Black gram (Urd bean) is an important pulse crop preferred in South India due to its daily dietary component. Often the productivity is limited by environmental stresses particularly of water, salinity and high temperature. Transitory or constantly high temperatures cause an array of morpho-anatomical, physiological and biochemical changes in plants, which affects the plant growth and development and may lead to a drastic reduction in economic yield. The adverse effects of heat stress can be mitigated by developing crop plants with improved thermo tolerance using various genetic approaches. A thorough understanding of physiological responses of plants to high temperature, mechanisms of heat tolerance and possible strategies for improving crop thermo tolerance is imperative. The sugar metabolism is an important parameter and understanding the thermo tolerance in terms of total carbohydrate and starch content might through light on genotypic variability. Among the nineteen black gram genotypes screened under controlled atmospheric studies have shown that VBG – 06 – 002 has shown promising for heat tolerance as the carbohydrate content in leaves and starch content in the grains was least affected by heat stress and deserve to be evaluated further. There were only 2.8 and 5.07 per cent reduction in the carbohydrate and starch content due to heat stress when compared other genotypes which have recorded more reduction in both parameters indicating genotypic superiority for heat stress. Based on the biochemical analysis, black gram genotype.
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