干旱区生态环境知识资源中心(Arid): Hydrogen-Oxidizing Bacteria Are Abundant in Desert Soils and Strongly Stimulated by Hydration

Arid

DOI	10.1128/mSystems.01131-20
	Hydrogen-Oxidizing Bacteria Are Abundant in Desert Soils and Strongly Stimulated by Hydration
	Jordaan, Karen; Lappan, Rachael; Dong, Xiyang; Aitkenhead, Ian J.; Bay, Sean K.; Chiri, Eleonora; Wieler, Nimrod; Meredith, Laura K.; Cowan, Don A.; Chown, Steven L.; Greening, Chris
通讯作者	Greening, C (corresponding author), Monash Univ, Sch Biol Sci, Clayton, Vic, Australia. ; Cowan, DA (corresponding author), Univ Pretoria, Ctr Microbial Ecol & Genom, Dept Biochem Genet & Microbiol, Pretoria, South Africa. ; Greening, C (corresponding author), Monash Univ, Biomed Discovery Inst, Dept Microbiol, Clayton, Vic, Australia.
来源期刊	MSYSTEMS
ISSN	2379-5077
出版年	2020
卷号	5 期号:6
英文摘要	How the diverse bacterial communities inhabiting desert soils maintain energy and carbon needs is much debated. Traditionally, most bacteria are thought to persist by using organic carbon synthesized by photoautotrophs following transient hydration events. Recent studies focused on Antarctic desert soils have revealed, however, that some bacteria use atmospheric trace gases, such as hydrogen (H-2), to conserve energy and fix carbon independently of photosynthesis. In this study, we investigated whether atmospheric H-2 oxidation occurs in four nonpolar desert soils and compared this process to photosynthesis. To do so, we first profiled the distribution, expression, and activities of hydrogenases and photosystems in surface soils collected from the South Australian desert over a simulated hydrationdesiccation cycle. Hydrogenase-encoding sequences were abundant in the metagenomes and metatranscriptomes and were detected in actinobacterial, acidobacterial, and cyanobacterial metagenome-assembled genomes. Native dry soil samples mediated H-2 oxidation, but rates increased 950-fold following wetting. Oxygenic and anoxygenic phototrophs were also detected in the community but at lower abundances. Hydration significantly stimulated rates of photosynthetic carbon fixation and, to a lesser extent, dark carbon assimilation. Hydrogenase genes were also widespread in samples from three other climatically distinct deserts, the Namib, Gobi, and Mojave, and atmospheric H-2 oxidation was also greatly stimulated by hydration at these sites. Together, these findings highlight that H-2 is an important, hitherto-overlooked energy source supporting bacterial communities in desert soils. Contrary to our previous hypotheses, however, H-2 oxidation occurs simultaneously rather than alternately with photosynthesis in such ecosystems and may even be mediated by some photoautotrophs. IMPORTANCE Desert ecosystems, spanning a third of the earth's surface, harbor remarkably diverse microbial life despite having a low potential for photosynthesis. In this work, we reveal that atmospheric hydrogen serves as a major previously overlooked energy source for a large proportion of desert bacteria. We show that both chemoheterotrophic and photoautotrophic bacteria have the potential to oxidize hydrogen across deserts sampled across four continents. Whereas hydrogen oxidation was slow in native dry deserts, it increased by three orders of magnitude together with photosynthesis following hydration. This study revealed that continual harvesting of atmospheric energy sources may be a major way that desert communities adapt to long periods of water and energy deprivation, with significant ecological and biogeochemical ramifications.
英文关键词	carbon fixation desert hydrogen hydrogenase primary production trace gas
类型	Article
语种	英语
开放获取类型	gold, Green Published
收录类别	SCI-E
WOS记录号	WOS:000630974900016
WOS关键词	HIGH-AFFINITY ; MICROBIAL COMMUNITIES ; PRECIPITATION PULSES ; DRY SOIL ; ENERGY ; H-2 ; DROUGHT ; WATER ; MICROORGANISMS ; ACIDOBACTERIA
WOS类目	Microbiology
WOS研究方向	Microbiology
来源机构	University of Arizona
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/349078
作者单位	[Jordaan, Karen; Lappan, Rachael; Aitkenhead, Ian J.; Bay, Sean K.; Chiri, Eleonora; Chown, Steven L.; Greening, Chris] Monash Univ, Sch Biol Sci, Clayton, Vic, Australia; [Jordaan, Karen; Cowan, Don A.] Univ Pretoria, Ctr Microbial Ecol & Genom, Dept Biochem Genet & Microbiol, Pretoria, South Africa; [Lappan, Rachael; Bay, Sean K.; Chiri, Eleonora; Greening, Chris] Monash Univ, Biomed Discovery Inst, Dept Microbiol, Clayton, Vic, Australia; [Dong, Xiyang] Sun Yat Sen Univ, Sch Marine Sci, Zhuhai, Peoples R China; [Wieler, Nimrod] Geol Survey Israel, Jerusalem, Israel; [Meredith, Laura K.] Univ Arizona, Sch Nat Resources & Environm, Tucson, AZ USA; [Jordaan, Karen] Pontificia Univ Catolica Chile, Dept Genet Mol & Microbiol, Fac Ciencias Biol, Santiago, Chile
推荐引用方式 GB/T 7714	Jordaan, Karen,Lappan, Rachael,Dong, Xiyang,et al. Hydrogen-Oxidizing Bacteria Are Abundant in Desert Soils and Strongly Stimulated by Hydration[J]. University of Arizona,2020,5(6).
APA	Jordaan, Karen.,Lappan, Rachael.,Dong, Xiyang.,Aitkenhead, Ian J..,Bay, Sean K..,...&Greening, Chris.(2020).Hydrogen-Oxidizing Bacteria Are Abundant in Desert Soils and Strongly Stimulated by Hydration.MSYSTEMS,5(6).
MLA	Jordaan, Karen,et al."Hydrogen-Oxidizing Bacteria Are Abundant in Desert Soils and Strongly Stimulated by Hydration".MSYSTEMS 5.6(2020).