Sucrose accumulation and ROS signaling drive plastic mulching-induced leaf senescence in short-season cotton: A transcriptomic blueprint for yield management

文献类型： 外文期刊

第一作者： Qi, Jie

作者： Qi, Jie;Feng, Keyun;Qi, Jie;Zhang, Yanjun;Zhang, Dongmei;Xu, Shizhen;Li, Zhenhuai;Dong, Hezhong;Dong, Hezhong;Dong, Hezhong

作者机构：

关键词： Short-season cotton; Leaf senescence; RNA-Seq; Crop yield; Soluble sugars

期刊名称：INDUSTRIAL CROPS AND PRODUCTS （ 影响因子：6.2； 五年影响因子：6.2 ）

ISSN： 0926-6690

年卷期： 2025 年 235 卷

页码：

收录情况： SCI

摘要： Plastic mulching is a widely adopted agronomic practice to enhance cotton productivity, particularly in fullseason cotton systems. However, its application in short-season cotton cultivation remains debated, as mulching paradoxically accelerates late-season leaf senescence without conferring yield benefits-a phenomenon whose molecular underpinnings are poorly understood. This study integrates field physiology and transcriptomics to unravel how plastic mulching disrupts leaf longevity and boll development in short-season cotton. Over two consecutive growing seasons (2019-2020) in the Yellow River Basin of China, mulched and nonmulched short-season cotton (Gossypium hirsutum cv. Lumian 532) plants were evaluated for yield dynamics, boll distribution, and senescence-linked physiological indicators such as soluble sugars (sucrose, glucose, and fructose) and hydrogen peroxide (H2O2) levels. Results demonstrated that mulching significantly increased earlyseason boll density by 45 % and mid-season boll weight by 7.3 %. However, it concurrently reduced late-season boll density and weight by 39 % and 6 %, respectively, resulting in no yield advantages under mulching. RNASeq analysis of functional leaves at the early boll-opening stage revealed 1387 differentially expressed genes (DEGs), with key enrichment in starch and sucrose metabolism and mitogen-activated protein kinase (MAPK) signaling pathways. Notably, mulching upregulated GhSUS (sucrose synthase) and GhINV (invertase), causing enhanced accumulation of sucrose by 35.4 %, glucose by 34.2 %, fructose by 44.3 %, and H2O2 by 12.4 %, which jointly promoted reactive oxygen species (ROS) production and premature leaf senescence. Collectively, these findings mechanistically link plastic mulching to a "sugar-ROS feedback loop" that accelerates leaf senescence in short-season cotton. The study provides empirical evidence against plastic mulching in short-season systems and supports non-mulched cultivation as a sustainable alternative.

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