Abstract
Se can regulate Cd accumulation and translocation in plants; however, such effects can be controversial because of the differences in plant species and Se species. In this study, pak choi was cultured under hydroponic conditions, and the effects of selenite and selenate on Cd accumulation were investigated in the edible parts of this vegetable. The results showed gradual improvements in the effects of the two Se species on the Cd content in pak choi shoots at the four assessed growing stages. Selenite did not lead to significant changes in Cd accumulation in the shoots until day 40, when it significantly reduced the accumulation by 34%. Selenate was always found to increase the Cd content in the shoots, and the differences on days 19 and 40 were 16% and 45%, respectively, compared with those of the Cd (only) treatment. Accordingly, selenate invariably enhanced Cd translocation from the roots to the shoots, whereas selenite insignificantly reduced the translocation only on day 40. Generally, selenomethionine (SeMet) accounted for much larger proportions in selenite-treated plants, while SeO42− was the dominant Se species in selenate-treated plants. However, under both Se treatments, the SeMet proportion increased substantially from day 19 to day 40 when that of SeO42− exhibited a drastic decrease; therefore, the relative proportion of seleno-amino acids to SeO42− may be the key factor for the regulation of Cd accumulation in pak choi via treatment with selenite and selenate at the different growing stages.
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This work was supported by the China Agriculture Research System (CARS-23-B16) and National Natural Science Foundation of China (No. 41471271).
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Yu, Y., Zhuang, Z., Luo, Ly. et al. Difference between selenite and selenate in selenium transformation and the regulation of cadmium accumulation in Brassica chinensis. Environ Sci Pollut Res 26, 24532–24541 (2019). https://doi.org/10.1007/s11356-019-05705-x
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DOI: https://doi.org/10.1007/s11356-019-05705-x