Optimizing Morpho-Physiological Traits of Black Gram (Vigna mungo L.) in the Summer Season Mediated by Putrescine and Cadaverine

Background: Black gram (Vigna mungo L.), a vital legume crop, frequently encounters growth challenges due to environmental stress, leading to reduced yield and productivity. This study aimed to determine the impact of putrescine and cadaverine on the morpho-physiological growth of the black gram variety MASH 1008. Methods: The present piece of work was executed on the Research Farm of Lovely Professional University in the summer season of 2022-2023 in a randomized block design with a total of 8 possible combinations of polyamines i.e. Putrescine and Cadaverine with 3 replications. Result: Among the treatments, the most effective treatment was T3, i.e. putrescine (1.5 mM) +cadaverine (1 mM), which was observed as a statistically highly significant at p less than 0.05% for most of the parameters, resulting in maximum plant height, number of leaves, fresh weight, dry weight, leaf area, leaf area index (LAI), crop growth rate (CGR), leaf area duration (LAD), chlorophyll index and total chlorophyll content, Chlorophyll a and b (66.74 cm, 20.47, 71.52, 12.27 g plant-1, 433.90 cm2 plant-1, 1.91, 54.91 mg g-1 day-1, 0.938, 54.13, 2.71, 1.13 and 1.17 mg g-1 at 90 DAS respectively. These results strongly suggest that applying polyamines, particularly the combination of putrescine and cadaverine, can significantly enhance morpho-physiological growth and yield of black gram, especially under adverse environmental conditions.