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Fe (III) 依赖的 Nrf 活动决定了酸盐降低在酸盐降低社区的划分

Ji Zhan¹, Lu Zhang¹, Shuyao Lai¹

¹Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, China.

|September 30, 2025

概括

铁的可用性 (Fe ((III)) 控制微生物循环,有利于在丰富时降低酸盐到氨 (DNRA) 和稀缺时脱化. 这一发现为管理生态系统中气损失提供了新的策略.

科学领域:

微生物生态学微生物生态学
环境微生物学环境微生物学
生物地质化学生物地质化学

背景情况:

通过微生物过程 (如脱) 来从生态系统中丧失气对农业产生影响,并导致温室气体排放.
分离性酸盐降解为 (DNRA) 为保留提供了一条途径,但控制其优先考虑脱的因素尚未完全理解.
环境营养状况,例如碳比,传统上被认为是酸盐减少途径的主要驱动因素.

研究的目的:

调查Fe (III) 可用性在调节酸盐降解中的作用,在DNRA和脱化之间进行分离.
为了阐明微生物机制控制Fe(III) 依赖的酸盐降解途径在共同培养系统.
在自然环境样本中验证Fe (III) 对DNRA活性的影响.

主要方法:

在不同的Fe (III) 可用性下培养Geobacter metallireducens和Alcaligenes faecalis共同培养.
监测转化动态和微生物群落组成.
酶活性测定 (酸盐/酸盐减少酶) 和基因突变分析.
使用城市河水样本进行实验验证.

主要成果:

铁III的可用性决定了酸盐的减少途径:在铁III充足的条件下 (由*G.metallireducens*驱动) DNRA占主导地位,而在铁III枯竭的条件下 (物种间协同作用) 脱化占主导地位.
在*G.metallireducens*中,酸盐还原酶 (Nrf) 活性被确定为控制酸盐还原分区的关键Fe (III) 依赖因子.
(III) 补充剂显著增强了DNRA在城市河水中的活动,证实了其在现场的监管作用.

结论:

铁 (Fe) 是微生物留的关键,以前未被认可的调节器,影响DNRA和脱化之间的平衡.
了解Fe (III) 的作用为减轻农业和水生环境中气损失提供了新的策略.
这项研究将微生物生态学与环境管理联系起来,突出显示微量金属对生态系统健康营养循环的影响.

关键词:

铁 (III) 辅因子脱化过程中的化.不同化酸降解为.跨物种协同作用的脱化酸盐还原酶可以减少酸盐.的转化的转化

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