Cadmium-absorptive Bacillus vietnamensis 151-6 reduces the grain cadmium accumulation in rice (Oryza sativa L.): Potential for cadmium bioremediation

文献类型: 外文期刊

第一作者: Yu, Xiaoxia

作者: Yu, Xiaoxia;Xiong, Feng;Zhao, JinTong;Ding, Zundan;Liu, Xiaoqing;Tian, Jian;Wu, Ningfeng;Tian, Jian

作者机构: East China Univ Technol, Sch Water Resources & Environm Engn, Nanchang 330000, Jiangxi, Peoples R China;Chinese Acad Agr Sci, Biotechnol Res Inst, Beijing 100081, Peoples R China;Chinese Acad Agr Sci, Inst Anim Sci, Beijing 100193, Peoples R China

关键词: Microbial bioremediation; Cadmium accumulation; Plant growth -promoting bacteria; Rice

期刊名称:ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY ( 2022影响因子:6.8; 五年影响因子:6.9 )

ISSN: 0147-6513

年卷期: 2023 年 254 卷

页码:

收录情况: SCI

摘要: Microbial bioremediation of heavy metal-polluted soil is a promising technique for reducing heavy metal accumulation in crops. In a previous study, we isolated Bacillus vietnamensis strain 151-6 with a high cadmium (Cd) accumulation ability and low Cd resistance. However, the key gene responsible for the Cd absorption and bioremediation potential of this strain remains unclear. In this study, genes related to Cd absorption in B. vietnamensis 151-6 were overexpressed. A thiol-disulfide oxidoreductase gene (orf4108) and a cytochrome C biogenesis protein gene (orf4109) were found to play major roles in Cd absorption. In addition, the plant growth -promoting (PGP) traits of the strain were detected, which enabled phosphorus and potassium solubilization and indole-3-acetic acid (IAA) production. Bacillus vietnamensis 151-6 was used for the bioremediation of Cd-polluted paddy soil, and its effects on growth and Cd accumulation in rice were explored. The strain increased the panicle number (114.82%) and decreased the Cd content in rice rachises (23.87%) and grains (52.05%) under Cd stress, compared with non-inoculated rice in pot experiments. For field trials, compared with the non-inoculated control, the Cd content of grains inoculated with B. vietnamensis 151-6 was effectively decreased in two culti-vars (low Cd-accumulating cultivar: 24.77%; high Cd-accumulating cultivar: 48.85%) of late rice. Bacillus viet-namensis 151-6 encoded key genes that confer the ability to bind Cd and reduce Cd stress in rice. Thus, B. vietnamensis 151-6 exhibits great application potential for Cd bioremediation.

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