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VOL. 7, ISSUE 4 (2025)
Interactive effects of salinity and plant growth regulators on antioxidative enzymes in soybean (Glycine max L.)
Authors
Ram Priyanka D, UK Kandoliya, MV Parakhia, SB Bhatt, HP Gajera, AG Vala
Abstract
Salinity is a major abiotic stress that disrupts plant growth by inducing oxidative damage through the overproduction of reactive oxygen species (ROS). This study aimed to evaluate the impact of exogenous application of plant growth regulators (PGRs) on the antioxidant enzyme responses in soybean (Glycine max L.) under saline irrigation. A pot experiment was conducted using variety GS-4, with two irrigation treatments (tap water and saline water at 6 dS/m) and seven foliar treatments: control, GA₃ (100 ppm), SA (100 ppm), IAA (500 ppm), and combinations thereof. Leaf samples were collected at 25 and 35 days after sowing (DAS) and analyzed for the activities of peroxidase (POX), catalase (CAT), polyphenol oxidase (PPO), and ascorbate peroxidase (APX). Results revealed that salinity significantly enhanced the activity of all four antioxidant enzymes, indicating the plant’s defensive response to oxidative stress. Among the treatments, the combination of SA + IAA (T₆) consistently resulted in the highest activities of POX and APX, while CAT and PPO activities were generally reduced in treatments with combined PGRs. The highest enzyme activities were observed at 35 DAS under saline conditions. Interaction effects among irrigation, growth regulator treatments, and growth stages were statistically significant for all enzymes except APX. Overall, the findings suggest that foliar application of SA and IAA effectively boosts antioxidant enzyme activity in soybean, offering a potential strategy to mitigate salinity-induced oxidative stress and improve crop resilience under adverse environmental conditions.
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Pages:93-96
How to cite this article:
Ram Priyanka D, UK Kandoliya, MV Parakhia, SB Bhatt, HP Gajera, AG Vala "Interactive effects of salinity and plant growth regulators on antioxidative enzymes in soybean (<i>Glycine max</i> L.)". International Journal of Agriculture and Plant Science, Vol 7, Issue 4, 2025, Pages 93-96
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