The crucial role of lateral root angle in enhancing drought resilience in cotton

文献类型： 外文期刊

第一作者： Guo, Congcong

作者： Guo, Congcong;Bao, Xiaoyuan;Sun, Hongchun;Zhu, Lingxiao;Zhang, Yongjiang;Zhang, Ke;Bai, Zhiying;Li, Anchang;Liu, Liantao;Li, Cundong;Chen, Jing;Zhang, Jianhong;Zhang, Haina

作者机构：

关键词： drought; lateral root angle; stomata; canopy temperature; cotton

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.6； 五年影响因子：6.8 ）

ISSN： 1664-462X

年卷期： 2024 年 15 卷

页码：

收录情况： SCI

摘要： Introduction Plant responses to drought stress are influenced by various factors, including the lateral root angle (LRA), stomatal regulation, canopy temperature, transpiration rate and yield. However, there is a lack of research that quantifies their interactions, especially among different cotton varieties.Methods This experiment included two water treatments: well-watered (75 +/- 5% soil relative water content) and drought stress (50 +/- 5% soil relative water content) starting from the three-leaf growth stage.Results The results revealed that different LRA varieties show genetic variation under drought stress. Among them, varieties with smaller root angles show greater drought tolerance. Varieties with smaller LRAs had significantly increased stomatal opening by 15% to 43%, transpiration rate by 61.24% and 62.00%, aboveground biomass by 54% to 64%, and increased seed cotton yield by 76% to 79%, and decreased canopy temperature by 9% to 12% under drought stress compared to the larger LRAs. Varieties with smaller LRAs had less yield loss under drought stress, which may be due to enhanced access to deeper soil water, compensating for heightened stomatal opening and elevated transpiration rates. The increase in transpiration rate promotes heat dissipation from leaves, thereby reducing leaf temperature and protecting leaves from damage.Discussion Demonstrating the advantages conferred by the development of a smaller LRA under drought stress conditions holds value in enhancing cotton's resilience and promoting its sustainable adaptation to abiotic stressors.

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