title: [Effects of sulfur on transformation of selenium in soil and uptake of selenium in rape].
abstract: The high-quality, high-yield rape (Brassica napus L. cv. Xiangnongyou 571) was chosen as the experimental material to undergo seedling stage soil cultivation and solution cultivation. This study was aimed to investigate the effects of sulfur (S) on the fraction and species of amend selenium (Se) in soil by applying S fertilizer, and to reveal the mechanism through which S controls the Se uptake of rape. The results showed that applications of both Se at 5 mg.kg-1 and S at 150 mg.kg-1 could provide some boost to rape growth, however such boost was unremarkable; S application could significantly reduce Se content in shoots and roots by as much as 64. 0% and 39. 1% , respectively; S application could significantly decrease the pH value and increase the organic matter content by as much as 0. 65 units and 1.76 g.kg-1 , respectively; S application could significantly decrease soluble Se and Fe/Mn oxide-bound Se, and significantly increase organic matter-bound Se, however, there was no remarkable effect on exchangeable and residual Se. S could significantly decrease the content of Se(IV) in the soluble Se and significantly increase the content of Se(IV) in the exchangeable Se, with remarkable decrease in Se(VI) content in both fractions, and no remarkable effect on Se(II). S had a profound effect on the uptake of Se by rape seedlings when Se( IV) and Se( VI) were applied. The Se contents in shoot and root of the Se( VI)-treated rape were 7.3 and 3.2 times respectively as high as that of the Se( IV)-treated rape, while with a S rate of 2 mmolL-1, their Se contents were lower than 32.6% and 8.7% of that of the Se(IV)-treated rape. In conclusion, in addition to improving crop growth, appropriate amount of S fertilizer could also reduce soil pH and increase organic content, causing available Se in soil to be Fe/Mn oxide-bound and organic matter-bound, and retarding its transformation to Se( VI), thus reducing Se uptake by rape. This has significant value for regulation of Se content in crops from Se-rich regions, ensuring food quality and safety, benefiting the long-term use of soil Se resources and regional economic development.
authors.forename: Xin-wei
authors.initials: XW
authors.lastname: Liu
authors.forename: Bi-huil
authors.initials: BH
authors.lastname: Duan
authors.forename: Quan-jie
authors.initials: QJ
authors.lastname: Xia
authors.forename: Wei
authors.initials: W
authors.lastname: Jiao
authors.forename: Zai-hua
authors.initials: ZH
authors.lastname: Guo
authors.forename: Cheng-xiao
authors.initials: CX
authors.lastname: Hu
authors.forename: Zhu-qing
authors.initials: ZQ
authors.lastname: Zhao
mesh_terms: D029741:Brassica rapa / Q000378:metabolism*; D018556:Crops, Agricultural / Q000378:metabolism; D004784:Environmental Monitoring; D005308:Fertilizers; D012643:Selenium / Q000378:metabolism*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000378:metabolism*; D013455:Sulfur / Q000737:chemistry*
chemical_list: D005308:Fertilizers; D012987:Soil; D012989:Soil Pollutants; D013455:Sulfur; D012643:Selenium