Abstract
The possible protective role of exogenous SA and NO donor (sodium nitroprusside) against salt stress was examined NaCl-induced oxidative stress in Glycine max L. The results indicated that NaCl-induced ionic toxicity led to significant increase of Na+ uptake in root and shoot of soybean, while K+ and Ca2+ uptake was decreased markedly. Application of SA, SNP and the combination of SA with SNP inhibited Na+ uptake, but improved K+ and Ca2+ uptake. Under NaCl salinity, germination percentage (GP) was decreased significantly as compared with control plants. Moreover, the activity of lipoxygenase (LOX) was increased by NaCl, while the application of SA, NO and SA + SNP could decrease LOX activity in this condition. As well, activities of the polyphenol oxidase (PPO) and phenylalanine ammonia lyase (PAL) were significantly decreased by 100 mM NaCl, while the application of exogenous SA and NO increased the activities of PPO and PAL. In addition, it was observed that the SA and NO have effective functions in decreasing the damages induced by NaCl salinity. The seeds of G. max cv. Union × Elf (called L17) were obtained from the Institute of Sapling and Seed in Tehran and experiments have been done in Science and Research Branch, Islamic Azad University. After treatment with SA, SNP and NaCl, the plants were harvested for the estimation of ionic contents and assay of enzyme activities. The results showed that SA and NO act synergistically to reduce the damaging effects of salt tress via enhancing the activity of antioxidative systems.
Highlights
Soybean is an important dicot crop due to the high content of oil and protein in its seeds
Activities of the polyphenol oxidase (PPO) and phenylalanine ammonia lyase (PAL) were significantly decreased by 100 mM NaCl, while the application of exogenous Salicylic acid (SA) and Nitric oxide (NO) increased the activities of PPO and PAL
As it is shown in the table, the application of SA, NO donor and SA + sodium nitroprusside (SNP) decreased the Na+ content of shoot under salt stress, but they had no effect on the Na+ content of root
Summary
Soybean is an important dicot crop due to the high content of oil and protein in its seeds. Salt stress severely inhibits plant growth for two reasons: first by an osmotic or waterdeficit effect of salinity and second by a salt-specific or ion-excess effect of NaCl. Adaptation to salt stress requires alterations in gene expression and the application of exogenous substances including salicylic acid and nitric oxide. Adaptation to salt stress requires alterations in gene expression and the application of exogenous substances including salicylic acid and nitric oxide The molecules such as salicylic acid and nitric oxide donor have been suggested as signal transducers or messengers. These substances have obtained particular attention because of inducing protective effects on plants under NaCl salinity [2]
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