寻找卤代嗜碱性蓝藻生长的 pH 值极限。

IF 3.6 4区 生物学 Q2 ENVIRONMENTAL SCIENCES Environmental Microbiology Reports Pub Date : 2024-08-11 DOI:10.1111/1758-2229.13323
Lianchun Yi, Ruchita Solanki, Marc Strous
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引用次数: 0

摘要

蓝藻有许多生物技术应用。提高其培养 pH 值有助于捕获二氧化碳和避免其他生物入侵。然而,碱性培养基可能会对蓝藻产生不利影响,如降低碳浓缩机制的效率。在这里,我们在 pH 值为 10.2-11.4 的恒温器中培养了两个卤代嗜碱性蓝藻联合体。其中一个联合体以 Ca.Sodalinema alkaliphilum为主,另一个则以一种 Nodosilinea 为主。这两种蓝藻在加拿大和亚洲碱性苏打湖的自然群落中占主导地位。我们的研究表明,pH 值升高会降低生物量产量。这种减少的部分原因是向异养生物的碳转移急剧增加。当 pH 值为 11.4 时,蓝藻的生长受到碳酸氢盐吸收的限制,而碳酸氢盐的吸收主要依赖于 ATP。同时,pH 值越高,蓝藻对光越敏感,导致光抑制和 DNA 修复系统上调。
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In search of the pH limit of growth in halo-alkaliphilic cyanobacteria

Cyanobacteria have many biotechnological applications. Increasing their cultivation pH can assist in capturing carbon dioxide and avoiding invasion by other organisms. However, alkaline media may have adverse effects on cyanobacteria, such as reducing the Carbon-Concentrating Mechanism's efficiency. Here, we cultivated two halo-alkaliphilic cyanobacteria consortia in chemostats at pH 10.2–11.4. One consortium was dominated by Ca. Sodalinema alkaliphilum, the other by a species of Nodosilinea. These two cyanobacteria dominate natural communities in Canadian and Asian alkaline soda lakes. We show that increasing the pH decreased biomass yield. This decrease was caused, in part, by a dramatic increase in carbon transfer to heterotrophs. At pH 11.4, cyanobacterial growth became limited by bicarbonate uptake, which was mainly ATP dependent. In parallel, the higher the pH, the more sensitive cyanobacteria became to light, resulting in photoinhibition and upregulation of DNA repair systems.

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来源期刊
Environmental Microbiology Reports
Environmental Microbiology Reports ENVIRONMENTAL SCIENCES-MICROBIOLOGY
CiteScore
6.00
自引率
3.00%
发文量
91
审稿时长
3.0 months
期刊介绍: The journal is identical in scope to Environmental Microbiology, shares the same editorial team and submission site, and will apply the same high level acceptance criteria. The two journals will be mutually supportive and evolve side-by-side. Environmental Microbiology Reports 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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