IlNRAMP5 is required for cadmium accumulation and the growth in Iris lactea under cadmium exposures
文献类型： 外文期刊
作者： Li, Cui 1 ; Zhang, Jia 1 ; Li, Qidong 1 ; Chen, Zhimin 1 ; Hou, Xincun 1 ; Zhao, Chunqiao 1 ; Guo, Qiang 1 ;
作者机构： 1.Beijing Acad Agr & Forestry Sci, Inst Grassland Flowers & Ecol, Beijing 100097, Peoples R China
关键词： Iris lactea; IlNRAMP5; Cd phytoremediation
期刊名称：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES （ 影响因子：8.2； 五年影响因子：7.8 ）
ISSN： 0141-8130
年卷期： 2023 年 253 卷
页码：
收录情况： SCI
摘要： Iris lactea is potentially applied for remediating Cd-contaminated soils due to the strong ability of Cd uptake and accumulation. However, its molecular mechanism underlying Cd uptake pathway remains unknown. Here, we report a member of NRAMP (Natural Resistance-Associated Macrophage Protein) family, IlNRAMP5, is involved in Cd/Mn uptake and the growth in I. lactea response to Cd. IlNRAMP5 was localized onto the plasma membrane, and was induced by Cd. It was expressed in the root cortex rather than the central vasculature, and in leaf vascular bundle and mesophyll cells. Heterologous expression in yeast showed that IlNRAMP5 could transport Cd and Mn, but not Fe. Knockdown of IlNRAMP5 triggered a significant reduction in Cd uptake, further diminishing the accumulation of Cd. In addition, silencing IlNRAMP5 disrupted Mn homeostasis by lowering Mn uptake and Mn allocation, accompanied by remarkably inhibiting photosynthesis under Cd conditions. Overall, the findings suggest that IlNRAMP5 plays versatile roles in Cd accumulation by mediating Cd uptake, and contributes to maintain the growth via modulating Mn homeostasis in I. lactea under Cd exposures. This would provide a mechanistic understanding Cd phytoremediation efficiency in planta.
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