Comparison of Phospholipid Fatty Acid Composition in Floodwater and Plow Layer Soil during the Rice Cultivation Period in a Japanese Paddy Field
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概要
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The bacterial numbers and the composition of phospholipid fatty acids (PLFAs) in the floodwater and the plow layer soil in a Japanese paddy field were compared during the rice cultivation period. The numbers of total and culturable bacteria ranged from 8.41×10^5 to 1.72×10^6 cells mL^<-1> and 1.47×10^4 to 8.49×10^4 CFU mL^<-1> in the floodwater, and 1.49×10^9 to 4.31×10^9 cells g^<-1> and 1.26×10^7 to 3.89×10^7 CFU g^<-1> in the plow layer soil, respectively. There was no appreciable seasonal variation in the number of bacteria either in the floodwater or in the plow layer soil. The amount of PLFAs in the plow layer soil ranged from 25.8 to 55.5 μg g^<-1> soil. The amount of PLFAs in the plow layer soil tended to increase just after midseason drainage. Dominant PLFAs in the floodwater were 16:1ω7c, 16:0, and 18:1ω7, and those in the plow layer soil were 16:0, 16:1ω7c, 18:1ω7, 18:1ω9, i15:0, ai15:0, and 10Me17:0, respectively. The proportion of straight, mono-unsaturated PLFAs and branched PLFAs ranged from 33 to 48% and from 9 to 21% in the floodwater and from 28 to 33% and from 30 to 44% in the plow layer soil, respectively, suggesting the predominance of Gram-negative bacteria in the floodwater and Gram-positive bacteria in the plow layer soil. Principal component analysis of PLFA composition clearly revealed the difference in microbiota between the floodwater and plow layer soil. An indicator of the environmental stress imposed upon microbiota expressed by the trans vs. cis ratio of 16:1ω7 was consistently lower in the floodwater than in the plow layer soil.
- 社団法人日本土壌肥料学会の論文
著者
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KIMURA Makoto
Graduate School of Bioagricultural Sciences, Nagoya University
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TOYOTA KOKI
Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Tec
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Toyota K
Nagoya Univ. Nagoya Jpn
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Toyota K
Graduate School Ofbio-applications And Systems Engineering Tokyo University Of Agriculture And Techn
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Toyota Koki
Laboratory Of Soil Biology And Chemistry School Of Agricultural Sciences Nagoya University
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Toyota Koki
Graduate School Of Bioagricultural Sciences Nagoya University
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Okabe A
Graduate School Of Bioagricultural Sciences Nagoya University:(present Office)graduate School Of Bio
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Okabe Akiko
Graduate School Of Bioagricultural Sciences Nagoya University:(present Office)graduate School Of Bio
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Oike Hiroe
Graduate School of Bioagricultural Sciences, Nagoya University
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Oike Hiroe
Graduate School Of Bioagricultural Sciences Nagoya University
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Toyota Koki
Graduate School Of Bio-application And System Engineering Tokyo University Agriculture And Technolog
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Kimura Makoto
Graduate School Of Bioagricultural Sciences Nagoya University
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Kimura Makoto
Graduate School Of Agricultural Sciences Nagoya University
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