Physiological evaluation of mungbean (Vigna radiata (1.) Wilczek) cultivars for heat tolerance
DOI:
https://doi.org/10.59797/jfl.v28i2.975Keywords:
Mungbean, High temperature tolerance, growing degree days, seed yield, heat susceptibility indexAbstract
Mungbean is adapted to relatively warm, dry climatic conditions of summer when day temperatures rise above 40°C during reproductive period which often results in substantial yield reduction. Therefore breeding for heat tolerance with improved yield had been a long term goal for mungbean vaietal improvement programme. The effect of heat stress during reproductive stage was investigated based on yield attributing traits, stress indices and growing degree days (Cd) in 20 high yielding mungbean cultivars released from different agro climatic zones of India. The cultivars were grown in Randomized Block Design with three replications in two environments, viz., non-stress environment (NSE) (15" July sowing) and heat-stress environment (HSE) (7th April sowing). It was seen that genotypic differences and genotype x environment interactions were significant for all the characters. Among the cultivars studied, three cultivars viz., Samrat, IPM 02-3 and IPM 2-14 were identified as the heat tolerant cultivars as indicated by their low heat susceptibility index. The thermal time (Growing degree days, Cd) to reach mean crop growth duration was 1662 °Cd under NSE while, it was 1471 °Cd under HSE.
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