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A study was conducted to examine the physiological responses and yield of contrasting mungbean genotypes viz, MH 421, MH 318 and Basanti differing in their sensitivity to high temperature raised in earthen pots (30 cm diameter) filled with 5.5 kg of dune sand (Typic Torrispamments) under screen house conditions. High temperature stress was given by manipulating sowing dates i.e. normal (12 th March, 2013) and late (29 th March, 2013) sown. Samplings were done at 3 and 7 days after exposure (DAE) of temperature above 35°C at reproductive stage. Sampling below 35°C temperature was considered as control. High temperature resulted in decreased chlorophyll stability index, chlorophyll and carotenoid contents, relative stress injury and yield. Sensitive genotypes showed large reductions in aforementioned physiological traits. On the other hand, tolerant genotype (MH 421) maintained higher chlorophyll stability index, chlorophyll and carotenoid contents, relative stress injury and yield. After 7 days of exposure to high temperature under late sown, A significant decrease was noticed in genotypes MH 318 and Basanti. Key words: Chlorophyll and carotenoid contents; Chlorophyll stability index; High temperature; Relative stress injury;Vigna radiata (L.) Wilczek.1 Division of Plant Physiology FBSc SKUAST Jammu, 2 Krishi Vigyan Kendra, Doda, SKUAST Jammuis a short duration, warm season legume crop grown in Northern region the country. India is the largest producer of mungbean and accounts for about 65% of the average of India and 54% of the world production (Lambrides et al., 2007). Mungbean is one of main protein sources for the vegetarian diet. Mungbean may also be sown as an inter crop or as a green manure or cover crop. It fetches high price in the market and is a preferred pulse crop for the farmers. Mungbean crop grown in warm seasons confronts with high temperature at different growth stages in different seasons. The variation in temperature requirements and temperature extremes varies widely for different cultivars of the same species, and among difference species. The reproductive phase of many crop species is relatively more sensitive to heat stress than the vegetative phase (Martiniello and Teixeira da Silva, 2011).

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