title: [Diversity of fe-hydrogenase microbe in Guizhou red paddy soil during flooding incubation].
abstract: OBJECTIVE
  The diversity of Fe-hydrogenase based on Fe-hydrogenase gene of Clostridium was studied for exploring the biochemical mechanism of soil microbial hydrogen production and revealing the Fe-hydrogenase microbial community structure changes during the paddy soil flooding incubation.
  
  
  METHODS
  We used denatured gradient gel electrophoresis and real-time quantitative PCR to achieve the goal.
  
  
  RESULTS
  The band number of Fe-hydrogenase denatured gradient gel electrophoresis fingerprints indicated Fe-hydrogenase microbes structure varied significantly during the completely flooding incubation. The Principal Component Analysis (PCA) showed the highly similar communities of Fe-hydrogenase microbial was divided into three groups: 1 d and 20 d, the 5 d, 30 d and 40 d. With the growth of the flooding incubation time Fe-hydrogenase microbial community structure became relatively stable and convergence. Alpha diversity index analysis found that the richness index (R), Shannon-Weaver index (H'), Simpson index (D(S)) numerical values of 1 d and 10 d were lower compared with other points, indicated the two time points of low Fe-hydrogenase diversity, simple Fe-hydrogenase microbial community structure and successive variation of community structure during the whole flooding incubation. After sequencing 15 Fe-hydrogenase preponderant bands ( labeled by G1 - G15), the phylogenetic tree of Fe-hydrogenase showed that the preponderant bands all had high similarity with the Clostridium Fe-hydrogenase in earlier flooding incubation stage and non-Clostridium Fe-hydrogenase in the later stage. Real-time quantitative PCR results demonstrated that the Fe-hydrogenase gene copy number was 10(6) level.
  
  
  CONCLUSIONS
  In the research we found 4 kinds of Clostridium Fe-hydrogenases and three kinds of non-Clostridium Fe-hydrogenases, the corresponding Fe-hydrogenase microbial community structure had successively significant variation in the early incubation stage and tend to be relatively stable and convergence in the late stage.
authors.affiliation: College of Life Sciences, Northwest A&F University, Yangling 712100, China. ymzh20052006@126.com
authors.forename: Miaozhang
authors.initials: M
authors.lastname: Yan
authors.forename: Lina
authors.initials: L
authors.lastname: Li
authors.forename: Baoli
authors.initials: B
authors.lastname: Wang
authors.forename: Dong
authors.initials: D
authors.lastname: Qu
mesh_terms: D001419:Bacteria / Q000145:classification / Q000201:enzymology* / Q000235:genetics; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D044822:Biodiversity; D002681:China; D055868:Floods; D006864:Hydrogenase / Q000235:genetics / Q000378:metabolism*; D007506:Iron-Sulfur Proteins / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D010802:Phylogeny; D012988:Soil Microbiology
chemical_list: D001426:Bacterial Proteins; D007506:Iron-Sulfur Proteins; C118830:iron hydrogenase; D006864:Hydrogenase