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Selenobacteria-mediated Se transformation and uptake involving the unique genetic code

文献类型： 外文期刊

作者： Liao, Qing 1 ; Li, Ao-Mei 1 ; Xing, Ying 1 ; Liang, Pan-Xia 1 ; Jiang, Ze-Pu 1 ; Liu, Yong-Xian 1 ; Huang, Dong-Liang 1 ;

作者机构： 1.Guangxi Acad Agr Sci, Guangxi Key Lab Arable Land Conservat, Nanning, Peoples R China

2.Guangxi Acad Agr Sci, Guangxi Key Lab Sugarcane Genet Improvement, Nanning 530007, Peoples R China

3.Guangxi Acad Agr Sci, Key Lab Sugarcane Biotechnol & Genet Improvement G, Minist Agr & Rural Affairs, Nanning, Peoples R China

关键词： selenobacteria; Se; biofortification; genome; Se activation

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.6； 五年影响因子：6.8 ）

ISSN： 1664-462X

年卷期： 2024 年 15 卷

页码：

收录情况： SCI

摘要： Selenium (Se) is a crucial micronutrient for human health. Plants are the primary source of Se for humans. Selenium in the soil serves as the primary source of Se for plants. The soil contains high total Se content in large areas in Guangxi, China. However, the available Se is low, hindering Se uptake by plants. Microorganisms play a pivotal role in the activation of Se in the soil, thereby enhancing its uptake by plants. In this study, selenobacteria were isolated from Se-rich soils in Guangxi. Then two selenobacteria strains, YLB1-6 and YLB2-1, representing the highest (30,000 mu g/mL) and lowest (10,000 mu g/mL) Se tolerance levels among the Se-tolerant bacteria, were selected for subsequent analysis. Although the two selenobacteria exhibited distinct effects, they can significantly transform Se species, resulting in a decrease in the soil residual Se (RES-Se) content while concurrently increasing the available Se (AVA-Se) content. Selenobacteria also enhance the transformation of Se valencies, with a significant increase observed in soluble Se6+ (SOL-Se6+). Additionally, selenobacteria can elevate the pH of acidic soil. Selenobacteria also promote the uptake of Se into plants. After treatment with YLB1-6 and YLB2-1, the Se content in the aboveground part of Chinese flowering cabbage increased by 1.96 times and 1.77 times, respectively, while the Se accumulation in the aboveground part of the plant significantly increased by 104.36% and 81.69%, respectively, compared to the control. Further whole-genome sequencing revealed the genetic difference between the two selenobacteria. Additionally, 46 and 38 candidate genes related to selenium utilization were identified from YLB1-6 and YLB2-1, respectively. This work accelerates our understanding of the potential molecular mechanism of Se biofortification by selenobacteria. It also provides microorganisms and gene targets for improving crop varieties or microorganisms to exploit the rich Se source in soil.

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