干旱区生态环境知识资源中心(Arid): Differences in the Cyanobacterial Community Composition of Biocrusts From the Drylands of Central Mexico. Are There Endemic Species?

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DOI	10.3389/fmicb.2019.00937
	Differences in the Cyanobacterial Community Composition of Biocrusts From the Drylands of Central Mexico. Are There Endemic Species?
	Becerra-Absalon, Itzel 1,2; Angeles Munoz-Martini, M.1; Montejano, Gustavo 2; Mateo, Pilar 1
通讯作者	Mateo, Pilar
来源期刊	FRONTIERS IN MICROBIOLOGY
ISSN	1664-302X
出版年	2019
卷号	10
英文摘要	In drylands worldwide, biocrusts, topsoil microbial communities, are prevalent, contributing to the biostabilization of soils and allowing the subsequent establishment and growth of vascular plants. In early successional biocrusts, cyanobacteria are the first dominant colonizers of bare ground, largely determining their functioning. However, there are large gaps in our knowledge of the cyanobacterial diversity in biocrusts, particularly in understudied geographic regions, such as the tropical latitudes. We analyzed the diversity of the cyanobacteria inhabiting the biocrusts of semideserts from Central Mexico in two localities belonging to the same desert system (Chihuahuan Desert) that are separated by a cordillera that crosses the center of Mexico. Morphological identification of the cyanobacteria was carried out after cultivation in parallel with the direct observation of the environmental samples and was supported by genetic characterization through analysis of the 16S rRNA gene of the isolated strains and by next-generation sequencing of the soil samples. Taxonomic assignment revealed a clear dominance of heterocystous cyanobacteria at one of the studied locations (Actopan, Hidalgo state). Although heterocystous forms were abundant at the other location (Atexcac, Puebla state), almost a third of the cyanobacterial phylotypes were represented by unicellular/colonial cyanobacteria, mostly Chroococcidiopsis spp. Only 28.4% of the phylotypes were found to be common to both soils. Most of the other taxa, however, were biocrust-type specific, and approximately 35% of the phylotypes were found to be unique to the soil they were collected in. In addition, differences in the abundances of the shared cyanobacteria between the locations were also found. These differences in the cyanobacterial distribution were supported by the distinct responses of the isolated strains representative of the sites to extreme heat and desiccation in bioassays. Some cyanobacteria with high abundance or only present at the hottest Actopan site, such as Scytonema hyalinum, Scytonema crispum, Nostoc commune, Nostoc sp., and Calothn'x parietina, survived extreme heat and desiccation. However, Tolypothrix distorta and Chroococcidiopsis spp. were clearly sensitive to these extreme conditions in relation to their lower abundances at Actopan as opposed to Atexcac. Since novel biocrust-associated phylotypes were also found, the emergence of endemic cyanobacterial taxa is discussed.
英文关键词	biological soil crusts cyanobacteria Illumina sequencing drylands endemic species
类型	Article
语种	英语
国家	Spain ; Mexico
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000467023700001
WOS关键词	BIOLOGICAL SOIL CRUSTS ; RIBOSOMAL-RNA ; MOJAVE DESERT ; GREEN-ALGAE ; DIVERSITY ; SCYTONEMIN ; SEQUENCES ; PATTERNS ; BIOFILMS ; PIGMENT
WOS类目	Microbiology
WOS研究方向	Microbiology
来源机构	Universidad Nacional Autónoma de México
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215791
作者单位	1.Univ Autonoma Madrid, Dept Biol, Fac Ciencias, Madrid, Spain; 2.Univ Nacl Autonoma Mexico, Fac Ciencias, Dept Biol Comparada, Mexico City, DF, Mexico
推荐引用方式 GB/T 7714	Becerra-Absalon, Itzel,Angeles Munoz-Martini, M.,Montejano, Gustavo,et al. Differences in the Cyanobacterial Community Composition of Biocrusts From the Drylands of Central Mexico. Are There Endemic Species?[J]. Universidad Nacional Autónoma de México,2019,10.
APA	Becerra-Absalon, Itzel,Angeles Munoz-Martini, M.,Montejano, Gustavo,&Mateo, Pilar.(2019).Differences in the Cyanobacterial Community Composition of Biocrusts From the Drylands of Central Mexico. Are There Endemic Species?.FRONTIERS IN MICROBIOLOGY,10.
MLA	Becerra-Absalon, Itzel,et al."Differences in the Cyanobacterial Community Composition of Biocrusts From the Drylands of Central Mexico. Are There Endemic Species?".FRONTIERS IN MICROBIOLOGY 10(2019).