干旱区生态环境知识资源中心(Arid): Lithic cyanobacterial communities in the polyextreme Sahara Desert: implications for the search for the limits of life

Arid

DOI	10.1111/1462-2920.15850
	Lithic cyanobacterial communities in the polyextreme Sahara Desert: implications for the search for the limits of life
	Mehda, Smail; Munoz-Martin, M. Angeles; Oustani, Mabrouka; Hamdi-Aissa, Baelhadj; Perona, Elvira; Mateo, Pilar
通讯作者	Mateo, P (corresponding author), Univ Autonoma Madrid, Fac Ciencias, Dept Biol, Madrid 28049, Spain.
来源期刊	ENVIRONMENTAL MICROBIOLOGY
ISSN	1462-2912
EISSN	1462-2920
出版年	2022
英文摘要	The hyperarid Sahara Desert presents extreme and persistent dry conditions with a limited number of hours during which the moisture availability, temperature and light allow phototrophic growth. Some cyanobacteria can live in these hostile conditions by seeking refuge under (hypolithic) or inside (endolithic) rocks, by colonizing porous spaces (cryptoendoliths) or fissures in stones (chasmoendoliths). Chroococcidiopsis spp. have been reported as the dominant or even the only phototrophs in these hot desert lithic communities. However, the results of this study reveal the high diversity of and variability in cyanobacteria among the sampled habitats in the Sahara Desert. The chasmoendolithic samples presented high coccoid cyanobacteria abundances, although the dominant cyanobacteria were distinct among different locations. A high predominance of a newly described cyanobacterium, Pseudoacaryochloris sahariense, was found in hard, compact, and more opaque stones with cryptoendolithic colonization. On the other hand, the hypolithic samples were dominated by filamentous, non-heterocystous cyanobacteria. Thermophysiological bioassays confirmed desiccation and extreme temperature tolerance as drivers in the cyanobacterial community composition of these lithic niches. The results of the present study provide key factors for understanding life strategies under polyextreme environmental conditions. The isolated strains, especially the newly described cyanobacterium P. sahariense, might represent suitable microorganisms in astrobiology studies aimed at investigating the limits of life.
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000722930500001
WOS关键词	ENVIRONMENTAL GRADIENTS ; MICROBIAL COLONIZATION ; ENDOLITHIC COMMUNITIES ; HYPOLITHIC COMMUNITIES ; ATACAMA DESERT ; CHINA HOT ; DIVERSITY ; PHOTOSYNTHESIS ; MICROORGANISMS ; ECOLOGY
WOS类目	Microbiology
WOS研究方向	Microbiology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/374639
作者单位	[Mehda, Smail; Munoz-Martin, M. Angeles; Perona, Elvira; Mateo, Pilar] Univ Autonoma Madrid, Fac Ciencias, Dept Biol, Madrid 28049, Spain; [Mehda, Smail; Hamdi-Aissa, Baelhadj] Univ Ouargla, Lab Biogeochem Desert Areas, Ouargla 30000, Algeria; [Mehda, Smail] Univ El Oued, Dept Agron, Fac Life & Nat Sci, El Oued 39000, Algeria; [Oustani, Mabrouka] Univ Ouargla, Lab Saharan BioResources Preservat & Dev, Ouargla 30000, Algeria
推荐引用方式 GB/T 7714	Mehda, Smail,Munoz-Martin, M. Angeles,Oustani, Mabrouka,et al. Lithic cyanobacterial communities in the polyextreme Sahara Desert: implications for the search for the limits of life[J],2022.
APA	Mehda, Smail,Munoz-Martin, M. Angeles,Oustani, Mabrouka,Hamdi-Aissa, Baelhadj,Perona, Elvira,&Mateo, Pilar.(2022).Lithic cyanobacterial communities in the polyextreme Sahara Desert: implications for the search for the limits of life.ENVIRONMENTAL MICROBIOLOGY.
MLA	Mehda, Smail,et al."Lithic cyanobacterial communities in the polyextreme Sahara Desert: implications for the search for the limits of life".ENVIRONMENTAL MICROBIOLOGY (2022).