Abstract
The involvement of ethylene in reversal of salt (NaCl; 50 mM) stress on photosynthetic activity and growth by salicylic acid (SA; 0.5 mM) together with sulfur (S; 2.0 mM) was studied in mustard (Brassica juncea L. cv. Pusa Vijay). Application of SA plus SO42− improved photosynthetic activity through markedly increased S-assimilation, strengthening antioxidant defense system and limiting NaCl-accrued oxidative consequences more conspicuously than their individual effect in B. juncea under 50 mM NaCl stress. Since SA acts as an inhibitor of ethylene and S-assimilation is associated with ethylene synthesis, we tried to figure out the interaction of ethylene in SA and SO42−-mediated salt tolerance. The involvement of ethylene was studied by supplementing salt-treated plants with 200 µL L−1 ethephon (an ethylene-releasing compound) or 100 µM norbornadiene (NBD, ethylene action inhibitor) to SA and SO42− treatments. Ethephon supplemented to NaCl-treated plants showed optimal ethylene formation, increasing ethylene sensitivity to enhance photosynthesis by affecting antioxidative capacity of plants. SA plus SO42− treatment decreased stress ethylene production and optimized ethylene formation under NaCl stress that contributed in the maintenance of high photosynthetic rate, which was reversed with NBD. NaCl-treated plants receiving SA plus SO42− and supplemented with NBD showed inhibited photosynthetic characteristics and growth, with minimal S-assimilation capacity, activity of antioxidant enzymes and GSH content. This showed that the reversal of salt stress by SA plus SO42− was through ethylene involvement. Overall, ethylene intervened the effect of SA in the presence of SO42− to induce S-assimilation, upregulated the enzymatic and non-enzymatic antioxidants, and imparted NaCl tolerance in plants.
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Conceptualization: N.I., N.A.K.; Investigation and data curation: F.R., M.F., Z.S; N.I., Cytological and histological analysis: Z.S., A.M., N.A.A.; Original draft preparation: F.R., Z.S., M.F. N.A.A.; Editing and content improvement: N.I., M.F., N.A.A.; Supervision: N.A.K. All authors have read and agreed to the published version of the manuscript.
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Rasheed, F., Sehar, Z., Fatma, M. et al. Involvement of Ethylene in Reversal of Salt Stress by Salicylic Acid in the Presence of Sulfur in Mustard (Brassica juncea L.). J Plant Growth Regul 41, 3449–3466 (2022). https://doi.org/10.1007/s00344-021-10526-9
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DOI: https://doi.org/10.1007/s00344-021-10526-9