揭示了格拉姆阳性细菌在米土壤中减少铁的低估作用

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¹College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China; National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangdong Key Laboratory of Integrated Agro-Environmental Pollution Control and Management, Institute of Eco-Environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China.

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概括

格拉姆阳性细菌,通常被忽视为弱的外电原体,大大有助于在米土壤中减少铁. 它们的高丰度弥补了较慢的速度,揭示了它们在营养循环中的低估作用.

科学领域:

微生物学微生物学
环境科学环境科学
生物地质化学生物地质化学

背景情况:

田中铁的减少影响了重金属的迁移和营养循环.
格拉姆阴性细菌 (例如,Geobacter,Shewanella) 已知具有强大的细胞外电子转移.
格拉姆阳性细菌 (如Bacillus,Clostridium) 通常被认为是弱的外电原体,其作用可能被低估.

研究的目的:

调查格拉姆阳性细菌对在米土壤中减少铁的贡献.
为了在不同条件下比较铁的减少率和格拉姆阳性和格拉姆阴性细菌的丰富性.

主要方法:

用葡萄糖丰富米土壤,以有利于格兰阳性细菌.
葡萄糖丰富土壤中的铁减少率与乙酸盐和乳酸盐系统的比较.
纯培养实验以确定特定细菌种的铁减少率.
在天然的土中量化格兰正和格兰负的减铁剂.

主要成果:

葡萄糖的丰富导致了格拉姆阳性细菌 (Clostridiaceae,Bacillaceae) 的优势.
尽管个体比率较低,但高丰度的格拉姆阳性细菌导致铁的减少率与具有更多格拉姆阴性细菌的系统相美.
纯培养表明,Bacillus和Clostridium的铁减少率明显低于Geobacter.
在天然的土中,阳性降铁剂的含量是阳性降铁剂的9倍.

结论:

尽管格拉姆阳性细菌是弱的外电原体,但由于它们的大量存在,它们在米土壤的铁减少中起着重要作用.
格拉姆阳性细菌对大米土壤中铁减少的贡献被低估了.
米土壤环境中存在独特的微生物群落,其中格兰正细菌是生物地化学过程中的关键参与者.

关键词:

细菌杆菌是一种细菌.克洛斯特里迪亚姆 (Clostridium) 是一种格拉姆阳性细菌是什么?铁的减少铁的减少微弱的外电原体是弱的外电原体.

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