Abscisic acid application enhances cadmium accumulation in Sedum plumbizincicola by controlling photosynthesis, hormone signaling and antioxidant defense

文献类型： 外文期刊

第一作者： Na, Meng

作者： Na, Meng;Xu, Shangqi;Zhou, Jihai;Li, Xiaoping;Zhou, Jihai;Liu, Daokun;Zheng, Xianqing

作者机构：

关键词： Abscisic acid; Hyperaccumulator; Cadmium contamination; Antioxidant; Transcriptome

期刊名称：PLANT SCIENCE （ 影响因子：4.1； 五年影响因子：5.1 ）

ISSN： 0168-9452

年卷期： 2025 年 359 卷

页码：

收录情况： SCI

摘要： Sedum plumbizincicola (S. plumbizincicola) is a hyperaccumulator species with high potential for the remediation of cadmium (Cd)-contaminated lands. The importance of abscisic acid (ABA) in regulating phytoremediation processes has been widely recognized, but the physiological and molecular mechanisms underlying ABAmediated Cd uptake and detoxification in hyperaccumulators remain unclear. Here, we investigated how ABA application at low and high rates influenced Cd accumulation and tolerance in S. plumbizincicola, and explored the causal mechanisms. We found that at the late stage of Cd stress, ABA application (<= 20 mg.kg-1 soil) resulted in a more pronounced increase in Cd uptake by ca. 250 % in roots and ca. 50 % in leaves. Exogenous ABA also promoted Cd translocation factor from stems to leaves, which was associated with up-regulated genes related to photosynthesis, ABCB1 transporter, and copper transporter. Under Cd stress, ABA application increased superoxide dismutase activity, as well as contents of glutathione, ascorbic acid, and soluble sugar throughout the growth period. Transcriptome analysis revealed that ABA application under Cd stress significantly upregulated differentially expressed genes (DEGs) involved in hormone signaling related to auxin, cytokinin, and ABA, as well as DEGs involved in small molecule metabolic process. These results indicate that exogenous ABA may alleviate Cd toxicity in S. plumbizincicola by regulating endogenous hormone signal transduction and activating antioxidant defense systems. Overall, our findings provide valuable insights into the role of ABA in enhancing Cd phytoremediation efficiency by hyperaccumulators, advancing strategies for mitigating soil heavy metal contamination.

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