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Histidine Kinase PhoQ Is a Critical Regulator for Selenium Metabolism in Rahnella aquatilis HX2 and Enhances Selenium Bioavailability in Soil

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Abstract

PhoP/PhoQ, the two-component regulatory system, plays a significant role in regulating the functions of many Gram-negative bacteria. This study investigated the function of PhoQ in Rahnella aquatilis HX2. The study generated a mutant HX2ΔphoQ with an in-frame deletion within the phoQ gene in R. aquatilis HX2. The effect of phoQ gene on HX2 selenium (Se) metabolism was investigated by the pure culture method, and the expression of Se metabolism–related genes was detected by real-time quantitative PCR (RT-qPCR). Wild-type HX2 and mutant HX2ΔphoQ were used to treat soil to explore the effects of soil Se cycling, plant growth, and Se uptake. Compared to the wild type, the phoQ mutation lowered Se absorption and selenium nanoparticles (SeNPs) production but increased Se-methyl-selenocysteine (MeSeCys) content in the bacterial pellets. PhoQ significantly influenced the expression of pitA, cysA, hfq, and rsmJ genes involved in Se transport, metabolism, and methylation. In soils supplemented with selenite [Se(IV)], compared with the control, the bioavailability of Se was improved by HX2. The Se levels in plant shoots also significantly increased with HX2 treatment compared with the control. In addition, the residual Se (RES-Se) content increased substantially in soil treated with HX2ΔphoQ compared with HX2-treated soil, while the root biomass and plant Se content decreased. Rahnella aquatilis HX2 alters Se bioavailability in soil and ultimately changes the uptake of Se by plants. The findings of this study indicate that the phoQ gene plays a vital role in Se metabolism in bacteria and Se conversion in soil.

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Funding

This work was supported by the National Natural Science Foundation of China (31470531) and Special Fund for Key Science & Technology Program in Yunnan Province (No. 202202AE090029).

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Yanbin Guo, Jing Peng, and Wei Wang conceived the study. Zhongnan Xu, Jing Peng, Wei Wang, and Qing Zhao performed the experiment. Zhongnan Xu, Jing Peng, and Wei Wang analyzed the data. Zhongnan Xu and Jing Peng wrote the manuscript.

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Correspondence to Yanbin Guo.

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Xu, Z., Peng, J., Wang, W. et al. Histidine Kinase PhoQ Is a Critical Regulator for Selenium Metabolism in Rahnella aquatilis HX2 and Enhances Selenium Bioavailability in Soil. J Soil Sci Plant Nutr 23, 4066–4077 (2023). https://doi.org/10.1007/s42729-023-01324-1

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  • DOI: https://doi.org/10.1007/s42729-023-01324-1

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