Optimizing root architecture and increasing transporter gene expression are strategies to promote selenium uptake by high-se accumulating rice cultivar

文献类型： 外文期刊

第一作者： Zhang, Mu

作者： Zhang, Mu;Tang, Shuanhu;Zhang, Mu;Tang, Shuanhu;Wilson, Lolita;Jiang, Linxi;Xing, Guofang

作者机构：

关键词： Rice; Selenite; Selenate; Transporter; Uptake

期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）

ISSN： 0032-079X

年卷期： 2020 年 447 卷 1-2 期

页码：

收录情况： SCI

摘要： Aim Selenium uptake capacity can vary among rice genotypes; however, the processes driving these high- and low-Se-accumulating rice cultivars have not yet been defined. Methods The root architecture, selenium uptake, and transporter genes (Sultr2;1 and Ospt2) and selenium-binding protein (SBP1) expression of high- and low-Se rice cultivars were determined in agar culture experiment with different selenite and selenate concentrations. Results Root architecture analysis showed that the toxicity of selenite was greater than that of selenate for both rice cultivars, and the Se tolerance of the high-Se rice for selenite was greater than that of the low-Se rice. The uptake rate of selenite was greater than that of selenate, and the high-Se rice accumulated a higher Se concentration in the roots. However, selenite translocation via the xylem was limited, and the two rice cultivars accumulated similar amounts of Se in shoots when it was supplied as selenite. By contrast, selenate was highly mobile via xylem transport, and the high-Se rice accumulated a higher Se concentration in the shoots when it was supplied. The transcript levels of the Sultr2;1 and Ospt2 genes were higher in the high-Se rice than in the low-Se rice with selenite or selenate application. The application of selenite or selenate increased the SBP1 transcript level in the high-Se rice but decreased the transcript level of SBP1 in the low-Se rice. Conclusions The increased expression of phosphate and sulfate transporters and improved root architecture may explain how the high-Se rice cultivar can take up more selenite and selenate, respectively.

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