细菌和真菌对干旱对盐碱地溪流中马尾松木质茎分解的不同反应。

IF 4.3 2区 生物学 Q2 MICROBIOLOGY Environmental microbiology Pub Date : 2024-06-07 DOI:10.1111/1462-2920.16661
Anna Doménech-Pascual, Lorena Carrasco-Barea, Frederic Gich, Judit Boadella, Zeus Freixinos Campillo, Rosa Gómez Cerezo, Andrea Butturini, Anna M. Romaní
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引用次数: 0

摘要

内陆盐碱生态系统承受着多重压力(如高辐射、盐度、缺水),这可能会损害生态系统的基本功能,如有机物分解。在这里,我们研究了干旱对盐碱流域不同生境中马尾藻木质茎的微生物定殖和分解的影响:在干燥的洪泛平原、浸没在河道中以及在海岸线上(先浸没,后浮出水面)。出乎意料的是,沉水茎的重量损失并没有增加,而不同生境的分解过程却各不相同。在冲积平原上,主要是真菌和高纤维素分解活性;在淹没条件下,主要是多样化的细菌群落和高木质素分解活性;而在海岸线上,酶活性与淹没条件相同,但真菌群落与干燥条件相似。结果表明,不同的压力因素驱动着不同的降解路径:在干燥条件下,强烈缺水和光降解;在潮湿条件下,高盐度和氧气减少。这表明真菌对干旱的抵抗力更强,而细菌对盐度的抵抗力更强。总之,在盐碱流域,多种压力因素的变化对细菌和真菌及其在植物物质分解中的作用产生了不同的环境过滤作用,影响了碳循环和微生物之间的相互作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Differential response of bacteria and fungi to drought on the decomposition of Sarcocornia fruticosa woody stems in a saline stream

Inland saline ecosystems suffer multiple stresses (e.g., high radiation, salinity, water scarcity) that may compromise essential ecosystem functions such as organic matter decomposition. Here, we investigated the effects of drought on microbial colonization and decomposition of Sarcocornia fruticosa woody stems across different habitats in a saline watershed: on the dry floodplain, submerged in the stream channel and at the shoreline (first submerged, then emerged). Unexpectedly, weight loss was not enhanced in the submerged stems, while decomposition process differed between habitats. On the floodplain, it was dominated by fungi and high cellulolytic activity; in submerged conditions, a diverse community of bacteria and high ligninolytic activity dominated; and, on the shoreline, enzyme activities were like submerged conditions, but with a fungal community similar to the dry conditions. Results indicate distinct degradation paths being driven by different stress factors: strong water scarcity and photodegradation in dry conditions, and high salinity and reduced oxygen in wet conditions. This suggests that fungi are more resistant to drought, and bacteria to salinity. Overall, in saline watersheds, variations in multiple stress factors exert distinct environmental filters on bacteria and fungi and their role in the decomposition of plant material, affecting carbon cycling and microbial interactions.

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来源期刊
Environmental microbiology
Environmental microbiology 环境科学-微生物学
CiteScore
9.90
自引率
3.90%
发文量
427
审稿时长
2.3 months
期刊介绍: Environmental Microbiology provides a high profile vehicle for publication of the most innovative, original and rigorous research in the field. The scope of the Journal encompasses the diversity of current research on microbial processes in the environment, microbial communities, interactions and evolution and includes, but is not limited to, the following: the structure, activities and communal behaviour of microbial communities microbial community genetics and evolutionary processes microbial symbioses, microbial interactions and interactions with plants, animals and abiotic factors microbes in the tree of life, microbial diversification and evolution population biology and clonal structure microbial metabolic and structural diversity microbial physiology, growth and survival microbes and surfaces, adhesion and biofouling responses to environmental signals and stress factors modelling and theory development pollution microbiology extremophiles and life in extreme and unusual little-explored habitats element cycles and biogeochemical processes, primary and secondary production microbes in a changing world, microbially-influenced global changes evolution and diversity of archaeal and bacterial viruses new technological developments in microbial ecology and evolution, in particular for the study of activities of microbial communities, non-culturable microorganisms and emerging pathogens
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