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Antimony-oxidizing bacteria alleviate Sb stress in Arabidopsis by attenuating Sb toxicity and reducing Sb uptake
Plant and Soil ( IF 3.9 ) Pub Date : 2020-06-03 , DOI: 10.1007/s11104-020-04569-2
Tianyuan Gu , Huang Yu , Fang Li , Weimin Zeng , Xueling Wu , Li Shen , Runlan Yu , Yuandong Liu , Jiaokun Li

Aims Antimony (Sb)-oxidizing bacteria play an important role in Sb biogeochemical cycle in soil, but the benefits of microbial oxidation for plants have not been well documented. The aim of this study was to explore the contribution of Sb(III)-oxidizing bacteria to alleviate the Sb toxicity in plants. Methods The plant growth-promoting (PGP) characteristics of Sb(III)-oxidizing bacterium Bacillus sp. S3 and the effects of bacterial inoculation on Arabidopsis plants were evaluated under controlled and Sb stressed conditions. Results Indole acetic acid (IAA) production and 1-aminocyclopropane-1-carboxylate-deaminase (ACC-deaminase) activity were the only two PGP strategies that Bacillus sp. S3 possessed, despite the production level of IAA and the activity of ACC deaminase sharply decreased under Sb stress. Bacillus sp. S3 inoculation significantly increased the plant biomass and chlorophyll content, alleviated the peroxidation of membrane lipids, decreased the activities of the antioxidant enzymes, and reduced the transcription of Sb transporters and reactive oxygen species (ROS)-related enzymes in Arabidopsis. Noteworthily, inoculation of Bacillus sp. S3 not only significantly decreased the Sb accumulation but also reduced the percentage of Sb(III) of total Sb in Arabidopsis. Conclusions This study indicates that the Sb(III)-oxidizing strain of Bacillus sp. S3 is a promising inoculant used for bacteria-assisted phytoremediation on Sb-contaminated sites.

中文翻译:

锑氧化细菌通过减弱 Sb 毒性和减少 Sb 吸收来缓解拟南芥中的 Sb 胁迫

目的 锑 (Sb) 氧化细菌在土壤中的 Sb 生物地球化学循环中发挥重要作用,但微生物氧化对植物的益处尚未得到充分证明。本研究的目的是探索 Sb(III) 氧化细菌对减轻植物中 Sb 毒性的贡献。方法 Sb(III)氧化细菌芽孢杆菌的植物生长促进(PGP)特性。在受控和 Sb 胁迫条件下评估 S3 和细菌接种对拟南芥植物的影响。结果 吲哚乙酸 (IAA) 生产和 1-氨基环丙烷-1-羧酸脱氨酶(ACC-脱氨酶)活性是芽孢杆菌属的仅有的两种 PGP 策略。S3 具有,尽管 IAA 的产生水平和 ACC 脱氨酶的活性在 Sb 胁迫下急剧下降。芽孢杆菌 S3 接种显着增加了植物生物量和叶绿素含量,减轻了膜脂的过氧化,降低了抗氧化酶的活性,并减少了拟南芥中 Sb 转运蛋白和活性氧 (ROS) 相关酶的转录。值得注意的是,芽孢杆菌的接种。S3 不仅显着降低了 Sb 的积累,而且还降低了 Sb(III) 在拟南芥中总 Sb 的百分比。结论 本研究表明芽孢杆菌属的 Sb(III) 氧化菌株。S3 是一种很有前途的接种剂,用于在 Sb 污染部位进行细菌辅助植物修复。并减少拟南芥中 Sb 转运蛋白和活性氧 (ROS) 相关酶的转录。值得注意的是,芽孢杆菌的接种。S3 不仅显着降低了 Sb 的积累,而且还降低了 Sb(III) 在拟南芥中总 Sb 的百分比。结论 本研究表明芽孢杆菌属的 Sb(III) 氧化菌株。S3 是一种很有前途的接种剂,用于在 Sb 污染部位进行细菌辅助植物修复。并减少拟南芥中 Sb 转运蛋白和活性氧 (ROS) 相关酶的转录。值得注意的是,芽孢杆菌的接种。S3 不仅显着降低了 Sb 的积累,而且还降低了 Sb(III) 在拟南芥中总 Sb 的百分比。结论 本研究表明芽孢杆菌属的 Sb(III) 氧化菌株。S3 是一种很有前途的接种剂,用于在 Sb 污染部位进行细菌辅助植物修复。
更新日期:2020-06-03
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