Bacteria from the rhizosphere of a selenium hyperaccumulator plant can improve the selenium uptake of a non-hyperaccumulator plant
文献类型： 外文期刊
作者： Zhang, Huan 1 ; Yang, Dandan 1 ; Hu, Chengxiao 1 ; Du, Xiaoping 2 ; Liang, Lianming 3 ; Wang, Xu 4 ; Shi, Guangyu 5 ; Han, Chuang 1 ; Tang, Yanni 1 ; Lei, Zheng 1 ; Yi, Ceng 1 ; Zhao, Xiaohu 1 ;
作者机构： 1.Huazhong Agr Univ, Coll Resources & Environm, Res Ctr Trace Elements, Wuhan 430070, Peoples R China
2.Minist Agr & Rural Affairs, Key Lab Se Enriched Prod Dev & Qual Control, Natl Local Joint Engn Lab Se Enriched Food Dev, Ankang 725000, Peoples R China
3.Yunnan Univ, State Key Lab Conservat & Utilizat Bioresources, Kunming 650091, Peoples R China
4.Guangdong Acad Agr Sci, Inst Qual Stand & Monitoring Technol Agroprod, Guangzhou 510640, Peoples R China
5.Suzhou Univ Sci & Technol, Coll Environm Sci & Engn, Suzhou 215009, Peoples R China
关键词： Selenium; Biofortification; Hyperaccumulator; Rhizosphere bacteria; Root exudates; Isolated bacteria
期刊名称：BIOLOGY AND FERTILITY OF SOILS （ 影响因子：5.1； 五年影响因子：6.2 ）
ISSN： 0178-2762
年卷期： 2024 年
页码：
收录情况： SCI
摘要： It is unknown whether soil microbiota and soil bacteria isolated from the rhizosphere of selenium hyperaccumulator plants can affect selenium absorption by selenium non-hyperaccumulator plants. Here, we used pot experiments and split root experiments to investigate the role of soil microbiota and isolated rhizosphere bacteria from a selenium hyperaccumulator plant (Cardamine violifolia) in affecting selenium absorption by a selenium non-hyperaccumulator plant (Brassica napus), combining root metabolism analysis, microbiome profiling, strain isolation and its selenium absorption functional validation. We found that soil microbiota of Cardamine violifolia significantly increased the root selenium content by 31.8% and regulated root exudation by Brassica napus. Additionally, the application of upregulated long-chain organic acids + amino acids, long-chain organic acids + short-chain organic acids, ethanolamine, and 2-ketobutyric acid increased the selenium contents in the roots of Brassica napus by 69.6%, 38.4%, 81.2%, and 48.8%, respectively. Further investigation revealed that dominant bacteria were significantly enriched in the rhizosphere of C. violifolia compared to B. napus. After that, we isolated the rhizosphere bacteria of Cardamine violifolia and observed that Bacillus sp.-2, Chryseobacterium sp., and Pseudomonas sp., as well as their combined communities, significantly improved selenium absorption in Brassica napus. Moreover, the combined bacterial communities significantly regulated specific-root metabolism, enhanced rhizosphere soil available selenium content, promoted root development, increased expression levels of genes encoding selenium transporter in root. These findings provide insights into utilizing rhizosphere bacteria of selenium hyperaccumulator plants to increase selenium absorption by non-hyperaccumulator plants.
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