Influence of photoperiod on endogenous phytohormone levels and cadmium-related gene expression in Sedum alfredii

文献类型： 外文期刊

第一作者： Chen, ShiMiao

作者： Chen, ShiMiao;Shan, Bin;Lu, QinYu;Chen, ShiMiao;Shan, Bin;Lu, QinYu;Chen, ShiMiao;Lu, QinYu;Zheng, Fuhai;Li, Yanyan

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关键词： Photoperiod; Sedum alfredii; phytohormones; cadmium; phytoremediation optimization

期刊名称：PLANT SIGNALING & BEHAVIOR （ 影响因子：3.6； 五年影响因子：3.5 ）

ISSN： 1559-2316

年卷期： 2025 年 20 卷 1 期

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收录情况： SCI

摘要： To determine whether photoperiod influences integrated physiological and molecular mechanisms underlying cadmium (Cd) uptake and tolerance in Sedum alfredii, plants were exposed to varying day lengths (2-24 h). Distinct photoperiod-dependent trends emerged: very short photoperiods primarily stimulated stress-related hormone signaling and early-stage flavonoid synthesis, while an intermediate photoperiod (similar to 10 h) concurrently enhanced growth-promoting hormones, jasmonate signaling, and antioxidant defenses. This optimal photoperiod elicited a coordinated peak in phytohormonal responses, antioxidant enzyme activities, and Cd transporter gene expression. Canonical correspondence analysis identified three major co-regulatory modules integrating hormonal signaling, secondary metabolism, and heavy-metal transport. These modules included an auxin - IAA oxidase network, an ABA - phenolic metabolism axis linked to key metal transporter genes (HMA and ZIP families), and a cytokinin - flavonoid pathway associated with additional Cd transporters. The convergence of these modules underscores a systemic regulatory mechanism balancing plant growth, defense responses, and heavy-metal management. These findings provide a mechanistic understanding of how photoperiodic signals modulate endogenous hormone networks and associated molecular processes to optimize Cd accumulation and tolerance. This study thus identifies photoperiod as a pivotal environmental cue that could inform strategies to enhance S. alfredii's effectiveness in phytoremediation of Cd-contaminated soils.

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