title: Characterization of amplified polymerase chain reaction glnB and nifH gene fragments of nitrogen-fixing Burkholderia species.
abstract: OBJECTIVE
  To clone and sequence polymerase chain reaction (PCR)-amplified glnB and nifH genes of the nitrogen-fixing bacteria Burkholderia brasilensis strain M130, B. tropicalis strain PPe8 and B. kururiensis strain KP23.
  
  
  RESULTS
  The glnB and nifH gene fragments were amplified by PCR using universal degenerated primers. A very high percentage of similarity for the nifH (100%) and glnB (96%) genes was observed between strains M130 and KP23. A similarity of 100% for the nifH gene was also observed between strains M130 and PPe8. However, the identity for the glnB gene was 98% and the similarity 88%. The phylogenetic tree of the nifH gene showed a very high degree of similarity to the 16S rDNA gene.
  
  
  CONCLUSIONS
  The nitrogen-fixing bacteria of the Burkholderia genus formed a cluster separated from the other species of the genus mainly when the nifH rather than the glnB gene was used to construct the phylogenetic tree.
  
  
  CONCLUSIONS
  Knowledge of the nifH and glnB gene sequences of B. brasilensis, B. tropicalis and B. kururiensis will support new studies on the diversity of these diazotrophs in natural environments.
authors.affiliation: Embrapa Agrobiologia, Laboratorio de Genética e Bioquímica, Seropédica, Rio de Janeiro State, Brazil.
authors.forename: V A
authors.initials: VA
authors.lastname: Marin
authors.forename: K R S
authors.initials: KR
authors.lastname: Teixeira
authors.forename: J I
authors.initials: JI
authors.lastname: Baldani
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics*; D001483:Base Sequence; D019117:Burkholderia / Q000145:classification* / Q000235:genetics; D009586:Nitrogen Fixation / Q000235:genetics*; D010088:Oxidoreductases / Q000235:genetics*; D051922:PII Nitrogen Regulatory Proteins; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length; D012336:RNA, Ribosomal, 16S; D016415:Sequence Alignment
chemical_list: D001426:Bacterial Proteins; D051922:PII Nitrogen Regulatory Proteins; D012336:RNA, Ribosomal, 16S; C404143:PIID regulatory protein, Bacteria; D010088:Oxidoreductases; C029130:nitrogenase reductase