Responses of mungbean (Vigna radiata L.) genotypes to heat stress: Effects on reproductive biology, leaf function and yield traits

摘要: Abstract The rise in temperatures as a result of climate change will have adverse effects on various crops. Mungbean ( Vigna radiata L.) is grown summer-season crop many parts the world. optimum temperature for growth mungbean 28–30 °C; increase above these limits, especially during reproductive growth, are expected to inhibit its potential performance. Hence study was conducted evaluate high (>40/25 °C; day/night) performance and probe mechanisms associated with failures. Here, we tested two extra-short duration (60 days) genotypes their response heat stress under outdoor conditions well controlled environment (CE). Two cultivars (SML 832 668) were pots at sowing dates: (1) normal time (NS) 30th March so that day/night stage below 40/25 °C. plants fully irrigated both situations avoid any effect drought stress. While phenology, flowering, podding not affected, there significant reduction biomass (16–19%), pod set, number filled pods (32–38%), seed (43–47%) yield (35–40%) per plant basis due LS plants. This function such pollen viability, germination, tube load stigma receptivity heat-stressed (HS) At flowering stage, stomatal conductance photosynthetic efficiency chlorophyll concentration inhibited leaves A decrease noticed sucrose anthers along activities synthesising enzymes (sucrose synthase, phosphate synthase) hydrolysing (acid invertase), which possibly vital reason affecting traits. CE studies also revealed more than 35/25 °C, 43/30 °C, 45/32 °C (day/night) highly detrimental traits mungbean.