数字农科院2.0

Optimising cotton water productivity and antioxidant capacity via foliar abscisic acid: A dual-pathway regulation mechanism

文献类型： 外文期刊

作者： Muladili Abulaiti;Hongbo Wang;Xingpeng Wang;Yakang Liang;Lei Zhang;Lingkun Jing;Lang Xin;Fuchang Jiang

作者机构：

关键词： Antioxidant enzyme activity;Antitranspirant;Endogenous hormones;Photosynthetic characteristics

期刊名称： Industrial Crops and Products

ISSN： 0926-6690

年卷期： 2026 年 240 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Minimising non-productive water loss while sustaining yield is crucial for cotton cultivation in water-limited environments. Although abscisic acid (ABA) can induce stomatal closure, its synergistic regulation of antioxidant defense and water relations during the critical flowering and boll-setting stage remains poorly understood. This study aimed to elucidate whether foliar ABA application could enhance drought tolerance through a dual-pathway mechanism that concurrently improves antioxidant capacity and optimizes leaf water-use efficiency (WUEL), and to identify an optimal concentration that balances water conservation with yield stability. A two-year field experiment was conducted with foliar applications of ABA at low (AL, 50 μmol L⁻¹) and high (AH, 100 μmol L⁻¹) concentrations, alongside a distilled water control (CK). Physiological traits, endogenous hormones, antioxidant enzyme activities, and yield components were analysed. The AL treatment activated a beneficial dual-pathway response: it directly enhanced the antioxidant system, increasing superoxide dismutase, peroxidase, and catalase activities and proline content, while reducing malondialdehyde accumulation; concurrently, it orchestrated stomatal regulation, significantly lowering stomatal conductance and transpiration rate, which collectively improved WUEL. TOPSIS analysis ranked AL as the optimal treatment, as it enhanced water-saving and antioxidant capacity without significant yield loss, unlike the AH treatment. Thus, foliar application of 50 μmol L⁻¹ ABA improves drought resistance in cotton through a synergistic dual-pathway mechanism that coordinates antioxidant defence and stomatal regulation, thereby optimising water use and alleviating oxidative stress under drought conditions. Our findings provide a mechanistic basis and a practical strategy for implementing ABA in water-saving cotton production systems.

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