Unraveling heat tolerance in mungbean: insights from morpho-agronomical and physio-biochemical traits
DOI:
https://doi.org/10.53550/jfl.v39i1.2479Keywords:
Antioxidants, Chlorophyll, Climate resilience, Heat stress, Mungbean, OsmolytesAbstract
The present study evaluated 36 mungbean genotypes, including interspecific derivatives and mutants, to identify heat-tolerant types based on morphological and physio-biochemical responses. Results revealed significant variability, with MML 2556, SML 2102, and MML 2558 exhibiting superior tolerance, characterized by higher relative leaf water content (RLWC), proline content, and antioxidant activity, whereas ML 2738 and SML 2341 were highly susceptible. Heat stress markedly reduced reproductive traits such as pollen viability, pod length, and seed yield, while oxidative stress markers (malondialdehyde and hydrogen peroxide) increased. Correlation analysis showed positive associations of seed yield with RLWC, proline, carotenoids, and total chlorophyll under stress. Cluster analysis grouped genotypes into tolerant, moderately tolerant, and susceptible categories. The findings highlight the value of physiological and biochemical screening for breeding heat-resilient mungbean cultivars, crucial for sustaining productivity under rising global temperatures.
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