Authors: Asumi Nakamura Cho Cho Tun Susumu Asakawa Makoto Kimura
Publish Date: 2003/07/24
Volume: 38, Issue: 5, Pages: 288-295
Abstract
To estimate the microbial communities responsible for rice straw decomposition in paddy field phospholipid fatty acid PLFA composition of leaf sheaths and blades was analyzed during the decomposition of both residues under upland conditions after harvest and under flooded conditions at the time of transplanting of rice plants In addition rice straw that had been placed in the field under upland conditions November to April was taken out in spring and placed again in the same field under flooded conditions at the time of transplanting High proportions of the branchedchain PLFAs were observed under flooded conditions June to September the proportions of straight monounsaturated and straight polyunsaturated PLFAs were high under upland conditions in the winter season for 4 months The dominant PLFAs in straight monounsaturated straight polyunsaturated and branchedchain PLFA groups were 181ω9 181ω7 and 161ω7c 182ω6c and i150 i170 and ai150 respectively under both upland and flooded conditions These findings indicated the important roles of Gramnegative bacteria and fungi under upland conditions and of Grampositive bacteria and anaerobic Gramnegative bacteria under flooded conditions Cluster analysis of PLFA composition showed the difference of community structure of microbiota in rice straw between upland and flooded conditions In addition principal component analysis revealed the difference between leaf sheaths and blades under upland conditions and indicated that the content of straight unsaturated PLFAs sheaths blades characterized their community structures
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