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Effect of GA3 and calcium on growth, biochemical, and fatty acid composition of linseed under chloride-dominated salinity

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Abstract

The accumulation of salts in soil is an environmental threat affecting plant growth and crop yield. Linseed or flax is an ancient crop that has multifarious utilities in terms of industrial oil, textile fiber, and products. Salt susceptibility adversely affects linseed production, particularly to meet the growing demand for nutritional and nutraceutical products. In the present study, the ameliorative potential of gibberellic acid (GA3) and calcium (Ca2+) in mitigating the adverse effects of chloride-dominated salinity stress on the growth and physiological and biochemical processes in linseed was determined. Severe salinity treatment (10 dSm−1) resulted in stunted growth of tested linseed genotypes causing a significant reduction in biomass while proline content, phenol, H2O2, lipid peroxidation, and DPPH activity were increased in comparison to control. The exogenous application of 10−6 M GA3 and/or 10 mg CaCl2 kg−1 was found to mitigate the adverse effects of salinity stress. The mitigation was accomplished through the improvement of growth indicators, increased osmoprotectants such as proline and phenol content, stimulating DPPH activity, and reduction of H2O2 content and lipid peroxidation. The comparative evaluation of different saline treatments imposed individually and in combination with GA3 and Ca2+ revealed that combined GA3 and Ca2+ application exhibited synergistic effects and was most effective in mitigating the negative impacts of salt stress. The present study unravels the ameliorative role of GA3 and Ca2+ (individual or combined) in the physiologic-biochemical adaptive response of linseed plants grown under chloride-dominated salinity and thus aids in a better understanding of the underlying tolerance mechanisms of plants to withstand stress in saline environments.

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The original contributions presented in the study are included in the article. Further enquiries may be directed to the corresponding author.

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Funding

The funds received from the University Grant Commission, India, in the form of Junior Research Fellowship and Radha Krishanan Foundation Fund, MDU, Rohtak to conduct this experiment is fully acknowledged.

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NY: investigation, data collection and analysis, writing original draft; SSA, SK, VK: conceptualization, resources, supervision, review, and editing; MS, NK, HM: formal analysis and review. All authors read and approved the final version of the manuscript.

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Correspondence to Sunder Singh Arya.

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Yadav, N., Kumar, A., Sawariya, M. et al. Effect of GA3 and calcium on growth, biochemical, and fatty acid composition of linseed under chloride-dominated salinity. Environ Sci Pollut Res 31, 16958–16971 (2024). https://doi.org/10.1007/s11356-024-32325-x

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  • DOI: https://doi.org/10.1007/s11356-024-32325-x

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