数字农科院2.0

Canopy microenvironment and hormonal coordination meditate defoliation dynamics under altered sink-source in high-density cotton

文献类型： 外文期刊

作者： Zhenwang Zhang;Kexin Li;Keke Yu;Mingfeng Yang;Yukun Wang;Qinghua Liao;Jiaqi Zhang;Xuelian Tang;Guodong Chen;Sumei Wan;Shanwei Lou;Fangjun Li;Xiaoli Tian;Zhaohu Li;Mingwei Du

关键词： cotton;defoliation;phytohormones;canopy temperature;sink-source ratio

期刊名称： Journal of Integrative Agriculture

ISSN： 2095-3119

年卷期： 2025 年

页码：

收录情况： SCIE（2025版） ; ; CSCD（2025-2026年度） ; ; 科技核心（2024版） ; ; 农林核心（2024版）

摘要： The sink-source balance critically regulates leaf abscission dynamics in cotton (Gossypium hirsutum L.), yet its targeted manipulation to optimize defoliation efficiency remains unexplored. Here, we conducted a two-year field experiment with cultivars ‘Xinluzao 78’ (XLZ78) and ‘Yuanmian 11’ (YM11) under four sink-source treatments: no cutting source and sink treatment (CK), cutting 1/2 leaves per plant (1/2L), cutting 1/2 bolls per plant (1/2B) and cutting all bolls per plant. Concurrently, XLZ78 received differential irrigation regimes (deficit: 2970 m³ ha-¹; conventional: 3,420 m³ ha-¹; supplementary: 4,095 m³ ha-¹) to probe boll retention effects. Key findings revealed that sink reduction (1/2B, 0B) delayed defoliation by elevating leaf relative water content (LRWC) and phytohormones (IAA and ZR), while suppressing ABA, and canopy temperature, compared to CK. This ultimately reduces the activity of cellulase (CEL) and polygalacturonase (PG) in the abscission zone. Specifically, 1/2B and 0B reduced defoliation rates by 7.3 and 13.4% (XLZ78) and 0.8 and 9.2% (YM11), over the two-year average. The 1/2L treatment had a similar effect to the cutting boll treatment. Conversely, supplementary irrigation (I4095) enhanced boll retention, sink-source ratios and canopy temperature during the defoliant application period, which increased the leaf abscission rate by 14.0% over deficit irrigation (I2970). Mechanistically, under sink limitation conditions, the combination of lower canopy temperature and hormonal changes suppresses the activation of abscission zones. These results demonstrate that managing sink-source equilibrium by minimizing leaf damage while optimizing boll load fine-tunes defoliation efficiency through microenvironment-hormone crosstalk. Our work advances the physiological framework for precision defoliation strategies in high-density cotton systems, reconciling mechanical harvesting efficiency with yield preservation.

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