<i>Bacillus</i> sp. Z2对稀土钇的固定及阻控水稻吸收效应

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Abstract A rhizosphere growth-promoting bacterium Z2 resistant to yttrium (Y) was isolated from the rare earth mining area in southern Jiangxi Province. It was identified as Bacillus sp., which could effectively reduce the bioavailability of Y³⁺under shake-flask fermentation. The mechanism may be the combined effect of bacterial adsorption, pH increasing and active metabolite which can bind with Y³⁺. In pot experiment, Z2 could significantly reduce the accumulation of Y in rice root by 49% (P<0.05) and 43% (P<0.01) under 0.08 and 0.35mmol/L Y³⁺treatment conditions, respectively. Phytochelatin was responsive to the increase of yttrium content in rice roots, metallothionein and glutathione s-transferase did not change significantly. The results indicated that Z2 could be used as a potential strain resource in the remediation of rare-earth contaminated farmland and in the safe production of rice.

Key words： rare earth yttrium plant growth-promoting rhizobactera immobilization rice

Received: 13 July 2022

PACS:	X171
	X172

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	WANG Wei-ying
	XU Cheng-long
	CHEN Ying-ying
	ZHU Du

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WANG Wei-ying,XU Cheng-long,CHEN Ying-ying等. Bacillus sp. Z2 immobilized rare earth yttrium and reduced the absorption of Y in rice[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(2): 927-934.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I2/927

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