title: Diversity of Actinobacterial community in saline sediments from Yunnan and Xinjiang, China.
abstract: The diversity and community structures of actinobacteria in saline sediments collected from Yunnan and Xinjiang Provinces, China, were investigated with cultivation and 16S rRNA gene analysis. A total of 163 actinobacterial isolates were obtained, and they were affiliated with the order Actinomycetales (distributed into five suborders: Streptosporangineae, Micrococcineae, Streptomycineae, Pseudonocardineae, and Glycomycineae). A total of 748 actinobacterial 16S rRNA gene clones were examined, and they could be classified into Actinomycetales, Acidimicrobiales, and unclassified actinobacteria. The Actinomycetales sequences were distributed into nine suborders: Streptosporangineae, Glycomycineae, Micromonosporineae, Pseudonocardineae, Corynebacterineae, Frankineae, Propionibacterineae, Streptomycineae, and Micrococcineae. The unclassified actinobacteria contained three new clusters at the level of subclass or order. Our 16S rRNA gene phylogenetic data indicated that actinobacterial communities were very diverse in the investigated saline sediments (salinity 0.4-11.6%) and some actinobacterial members may be halotolerant or halophilic. The actinobacterial community structures in the saline sediments were different from those in marine and freshwater environments. Our data have implications for a better understanding of the distribution of Actinobacteria in saline environments.
authors.affiliation: Yunnan Institute of Microbiology, Yunnan University, Kunming, China. ufogio@hotmail.com
authors.forename: Jinyuan
authors.initials: J
authors.lastname: Wu
authors.forename: Tongwei
authors.initials: T
authors.lastname: Guan
authors.forename: Hongchen
authors.initials: H
authors.lastname: Jiang
authors.forename: Xiaoyang
authors.initials: X
authors.lastname: Zhi
authors.forename: Shukun
authors.initials: S
authors.lastname: Tang
authors.forename: Hailiang
authors.initials: H
authors.lastname: Dong
authors.forename: Lili
authors.initials: L
authors.lastname: Zhang
authors.forename: Wenjun
authors.initials: W
authors.lastname: Li
mesh_terms: D039903:Actinobacteria / Q000145:classification / Q000235:genetics*; D044822:Biodiversity; D002681:China; D017753:Ecosystem; D015723:Gene Library; D014644:Genetic Variation; D019015:Geologic Sediments / Q000382:microbiology*; D006863:Hydrogen-Ion Concentration; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000378:metabolism; D012492:Salts / Q000737:chemistry; D013045:Species Specificity; D014871:Water Microbiology
chemical_list: D012336:RNA, Ribosomal, 16S; D012492:Salts