气候变化领域集成服务门户(CCPortal): An ecophysiological explanation for manganese enrichment in rock varnish

CCPortal

DOI	10.1073/pnas.2025188118
	An ecophysiological explanation for manganese enrichment in rock varnish
	Lingappa U.F.; Yeager C.M.; Sharma A.; Lanza N.L.; Morales D.P.; Xie G.; Atencio A.D.; Chadwick G.L.; Monteverde D.R.; Magyar J.S.; Webb S.M.; Valentine J.S.; Hoffman B.M.; Fischer W.W.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:25
英文摘要	Desert varnish is a dark rock coating that forms in arid environments worldwide. It is highly and selectively enriched in manganese, the mechanism for which has been a long-standing geological mystery. We collected varnish samples from diverse sites across the western United States, examined them in petrographic thin section using microscale chemical imaging techniques, and investigated the associated microbial communities using 16S amplicon and shotgun metagenomic DNA sequencing. Our analyses described a material governed by sunlight, water, and manganese redox cycling that hosts an unusually aerobic microbial ecosystem characterized by a remarkable abundance of photosynthetic Cyanobacteria in the genus Chroococcidiopsis as the major autotrophic constituent. We then showed that diverse Cyanobacteria, including the relevant Chroococcidiopsis taxon, accumulate extraordinary amounts of intracellular manganese—over two orders of magnitude higher manganese content than other cells. The speciation of this manganese determined by advanced paramagnetic resonance techniques suggested that the Cyanobacteria use it as a catalytic antioxidant—a valuable adaptation for coping with the substantial oxidative stress present in this environment. Taken together, these results indicated that the manganese enrichment in varnish is related to its specific uptake and use by likely founding members of varnish microbial communities. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Rock varnish \| desert varnish \| Cyanobacteria \| manganese \| oxidative stress
语种	英语
scopus关键词	manganese; water; Article; Chroococcidiopsis; controlled study; cyanobacterium; DNA sequencing; ecophysiology; electron spin resonance; metagenomics; microbial community; nonhuman; oxidative stress; rock; sunlight; varnish
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238706
作者单位	Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, United States; Los Alamos National Laboratory, Los Alamos, NM 87545, United States; Department of Chemistry, Northwestern University, Evanston, IL 60208, United States; Stanford Synchrotron Radiation Lightsource, Stanford University, Menlo Park, CA 94025, United States; Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, United States
推荐引用方式 GB/T 7714	Lingappa U.F.,Yeager C.M.,Sharma A.,et al. An ecophysiological explanation for manganese enrichment in rock varnish[J],2021,118(25).
APA	Lingappa U.F..,Yeager C.M..,Sharma A..,Lanza N.L..,Morales D.P..,...&Fischer W.W..(2021).An ecophysiological explanation for manganese enrichment in rock varnish.Proceedings of the National Academy of Sciences of the United States of America,118(25).
MLA	Lingappa U.F.,et al."An ecophysiological explanation for manganese enrichment in rock varnish".Proceedings of the National Academy of Sciences of the United States of America 118.25(2021).