Selenate Reduction and Selenium Enrichment of Tea by the Endophytic Herbaspirillum sp. Strain WT00C
文献类型： 外文期刊
作者： Xu, Xiao 1 ; Cheng, Wei 1 ; Liu, Xin 1 ; You, Heng 1 ; Wu, Guitai 2 ; Ding, Kunming 3 ; Tu, Xiuliang 3 ; Yang, Lanfang 4 ; W 1 ;
作者机构： 1.Hubei Univ, Fac Life Sci, Wuhan, Peoples R China
2.Hubei Univ, Fac Phys & Elect Sci, Wuhan, Peoples R China
3.Xianning Acad Agr Sci, Xianning, Hubei, Peoples R China
4.Hubei Univ, Fac Resource & Environm Sci, Wuhan, Peoples R China
5.Hubei Acad Agr Sci, Wuhan, Peoples R China
期刊名称：CURRENT MICROBIOLOGY （ 影响因子：2.188； 五年影响因子：2.197 ）
ISSN： 0343-8651
年卷期： 2020 年 77 卷 4 期
页码：
收录情况： SCI
摘要： Herbaspirillum sp. WT00C is a tea-plant-specific endophytic bacterium. A genomic survey revealed an intact pathway for selenocompound metabolism in the genome of this bacterium. When it was cultured with sodium selenate, Herbaspirillum sp. WT00C was able to turn the culture medium to red. Electron microscopy and energy-dispersive X-ray spectroscopy confirmed that Herbaspirillum sp. WT00C reduced selenite (Se6+) to elemental selenium (Se-0), and selenium nanoparticles (SeNPs) were secreted outside bacterial cells and grew increasingly larger to form Se-nanospheres and finally crystallized to form selenoflowers. Biochemical assays showed that selenospheres contained proteins but not carbohydrates or lipids. The improvement of selenium enrichment of tea plants by Herbaspirillum sp. WT00C was also tested. After Herbaspirillum sp. WT00C was inoculated into tea seedlings via needle injection and soaking tea-cutting methods, this endophytic bacterium markedly enhanced selenium enrichment of tea. When the tea seedlings inoculated by soaking tea-cutting mode were cultivated in the selenium-containing soils, selenium contents of tea leaves in three experimental groups were more than twofold compared to those of control groups. Our study demonstrates that the endophytic bacterium Herbaspirillum sp. WT00C has the ability to reduce selenate and improve selenium enrichment of tea.
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