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Exogenous Auxin Improves the Growth of Grapevine (Vitis vinifera L.) under Drought Stress by Mediating Physiological, Biochemical and Hormonal Modifications

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Journal of Soil Science and Plant Nutrition Aims and scope Submit manuscript

Abstract

Rendering grapevines more tolerant to drought can be achieved by developing effective measures in viticulture management. Here, the impact of naphthalene acetic acid (NAA) was evaluated on physiological and biochemical features, as well as growth, photosynthesis, and phytohormone levels in two grapevine cultivars under drought stress conditions. The results show that the grapevine cultivars experienced a significant inhibition of growth, impairment of cellular membranes, and suppression of photosynthesis under drought stress. Also, drought stress increased both grapevine cultivars’ osmolyte compounds and abscisic acid (ABA) concentration. By applying 50 mg L− 1 NAA, grapevines showed enhanced levels of growth when cultivated both in well-watered (90% FC) and drought-stress conditions (50% FC). NAA (50 mg L− 1) caused plants to increase osmolyte concentrations, including proline and total soluble carbohydrates, while maintaining more of their photosynthetic pigments and photosynthetic activity. Additionally, the same treatment improved the relative water content and water use efficiency, as well as IAA and ABA concentrations. Exogenous applications of 50 mg L− 1 NAA caused improvements in drought tolerance by promoting higher levels of antioxidant enzyme activity (e.g. catalase, peroxidase, ascorbate peroxidase, and superoxide dismutase) while reducing hydrogen peroxide content, electrolyte leakage, and malondialdehyde. In conclusion, NAA proved to be effective in mitigating the adverse effects of drought stress in grapevines.

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Funding

This research was supported by Bu-Ali Sina University, Hamedan, Iran (Grant IDs: 98-7-1 and 99-7-1).

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Khandani and Sarikhani contributed to the study’s conception and design. Khandani, Sarikhani, Gholami, Chehregani Rad, and Yousefi prepared material and collected data. Sivilotti and Sodini performed data analysis and prepared the figures and tables. The first draft of the manuscript was written by Khandani with the aid of Sarikhani, Sivilotti, and Sodini. All authors read and approved the final manuscript.

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Correspondence to Hassan Sarikhani.

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The authors declare no competing interests.

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Khandani, Y., Sarikhani, H., Gholami, M. et al. Exogenous Auxin Improves the Growth of Grapevine (Vitis vinifera L.) under Drought Stress by Mediating Physiological, Biochemical and Hormonal Modifications. J Soil Sci Plant Nutr (2024). https://doi.org/10.1007/s42729-024-01765-2

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  • DOI: https://doi.org/10.1007/s42729-024-01765-2

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