Abstract
Denitrification is one of the important nitrogen transformation processes in rice (Oryza sativa L.) paddy soil. We have performed both culture-dependent and -independent studies to investigate the key players in denitrification in rice paddy soil. Our previous works suggested the possibility that community composition of denitrifying populations is different among soils. To confirm this possibility, in the present study, denitrifying bacteria were isolated from rice paddy field soils (Kumamoto and Tokyo) in Japan by the functional single-cell isolation method, and examined for their taxonomic position. Combined with our previously isolated strains from Niigata paddy field soil, our results clearly indicated that the taxonomic composition of the denitrifying bacterial community is different at the genus level among three soils. A significant difference in mean potential denitrification activity of the isolates at the genus level was also found. Soil and/or other environmental factors could shape the community structure of denitrifiers in rice paddy soil.
Published Version
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