Contrasting effects of elevated CO2 on autotrophic prokaryotes with different CO2 fixation strategies in tea plantation soil

文献类型： 外文期刊

第一作者： Shi, Man

作者： Shi, Man;Song, Xinzhang;Shi, Man;Li, Jiangye;Gao, Ruonan;Gao, Yan;Yan, Shaohua;Shi, Man;Wang, Guibin;Li, Jiangye;Gao, Yan;Yan, Shaohua

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关键词： Elevated CO2 concentration; Microbial CO2 fixation; Autotrophic prokaryotes; Nitrifying prokaryotes; Tea trees

期刊名称：BIOLOGY AND FERTILITY OF SOILS （ 影响因子：6.5； 五年影响因子：6.9 ）

ISSN： 0178-2762

年卷期： 2023 年 59 卷 2 期

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收录情况： SCI

摘要： Autotrophic microbes play an important role in CO2 fixation and carbon (C) cycle in different soils; however, their response to elevated atmospheric CO2 concentration (eCO(2)) is still unclear in tea plantation soils. We designed a microcosm experiment to investigate the effects of eCO(2) on autotrophic prokaryotes with different CO2 fixation strategies in the soil, with or without the presence of tea trees. The eCO(2) increased the abundance of cbbL IA & IC and cbbL ID genes of the Calvin-Benson-Bassham (CBB) cycle without any significant effect on the abundance of cbbM and pufM genes in the soil, with or without the presence of tea trees. The relative abundance of cbbL-harboring bacteria, such as Gammaproteobacteria rather than that of ammonia-oxidizing and photoautotrophic bacteria, which used the CBB cycle for CO2 assimilation, increased under eCO(2). In contrast, eCO(2) decreased the abundance of accA and aclA-nitro genes of the 3-hydroxypropionate/4-hydroxybutyrate (3HP/4HB) and reductive TCA (rTCA) cycles in autotrophic prokaryotes with or without the presence of tea trees. Relative abundances of autotrophic Crenarchaeota (Thaumarchaeota), which used the 3HP/4HB cycle, nitrite-oxidizing bacteria, Comammox, and sulfur-reducing bacteria which used the rTCA cycle for CO2 fixation, decreased under eCO(2). In addition, eCO(2) altered the functioning of inorganic C fixation in the microbial community, regardless of the presence or absence of tea trees. However, plant growth could enhance the effects of eCO(2) on specific autotrophic prokaryotes such as Nitrospirota phyla, Gammaproteobacteria class, and Rhizobiales order.

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