Post-Flowering High Temperature and Drought Stress Impair Wheat Yield via Physiological and Molecular Disruption of Source-Sink Dynamics and Starch Metabolism
文献类型： 外文期刊
作者： Li, Qiao 1 ; Ye, Yangchun 1 ; Wang, Demei 1 ; Wang, Yanjie 1 ; Zhang, Min 2 ; Ma, Ruiqi 1 ; Zhang, Lingxin 2 ; Cai, Ruiguo 2 ; Zhao, Guangcai 1 ; Chang, Xuhong 1 ; Liu, Xiwei 1 ;
作者机构： 1.Chinese Acad Agr Sci, Ctr Crop Management & Farming Syst, Inst Crop Sci, Key Lab Crop Physiol & Ecol,Minist Agr, Beijing, Peoples R China
2.Hebei Normal Univ Sci & Technol, Coll Agron & Biotechnol, Hebei Lab Crop Stress Biol, Qinhuangdao, Peoples R China
关键词：
carbohydrate partitioning; drought stress; grain filling; high temperature;
期刊名称：PLANT CELL AND ENVIRONMENT （ 影响因子：6.3； 五年影响因子：7.7 ）
ISSN： 0140-7791
年卷期： 2025 年
页码：
收录情况： SCI
摘要： Enhancing wheat resilience to concurrent high-temperature (HT) and drought stress (DS) is critical for sustainable agriculture under climate change. However, the physiological and molecular mechanisms underlying their combined effects (DHS) remain poorly understood. Here, a 3-year field study evaluated post-flowering HT, DS and DHS impacts on two wheat cultivars, Zhongmai 36 (ZM36) and Jimai 22 (JM22). Yield losses under HT, DS and DHS averaged 16.9%, 15.3% and 31.7%, respectively, with DHS exhibiting supra-additive effects. Stressors reduced net photosynthetic rate (Pn), PSII efficiency (Fv/Fm) and proton conductivity (gH+/vH+) in flag leaves, leading to 18.1% lower sucrose and 42.4% reduced post-flowering photosynthetic accumulation under DHS. Furthermore, vascular bundle number and area in rachis decreased by 23.8% and 12.9% (ZM36) and 14.3% and 20.3% (JM22) under DHS, impairing sucrose transport. Transcriptomic analysis revealed downregulation of starch biosynthesis genes (AGPase, SS and GBSS) and upregulation of starch degradation genes (ISA3, BAMY2) under DHS, creating a metabolic 'sink trap'. Collectively, these multi-level findings elucidate the hierarchical disruption of source-sink coordination under combined stresses and provide actionable targets for breeding climate-resilient wheat.Summary StatementField study revealed post-flowering combined heat and drought stress caused supra-additive yield loss in wheat by impairing source-sink coordination and altering starch metabolism via downregulation of biosynthesis genes (AGPase, SS and GBSS) and upregulation of degradation genes (ISA3 and BAMY2).
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