biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 61:726-732, 2017 | DOI: 10.1007/s10535-016-0698-z

Application of X-ray absorption near edge spectroscopy to the study of the effect of sulphur on selenium uptake and assimilation in wheat seedlings

Q. Q. Huang1,2, Q. Wang1, Y. N. Wan1, Y. Yu1, R. F. Jiang1, H. F. Li1,*
1 College of Resources and Environmental Sciences, China Agricultural University, Beijing, P.R. China
2 Institute of Agro-Environmental Protection, Ministry of Agriculture, Tianjin, P.R. China

Selenium (Se) is an essential trace element for humans and animals. A hydroponic experiment was performed to study the effects of sulphur (S) on Se uptake, translocation, and assimilation in wheat (Triticum aestivum L.) seedlings. Sulphur starvation had a positive effect on selenate uptake and the form of Se supplied greatly influenced Se speciation in plants. Compared with the control plants, Se uptake by the S-starved plants was enhanced by 4.81-fold in the selenate treatment, and selenate was readily transported from roots to shoots. By contrast, S starvation had no significant effect on selenite uptake, and selenite taken up by roots was rapidly converted to organic forms and tended to accumulate in roots. X-ray absorption near edge spectroscopy (XANES) analysis showed that organic forms of selenium, including selenocystine, Se-methyl-selenocysteine (MeSeCys), and selenomethionine-Se-oxide, were dominant in the plants exposed to selenite and accounted for approximately 90 % of the total Se. Whereas selenate remained as the dominant species in the roots and shoots exposed to selenate, with little selenate converted to selenite and MeSeCys. Besides, sulphur starvation increased the proportion of inorganic Se species in the selenate-supplied plants, but had no significant effects on Se speciation in plants exposed to selenite. The present study provides important knowledge to understand the associated mechanism of Se uptake and metabolism in plants.

Keywords: selenate; selenite; XANES
Subjects: XANES; selenate; selenite; sulphate; wheat

Received: November 3, 2015; Revised: August 6, 2016; Accepted: November 18, 2016; Published: December 1, 2017  Show citation

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Huang, Q.Q., Wang, Q., Wan, Y.N., Yu, Y., Jiang, R.F., & Li, H.F. (2017). Application of X-ray absorption near edge spectroscopy to the study of the effect of sulphur on selenium uptake and assimilation in wheat seedlings. Biologia plantarum61(4), 726-732. doi: 10.1007/s10535-016-0698-z
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