The investigation was conducted on three mungbean [Vigna radiata (L.) Wilczek] genotypes namely MH-421, MH-318 and Basanti genotypes to study their biochemical, and yield response in relation to terminal heat stress tolerance. The plants were 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 manipulation of sowing dates i.e. normal sown (12^th March, 2013) and late sown (29^th March, 2013). The sampling was done at 3 and 7 days after exposure (DAE) to > 35^oC temperature and the control readings were taken at the temperature below <35^oC at reproductive stage. High temperature resulted in decreased water potential relative water content, relative stress injury and yield but increase in proline content, total soluble carbohydrates and lipid peroxidation Sensitive genotypes showed large reductions in aforementioned physiological traits. On the other hand, tolerant genotype (MH 421) maintained higher proline, total soluble content, relative stress injury and yield. After 7 days of exposure to high temperature under late sown, above parameters and yield losses in most sensitive genotypes MH 318 and Basanti.

Download this article as