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气候历史调节了常见的土壤细菌在实验干旱下的应激反应

Nicholas J Bouskill^1,2, Stephany S Chacon^1,3, Daniela F Cusack^4,5

¹Climate and Ecosystem Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States.

The ISME journal

|April 18, 2025

概括

土壤细菌表现出各种干旱反应,受到进化历史和气候的影响. 与热带分离物相比,半干旱细菌对透和矩阵应激的代谢适应性更强.

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
生物化学生化学

背景情况:

土壤干燥显著影响微生物的生存,促使细菌激活各种应激反应机制,如休眠或 osmoprotectant 生产.
细菌系谱和环境气候历史对这些压力反应的影响在很大程度上仍未被描述.

研究的目的:

为了研究不同气候 (半干旱与潮湿的热带) 的类遗传学上相似的细菌如何对透和矩阵应激做出反应.
阐明植物遗传学和气候历史在塑造细菌干旱适应策略中的作用.

主要方法:

利用基于同步子辐射的里埃变换红外光谱显微镜 (SR-FTIR) 用于对整个细菌细胞的非破坏性生物化学表型.
在受控,透和矩阵应激条件下,从半干旱和潮湿的热带土壤中比较细菌的反应.

主要成果:

透应激诱导了显著的细菌反应,包括细胞信号的上调,脂质周转和透酸盐的产生.
矩阵压力引起的反应不那么明显,主要涉及碳水化合物压力化合物的升高,如糖氨酸,贝他因和三糖.
来自半干旱环境的细菌与来自潮湿的热带土壤的细菌相比,表现出更强的代谢应激反应,尽管有遗传学上的相似性.

结论:

细菌对土壤干燥的反应比以前理解的要多样化.
细菌系谱和长期气候历史都是土壤微生物干旱应激适应的关键调节者.

关键词:

气候历史气候历史干旱造成的压力是干旱.脂质储存和储存的方法氧化物溶解物是什么实时代谢测量实时代谢测量

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