Unveiling lentil responses to salt stress and gibberellic acid: phenotypic, bioactive and enzymatic dynamics
摘要
Lentil (Lens culinaris Medik.) is an important edible legume widely cultivated worldwide. Various abiotic stress factors cause significant challenges to lentils’ productivity. Among these factors, salt stress adversely affects plant growth and development, resulting in yield losses. In this study, the effects of salt stress (150 mM) on phenotypic traits such as physiological measurements, leaf color traits, relative electrolyte leakage and visual evaluation were initially evaluated in twelve lentil cultivars. Significant reductions in root and shoot weight, root and shoot length, and leaf color traits were observed under salt stress. Subsequently, the effects of different GA3 doses (control, 50 µM, 100 µM, and 200 µM) on the bioactive and enzymatic traits of lentil were investigated under varying levels of salt stress (control, 75 mM, and 150 mM) in the most salt-sensitive lentil cultivar. Application of different GA3 doses to the lentil cultivar grown under salt stress increased chlorophyll a content, total carotenoid content, total phenolic content, total flavonoid content, total soluble protein content, DPPH and CUPRAC compared to the control group. Enzyme activity analyses also revealed that GA3 treatments statistically influenced catalase (CAT) and ascorbate peroxidase (APX) activities, playing a crucial role in the plant's defense mechanisms against salt stress. Principal component analysis (PCA) revealed that PC1 and PC2 components explained 65.40% of the total variance. These findings suggest that GA3 treatments can modulate antioxidant defenses, contributing to improved salt stress tolerance in lentil, providing insights for breeding strategies aimed at enhancing salinity resilience.