title: Seasonal transition of active bacterial and archaeal communities in relation to water management in paddy soils.
abstract: Paddy soils have an environment in which waterlogging and drainage occur during the rice growing season. Fingerprinting analysis based on soil RNA indicated that active microbial populations changed in response to water management conditions, although the fundamental microbial community was stable as assessed by DNA-based fingerprinting analysis. Comparative clone library analysis based on bacterial and archaeal 16S rRNAs (5,277 and 5,436 clones, respectively) revealed stable and variable members under waterlogged or drained conditions. Clones related to the class Deltaproteobacteria and phylum Euryarchaeota were most frequently obtained from the samples collected under both waterlogged and drained conditions. Clones related to syntrophic hydrogen-producing bacteria, hydrogenotrophic methanogenic archaea, rice cluster III, V, and IV, and uncultured crenarchaeotal group 1.2 appeared in greater proportion in the samples collected under waterlogged conditions than in those collected under drained conditions, while clones belonging to rice cluster VI related to ammonia-oxidizing archaea (AOA) appeared at higher frequency in the samples collected under drained conditions than in those collected under waterlogged conditions. These results suggested that hydrogenotrophic methanogenesis may become active under waterlogged conditions, whereas ammonia oxidation may progress by rice cluster VI becoming active under drained conditions in the paddy field.
authors.affiliation: Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo.
authors.forename: Hideomi
authors.initials: H
authors.lastname: Itoh
authors.forename: Satoshi
authors.initials: S
authors.lastname: Ishii
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Shiratori
authors.forename: Kenshiro
authors.initials: K
authors.lastname: Oshima
authors.forename: Shigeto
authors.initials: S
authors.lastname: Otsuka
authors.forename: Masahira
authors.initials: M
authors.lastname: Hattori
authors.forename: Keishi
authors.initials: K
authors.lastname: Senoo
mesh_terms: D000641:Ammonia / Q000378:metabolism; D001105:Archaea / Q000145:classification / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism; D001419:Bacteria / Q000145:classification / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism; D044822:Biodiversity; D008697:Methane / Q000378:metabolism; D008969:Molecular Sequence Data; D012275:Oryza / Q000254:growth & development / Q000382:microbiology; D010802:Phylogeny; D012621:Seasons; D012987:Soil / Q000737:chemistry; D012988:Soil Microbiology; D014867:Water / Q000032:analysis
chemical_list: D012987:Soil; D014867:Water; D000641:Ammonia; D008697:Methane