Nickel mine soil is a potential source for soybean plant growth promoting and heavy metal tolerant rhizobia

PeerJ

article

Han Liu¹  Yongliang Cui²  Jie Zhou¹  Petri Penttinen¹  Jiahao Liu¹  Lan Zeng¹  Qiang Chen¹  Yunfu Gu¹  Likou Zou¹  Ke Zhao¹  Quanju Xiang¹  Xiumei Yu¹ 

[1] College of Resources, Sichuan Agricultural University;Sichuan Provincial Academy of Natural Resource and Sciences

关键词: Rhizobia;    Nickel mine soil;    Soybean;    Plant growth promoting;    Diversity;    Heavy metal tolerance;   

DOI  :  10.7717/peerj.13215

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

Mine soil is not only barren but also contaminated by some heavy metals. It is unclear whether some rhizobia survived under extreme conditions in the nickel mine soil. Therefore, this study tries to isolate some effective soybean plant growth promoting and heavy metal resistant rhizobia from nickel mine soil, and to analyze their diversity. Soybean plants were used to trap rhizobia from the nickel mine soil. A total of 21 isolates were preliminarily identified as rhizobia, which were clustered into eight groups at 87% similarity level using BOXA1R-PCR fingerprinting technique. Four out of the eight representative isolates formed nodules on soybean roots with effectively symbiotic nitrogen-fixing and plant growth promoting abilities in the soybean pot experiment. Phylogenetic analysis of 16S rRNA, four housekeeping genes (atpD-recA-glnII-rpoB) and nifH genes assigned the symbiotic isolates YN5, YN8 and YN10 into Ensifer xinjiangense and YN11 into Rhizobium radiobacter, respectively. They also showed different tolerance levels to the heavy metals including cadmium, chromium, copper, nickel, and zinc. It was concluded that there were some plant growth promoting and heavy metal resistant rhizobia with the potential to facilitate phytoremediation and alleviate the effects of heavy metals on soybean cultivation in nickel mine soil, indicating a novel evidence for further exploring more functional microbes from the nickel mine soil.

【 授权许可】

CC BY