Molecular characterization of diazotrophic and denitrifying bacteria associated with mangrove roots.

ABSTRACT: An analysis of the molecular diversity of N(2) fixers and denitrifiers associated with mangrove roots was performed using terminal restriction length polymorphism (T-RFLP) of nifH (N(2) fixation) and nirS and nirK (denitrification), and the compositions and structures of these communities among three sites were compared. The number of operational taxonomic units (OTU) for nifH was higher than that for nirK or nirS at all three sites. Site 3, which had the highest organic matter and sand content in the rhizosphere sediment, as well as the lowest pore water oxygen concentration, had the highest nifH diversity. Principal component analysis of biogeochemical parameters identified soil texture, organic matter content, pore water oxygen concentration, and salinity as the main variables that diff

SUBMITTER: Flores-Mireles AL 

PROVIDER: S-EPMC2168205 | biostudies-literature | 2007 Nov

REPOSITORIES: biostudies-literature