Influence of photoperiod on endogenous phytohormone levels and cadmium-related gene expression in Sedum alfredii
文献类型： 外文期刊
作者： Chen, ShiMiao 1 ; Shan, Bin 1 ; Zheng, Fuhai 4 ; Li, Yanyan 5 ; Lu, QinYu 1 ;
作者机构： 1.Guangxi Subtrop Crops Res Inst, Key Lab, Nanning 530001, Guangxi, Peoples R China
2.Minist Agr & Rural Affairs, Key Lab Qual & Safety Control Subtrop Fruit & Vege, Nanning, Peoples R China
3.Guangxi Subtrop Crops Res Inst, Guangxi Key Lab Qual & Safety Control Subtrop Frui, Nanning, Guangxi, Peoples R China
4.Guangxi Acad Agr Sci, Agr Resources & Environm Res Inst, Nanning, Guangxi, Peoples R China
5.Qinzhou Inst Agr Sci, Fruit Tree Res Lab, Qinzhou, Guangxi, Peoples R China
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
页码：
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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