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

被引:9
|
作者
Liu, Han [1 ]
Cui, Yongliang [2 ]
Zhou, Jie [1 ]
Penttinen, Petri [1 ]
Liu, Jiahao [1 ]
Zeng, Lan [1 ]
Chen, Qiang [1 ]
Gu, Yunfu [1 ]
Zou, Likou [1 ]
Zhao, Ke [1 ]
Xiang, Quanju [1 ]
Yu, Xiumei [1 ]
机构
[1] Sichuan Agr Univ, Coll Resources, Chengdu, Sichuan, Peoples R China
[2] Sichuan Prov Acad Nat Resource & Sci, Chengdu, Sichuan, Peoples R China
来源
PEERJ | 2022年 / 10卷
基金
中国国家自然科学基金;
关键词
Rhizobia; Nickel mine soil; Soybean; Plant growth promoting; Diversity; Heavy metal tolerance; ROBINIA-PSEUDOACACIA; ENDOPHYTIC BACTERIA; PHYTOSTABILIZATION; BIOACCUMULATION; INOCULATION; BIOSORPTION; NODULATION; RESISTANT; POLLUTION; STRAINS;
D O I
10.7717/peerj.13215
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
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.
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页数:20
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