9, Pusa 1971, Pusa 9531, Pusa M.19-111, TCA-DM-19-1, MH-1703, SML-1933, MML-2560, PM-1601, PM-1520, PM-504-20-27, IPM-1604-1, IPM-604-16, IPMD-401-7, IPMD-604-1-7, Virat, Phule chetak, Phule Vaibhav, BM-2003-2 were cultivated in field condition with three sowing dates: S 1 -Early Summer (February, 15 th ), S 2 -Summer (March, 15 th ), S 3 -Late Summer (April, 15 th ).The experiment was set up in a factorial randomized block design (FRBD) with two replicates.The phenological parameters such as days to flower initiation, days to physiological maturity and the morphological parameters such as plant height at harvest and number of branches per plant at harvest.The results reveals significant variations genotypes under different sowing dates.Days to flower initiation, days to physiological maturity, plant height and number of branches plant -1 showed significantly dropped in S 3 -Late Summer (April, 15 th ).The genotype PM-504-20-27 (6.9) and Phule chetak was found thermal stress tolerant genotype with higher days to flower initiation, days to physiological maturity, plant height, number of branches plant -1 .Whereas, MML-2560 (5.17) was identified as a thermal stress susceptible genotype.