Multilayered omics reveals PEG6000 stimulated drought tolerance mechanisms in white clover (Trifolium repens L.)

文献类型： 外文期刊

第一作者： Zhang, Heshan

作者： Zhang, Heshan;Liu, Yang;Tian, Hong;Xiong, Junbo;Lu, Jiaoyun;Liao, Shujie;Xie, Yan;Du, Zhimin

作者机构：

关键词： Drought tolerance; White clover ( Trifolium repens L.); Transcriptomics; Metabolomics; Photosystem II (PSII) efficiency; Osmoprotection

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 226 卷

页码：

收录情况： SCI

摘要： Drought stress is a major environmental factor that severely impacts plant growth and productivity, especially in the context of global climate change. This study aims to systematically compare the drought tolerance and underlying mechanisms of three white clover genotypes - 'Haifa' (YS), 'Purple' (PL), and 'Red-flowered' (RF) -by integrating physiological measurements, transcriptomic, and metabolomic analyses. The results showed that the RF genotype exhibited superior drought tolerance, maintaining higher leaf relative water content (LWC), lower electrolyte leakage (EL) and malondialdehyde (MDA) levels, stable fast chlorophyll fluorescence induction curve (OJIP) transient curves, and high PIABS values under drought stress. The PL genotype displayed the most extensive transcriptomic response, with significant enrichment in pathways related to metal ion homeostasis, light perception, and mitochondrial function, but its physiological performance was poorer, indicating higher sensitivity to drought. The YS genotype demonstrated moderate drought tolerance, primarily relying on antioxidant mechanisms, as evidenced by the upregulation of flavonoid biosynthesis to counteract oxidative damage caused by drought. Transcriptomic and metabolomic analyses revealed both common and specific mechanisms among the three genotypes in response to drought stress. The RF genotype showed significant enrichment in pathways related to ribosome biogenesis, chlorophyll metabolism, and zeatin biosynthesis, suggesting its ability to maintain photosynthetic efficiency and growth under stress conditions. This study provides valuable insights into the complex responses of white clover to drought stress through multi-layered omics analyses, revealing the molecular basis of drought tolerance. These findings highlight potential targets for enhancing drought tolerance in white clover through breeding or biotechnological approaches, contributing to sustainable agricultural practices.

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