title: Changes in the bacterial populations of the highly alkaline saline soil of the former lake Texcoco (Mexico) following flooding.
abstract: Flooding an extreme alkaline-saline soil decreased alkalinity and salinity, which will change the bacterial populations. Bacterial 16S rDNA libraries were generated of three soils with different electrolytic conductivity (EC), i.e. soil with EC 1.7 dS m(-1) and pH 7.80 (LOW soil), with EC 56 dS m(-1) and pH 10.11 (MEDIUM soil) and with EC 159 dS m(-1) and pH 10.02 (HIGH soil), using universal bacterial oligonucleotide primers, and 463 clone 16S rDNA sequences were analyzed phylogenetically. Library proportions and clone identification of the phyla Proteobacteria, Actinobacteria, Acidobacteria, Cyanobacteria, Bacteroidetes, Firmicutes and Cloroflexi showed that the bacterial communities were different. Species and genera of the Rhizobiales, Rhodobacterales and Xanthomonadales orders of the alpha- and gamma-subdivision of Proteobacteria were found at the three sites. Species and genera of the Rhodospirillales, Sphingobacteriales, Clostridiales, Oscillatoriales and Caldilineales were found only in the HIGH soil, Sphingomonadales, Burkholderiales and Pseudomonadales in the MEDIUM soil, Myxococcales in the LOW soil, and Actinomycetales in the MEDIUM and LOW soils. It was found that the largest diversity at the order and species level was found in the MEDIUM soil as bacteria of both the HIGH and LOW soils were found in it.
authors.affiliation: Departamento de Biotecnología y Bioingeniería, Cinvestav, Mexico, DF, México.
authors.forename: César
authors.initials: C
authors.lastname: Valenzuela-Encinas
authors.forename: Isabel
authors.initials: I
authors.lastname: Neria-González
authors.forename: Rocio J
authors.initials: RJ
authors.lastname: Alcántara-Hernández
authors.forename: Isabel
authors.initials: I
authors.lastname: Estrada-Alvarado
authors.forename: Francisco Javier
authors.initials: FJ
authors.lastname: Zavala-Díaz de la Serna
authors.forename: Luc
authors.initials: L
authors.lastname: Dendooven
authors.forename: Rodolfo
authors.initials: R
authors.lastname: Marsch
mesh_terms: D000538:Aluminum Silicates; D001419:Bacteria / Q000235:genetics; D000077215:Clay; D004553:Electric Conductivity; D055868:Floods; D005798:Genes, Bacterial; D006863:Hydrogen-Ion Concentration; D008800:Mexico; D010802:Phylogeny; D020560:Proteobacteria / Q000378:metabolism; D012336:RNA, Ribosomal, 16S / Q000737:chemistry; D012492:Salts / Q000737:chemistry; D017422:Sequence Analysis, DNA; D012987:Soil; D012988:Soil Microbiology; D014867:Water / Q000378:metabolism
chemical_list: D000538:Aluminum Silicates; D012336:RNA, Ribosomal, 16S; D012492:Salts; D012987:Soil; D014867:Water; D000077215:Clay