ArticleFrontiers in plant science2026
Exogenous plant growth regulators alleviate natural high temperature stress after anthesis in wheat (
Article in Frontiers in plant science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Introduction: High temperature stress during the grain-filling period severely suppresses plant growth and yield formation in winter wheat. Plant growth regulators including 2,4-epibrassinolide (EBR) and melatonin (MT) have been reported to effectively enhance plant thermotolerance, representing a promising strategy to mitigate extreme high temperature stress and stabilize wheat yield. Methods: In this study, integrated agronomic, physiological and transcriptomic analyses were conducted to explore the regulatory effects of different exogenous plant growth regulators on thermotolerance and physiological characteristics of winter wheat during the grain-filling stage. Results and discussion: Exogenous application of these regulators modulated the expression of core photosynthesis-related genes, increased the net photosynthetic rate of flag leaves, enhanced photosynthetic capacity, and alleviated heat-induced damage. Meanwhile, exogenous regulators altered the transcript levels of key antioxidant enzyme-coding genes, thereby boosting antioxidant enzyme activities, reducing the accumulation of reactive oxygen species (ROS) and malondialdehyde (MDA), and relieving membrane lipid peroxidation. Coordinated regulation of photosynthetic and antioxidant metabolic pathways substantially elevates the thermotolerance of winter wheat against natural high temperature stress after anthesis. The Mix treatment (0.05 µmol L
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