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The ISME Journal:干旱和植物凋落物化学成分影响微生物的基因表达和代谢产量

已有 353 次阅读 2020-5-26 08:35 |个人分类:每日摘要|系统分类:论文交流

Drought and plant litter chemistry alter microbial gene expression and metabolite production

第一作者Ashish A. Malik

第一单位美国加州大学欧文分校

通讯作者Ashish A. Malik


 Abstract 


提出问题Drought represents a significant stress to microorganisms and is known to reduce microbial activity and organic matter decomposition in Mediterranean ecosystems. 


就坐提出问题:However, we lack a detailed understanding of the drought stress response of microbial decomposers.


研究方向:Here we present metatranscriptomic and metabolomic data on the physiological response of in situ microbial communities on plant litter to long-term drought in Californian grass and shrub ecosystems.


提出假设:We hypothesised that drought causes greater microbial allocation to stress tolerance relative to growth pathways.


结果1-草类系统:In grass litter, communities from the decade-long ambient and reduced precipitation treatments had distinct taxonomic and functional profiles. The most discernable physiological signatures of drought were production or uptake of compatible solutes to maintain cellular osmotic balance, and synthesis of capsular and extracellular polymeric substances as a mechanism to retain water. The results show a clear functional response to drought in grass litter communities with greater allocation to survival relative to growth that could affect decomposition under drought.

结果1-灌木系统:In contrast, communities on chemically more diverse and complex shrub litter had smaller physiological differences in response to long-term drought but higher investment in resource acquisition traits across precipitation treatments, suggesting that the functional response to drought is constrained by substrate quality.


结论:Our findings suggest, for the first time in a field setting, a trade off between microbial drought stress tolerance, resource acquisition and growth traits in plant litter microbial communities.


 摘  要 


干旱对于微生物来说,是一个比较恶劣的非生物胁迫,能够降低地中海生态系统中微生物的活力及有机物的分解。然而,目前对于微生物应对干旱胁迫时的响应方面的知识仍旧缺乏。本文中,作者通过宏转录组及代谢物数据,解析了加州草丛和灌木生态系统中,在长期干旱胁迫下,植物凋落物上的原位微生物组成的生理响应。作者假设相对于生长途径而言,干旱导致了微生物会更多的将资源分配给了胁迫耐性。在草类凋落物中,经过长达十年的环境和减雨处理后,微生物群落具有独特的种类和功能特征。干旱所引起的微生物最明显的生理特征是产生或吸收相容溶质来维持细胞的渗透平衡,以及合成荚膜和胞外聚合物来保持水分。结果表明,草地凋落物的微生物群落对于干旱具有十分明显的功能响应,相对于生长需要,会将更多的资源分配给生存需要,这可能会影响干旱条件下的凋落物分解。相比之下,化学多样性更高并且更加复杂的灌木凋落物上,微生物群落对长期干旱的生理差异较小,但在降水处理后,这类微生物对资源获取性状的投入更高。这些结果说明微生物对干旱的功能响应受到基质种类的限制。本文的研究首次居于田间试验结果,揭示了一个植物凋落物微生物群落中,微生物对于干旱胁迫的耐受性与资源获取以及生长性状之间的权衡。


 通讯作者 


**Ashish A. Malik**


个人简介:

2011-2014年,德国马克斯·普朗克生物地球化学研究所,博士;

2014-2015年,德国马克斯·普朗克生物地球化学研究所,博后;

2017-2019年,美国加州大学欧文分校,博后。


研究方向:微生物生理和生物多样性与土壤碳循环之间的关联。



doi: 10.1038/s41396-020-0683-6


Journal: The ISME Journal

Published date: May 22, 2020


p.s. 植物-微生物相关研究:




http://blog.sciencenet.cn/blog-3158122-1234970.html

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