干旱区生态环境知识资源中心(Arid): Natural Extracellular Electron Transfer Between Semiconducting Minerals and Electroactive Bacterial Communities Occurred on the Rock Varnish

Arid

DOI	10.3389/fmicb.2019.00293
	Natural Extracellular Electron Transfer Between Semiconducting Minerals and Electroactive Bacterial Communities Occurred on the Rock Varnish
	Ren, Guiping 1; Yan, Yingchun 2; Nie, Yong 2; Lu, Anhuai 1; Wu, Xiaolei 2; Li, Yan1 ; Wang, Changqiu 1; Ding, Hongrui 1
通讯作者	Lu, Anhuai ; Ding, Hongrui
来源期刊	FRONTIERS IN MICROBIOLOGY
ISSN	1664-302X
出版年	2019
卷号	10
英文摘要	Rock varnish is a thin coating enriched with manganese (Mn) and iron (Fe) oxides. The mineral composition and formation of rock varnish elicit considerable attention from geologists and microbiologists. However, limited research has been devoted to the semiconducting properties of these Fe/Mn oxides in varnish and relatively little attention is paid to the mineral-microbe interaction under sunlight. In this study, the mineral composition and the bacterial communities on varnish from the Gobi Desert in Xinjiang, China were analyzed. Results of principal components analysis and t-test indicated that more electroactive genera such as Acinetobacter, Staphylococcus, Dietzia, and Pseudomonas gathered on varnish bacterial communities than on substrate rock and surrounding soils. We then explored the culture of varnish, substrate and soil samples in media and the extracellular electron transfer (EET) between bacterial communities and mineral electrodes under light/dark conditions for the first time. Orthogonal electrochemical experiments demonstrated that the most remarkable photocurrent density of 6.1 +/- 0.4 mu A/cm(2) was observed between varnish electrode and varnish microflora. Finally, based on Raman and 16S rRNA gene-sequencing results, coculture system of birnessite and Pseudomonas (the major Mn oxide and a common electroactive bacterium in varnish) was established to study underlying mechanism. A steadily growing photocurrent (205 mu A at 100 h) under light was observed with a stable birnessite after 110 h. However, only 47 KA was generated in the dark control and birnessite was reduced to Mn2+ in 13 h, suggesting that birnessite helped deliver electrons instead of serving as an electron acceptor under light. Our study demonstrated that electroactive bacterial communities were positively correlated with Fe/Mn semiconducting minerals in varnish, and diversified EET process occurred on varnish under sunlight. Overall, these phenomena may influence bacterial-community structure in natural environments over time.
英文关键词	bacterial communities semiconducting minerals varnish extracellular electron transfer light
类型	Article
语种	英语
国家	Peoples R China
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000460262100001
WOS关键词	DESERT VARNISH ; NEGEV DESERT ; RUBROBACTER-RADIOTOLERANS ; WHIPPLE MOUNTAINS ; MANGANESE-OXIDE ; IRON ; MICROORGANISMS ; ELECTRICITY ; REDUCTION ; ORIGIN
WOS类目	Microbiology
WOS研究方向	Microbiology
来源机构	北京大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215783
作者单位	1.Peking Univ, Beijing Key Lab Mineral Environm Funct, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, Beijing, Peoples R China; 2.Peking Univ, Coll Engn, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Ren, Guiping,Yan, Yingchun,Nie, Yong,et al. Natural Extracellular Electron Transfer Between Semiconducting Minerals and Electroactive Bacterial Communities Occurred on the Rock Varnish[J]. 北京大学,2019,10.
APA	Ren, Guiping.,Yan, Yingchun.,Nie, Yong.,Lu, Anhuai.,Wu, Xiaolei.,...&Ding, Hongrui.(2019).Natural Extracellular Electron Transfer Between Semiconducting Minerals and Electroactive Bacterial Communities Occurred on the Rock Varnish.FRONTIERS IN MICROBIOLOGY,10.
MLA	Ren, Guiping,et al."Natural Extracellular Electron Transfer Between Semiconducting Minerals and Electroactive Bacterial Communities Occurred on the Rock Varnish".FRONTIERS IN MICROBIOLOGY 10(2019).