Transitions in Cadmium Speciation in Peanut Vascular Bundles and Their Impact on Cadmium Accumulation in Seeds: A Stable Isotope-Guided Mass Spectrometry Investigation

文献类型： 外文期刊

第一作者： Tang, Xin

作者： Tang, Xin;Nie, Min;Wang, Yurong;Zhou, Zhigao;Ding, Changfeng;Zhang, Taolin;Wang, Xingxiang;Tang, Xin;Nie, Min;Ding, Changfeng;Zhang, Taolin;Wang, Xingxiang;Zhang, Xiang

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关键词： cadmium species; chemicalforms; xylem; phloem; developmental stages

期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：6.2； 五年影响因子：6.4 ）

ISSN： 0021-8561

年卷期： 2025 年 73 卷 28 期

页码：

收录情况： SCI

摘要： Cadmium (Cd) speciation dynamics during vascular transport in peanut plants remain poorly defined. This study combined 113Cd isotope tracing with multiple separation techniques and targeted mass spectrometry to characterize Cd speciation across four developmental stages. Cd was primarily sequestered by proteins and pectates, limiting its vascular mobility. In the xylem, Cd2+ and low-molecular-weight complexes were detected, with cysteine (Cys)-Cd dominating in the seedling (40.8%) and maturity (26.3%) stages. Cd2+ increased to 43.9-47.8% during flowering and podding, while Cys-Cd declined below 10%. Phloem sap contained 83.5-88.6% organic Cd, including high-molecular-weight complexes (1.8-17 kDa) comprising 14.5-25.2% of total Cd. These complexes were absent in the xylem. Metabolomics indicated that amino acids in the phloem preferentially bound Cd, promoting its accumulation in seed-storage proteins. These findings clarify the dynamic speciation and vascular distribution of Cd in peanuts and provide insight into the biochemical mechanisms underlying its accumulation in seeds.

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