Bacillus sp. Z2 immobilized rare earth yttrium and reduced the absorption of Y in rice
WANG Wei-ying1, XU Cheng-long1, CHEN Ying-ying1, ZHU Du1,2
1. Key Laboratory of Protection and Utilization of Subtropical Plant Resources of Jiangxi Province, College of Life Sciences, Jiangxi Normal University, Nanchang 330022, China; 2. Key Laboratory of Bioprocess Engineering of Jiangxi Province, College of Life Science and Technology Normal University, Nanchang 330013, China
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.
王伟英, 徐成龙, 陈盈盈, 朱笃. Bacillus sp. Z2对稀土钇的固定及阻控水稻吸收效应[J]. 中国环境科学, 2023, 43(2): 927-934.
WANG Wei-ying, XU Cheng-long, CHEN Ying-ying, ZHU Du. Bacillus sp. Z2 immobilized rare earth yttrium and reduced the absorption of Y in rice. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(2): 927-934.
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