Sulfur levels regulate the absorption and utilization of selenite in rapeseed (Brassica napus)

文献类型： 外文期刊

第一作者： Ren, Lijun

作者： Ren, Lijun;Jiang, Weigao;Geng, Jinpeng;Yu, Tan;Ji, Gonghai;Zhang, Xiaoxue;Wang, Xinfa;Wang, Hanzhong;Ren, Lijun

作者机构：

关键词： Selenium (Se); Root-to-shoot translocation; Se species; Hydroponic; Biofortification; HPLC-ICP-MS

期刊名称：ENVIRONMENTAL AND EXPERIMENTAL BOTANY （ 影响因子：5.7； 五年影响因子：6.0 ）

ISSN： 0098-8472

年卷期： 2023 年 213 卷

页码：

收录情况： SCI

摘要： Selenium (Se) is a necessary trace element that contributes to the health of humans and animals alike. Humans rely on the consumption of Se-rich plants to achieve adequate levels of the nutrient, but many crop-growing regions are unable to keep up with demand through conventional agriculture alone. Hydroponic cultivation with inorganic Se sources such as selenate or selenite represents a valid opportunity for biofortification in plants. This method is largely free from dependence on local Se resources, and the appropriate optimizations of hydroponic ingredients have previously demonstrated improved plant Se. However, effective strategies to improve the absorption and utilization efficiency of selenite at physiological levels remain scarce. In this study, we manipulated sulfate levels in a selenite-containing hydroponic solution and found that a decreased supply was able to elevate Se contents more than 6-fold in the shoots of rapeseed seedlings, but only had a slight effect in the roots. Additionally, this low sulfur environment increased the root-to-shoot Se translocation efficiency by more than 6 times. Our Se speciation analysis showed that a large proportion of the root-absorbed selenite was transformed into organic forms under a normal sulfate supply, and that selenate and SeMeCys represent the main Se species involved in root-to-shoot translocation. A reduction in sulfate supply was also found to induce the upregulation of genes related to selenate distribution and a key rate-limiting step for organic Se biosynthesis. These findings are consistent with the dramatically enhanced accumulation of SeMet and selenate in both roots and shoots. Taken together, our results demonstrate that the regulation of sulfur levels has a great potential for the improvement of the Se enrichment efficiency in economically valuable aboveground organs of selenitetreated plants.

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