Physiological and molecular mechanisms of exogenous salicylic acid in enhancing salt tolerance in tobacco seedlings by regulating antioxidant defence system and gene expression

Frontiers in Plant Science, Journal Year: 2025, Volume and Issue: 16

Published: Jan. 31, 2025

Salt stress has emerged as a predominant abiotic factor that jeopardizes global crop growth and yield. The plant hormone salicylic acid (SA) notable potential in mitigating salt toxicity, yet its mechanism enhancing the salinity tolerance of tobacco plants is not well explored. This study aimed to assess benefits exogenous SA application (1.0 mM) on seedlings subjected saline soil conditions. foliar spray partially mitigated these salt-induced effects, evidenced by reduction malondialdehyde content, improvements leaf K+/Na+ ratios, pigment biosynthesis, electron transport efficiency under NaCl stress. Additionally, increased contents total phenolic compound soluble protein 16.2% 28.7% alleviate NaCl-induced oxidative damage. Under stressed conditions, activities antioxidant enzymes, including superoxide dismutase, ascorbate peroxidase, catalase, peroxidase 4.2%~14.4% sprayed seedlings. Exogenous also glutathione levels reduced their forms increasing reductase, monodehydroascorbate reductase dehydroascorbate reductase. qRT-PCR analysis revealed key genes regulating carbon assimilation, system ascorbate-glutathione cycle were activated conditions Our elucidates physiological molecular mechanisms provides practical basis for improvement environments.

Language: Английский

Biochar application improved soil properties, growth performances, essential oil, and rosmarinic acid content of Thymus vulgaris L. under salt stress

Plant Physiology and Biochemistry, Journal Year: 2025, Volume and Issue: 222, P. 109698 - 109698

Published: Feb. 24, 2025

Language: Английский