Chemotactic Response to Amino Acids of Fluorescent Pseudomonads Isolated from Spinach Roots Grown in Soils with Different Salinity Levels

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概要

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• Chemotaetie response to amino acids of fluorescent pseudomonads isolated from spinach roots grown in a low-salinity soil (LR-group) and its corresponding high-salinity soil (HR-group) was investigated. Furthermore, the amount and composition of amino acids in the root exudate under low- and high-salinity conditions were investigated. All the isolates examined showed a ehemotaetie response exclusively to the amino acid fraction, while most of them did not respond to the sugar and the organic acid fractions. Based on these results, the chemotaetie response to 20 amino acids of randomly selected 48 isolates, of which 12 isolates each belongs to the LR- and HR-groups of both Pseudomonas putida and P. fluorescens, was investigated. The results showed that the spectrum of cherootaxis to 20 amino acids of the H-group of each species was markedly different from that of the corresponding L-group. Also, the amino acid composition of the root exudate in the high-salinity culture solution significantly differed from that in the low-salinity culture solution. The total amount of amino acids from the high-salinity solution was 2.83 μmol g^1 fresh roots, which was as small as 42% of that from the low-salinity culture solution. These results indicated that high salinity of soil may exert an effect on root colonization by fluorescent pseudomonads not only directly through the effect in the bacterial ehemotaxis but also indirectly through the modification of the root exudation of amino acids qualitatively and quantitatively.

• 社団法人日本土壌肥料学会の論文

著者

• Sakai Masao

  Laboratory Of Soil Microbiology Department Of Plant Resources Faculty Of Agriculture Kyushu Universi

• Sakai M

  Kyushu Univ. Fukuoka Jpn

• Sakai M

  Laboratory Of Soil Microbiology Department Of Plant Resources Faculty Of Agriculture Kyushu Universi

• Matsuguchi T

  Laboratory Of Soil Microbiology And Biochemistry Department Of Agricultural Chemistry Faculty Of Agr

• Matsuguchi Tatsuhiko

  Laboratory of Soil Microbiology and Biochemistry, Department of Agricultural Chemistry, Faculty of A

• Futamata Hiroyuki

  Laboratory of Soil Microbiology and Biochemistry, Department of Agricultural Chemistry, Faculty of A

• Ozawa Hidenori

  Laboratory of Soil Microbiology and Biochemistry, Department of Agricultural Chemistry, Faculty of A

• Sueguchi Tadayoshi

  Laboratory of Soil Microbiology and Biochemistry, Department of Agricultural Chemistry, Faculty of A

• Sakai M

  Laboratory Of Soil Microbiology Division Of Soil Science And Plant Production Department Of Plant Re

• Sasaki M

  Laboratory Of Soil Microbiology And Biochemistry Department Of Agricultural Chemistry Faculty Of Agr

• Urashima Yasufumi

  Laboratory of Soil Microbiology and Biochemistry, Department of Agricultural Chemistry, Faculty of A

• Sakai Masao

  Laboratory Of Soil Microbiology And Biochemistry Department Of Agricultural Chemistry Faculty Of Agr

• Futamata Hiroyuki

  Department Of Ecological Engineering Toyohashi University Of Technology:(present Office)department O

• Futamata Hiroyuki

  Laboratory Of Soil Microbiology And Biochemistry Department Of Agricultural Chemistry Faculty Of Agr

• Urashima Yasufumi

  Department Of Upland Farming National Agricultural Research Center For Tohoku Region

• Urashima Yasufumi

  Laboratory Of Soil Microbiology And Biochemistry Department Of Agricultural Chemistry Faculty Of Agr

• Urashima Yasufumi

  National Agricultural Research Center For Tohoku Region

• Ozawa Hidenori

  Laboratory Of Soil Microbiology And Biochemistry Department Of Agricultural Chemistry Faculty Of Agr

• Ozawa Hidenori

  Leaf Tobacco Research Laboratory Japan Tobacco Inc.

• Futamata H

  Department Of Ecological Engineering Toyohashi University Of Technology

• Sueguchi Tadayoshi

  Laboratory Of Soil Microbiology And Biochemistry Department Of Agricultural Chemistry Faculty Of Agr

• Matsuguchi Tatsuhiko

  Laboratory Of Soil Macrobiology And Biochemistry Department Of Agricultural Chemistry Faculty Of Agr

• Urashima Yasufumi

  National Agricultural Research Center For Tohoku Region:(present Office)national Agricultural Resear

• Sakai Masao

  Laboratory Of Soil Macrobiology And Biochemistry Department Of Agricultural Chemistry Faculty Of Agr

• Sasaki Masao

  Laboratory of Soil Microbiology and Biochemistry, Department of Agricultural Chemistry, Faculty of Agriculture, Kyusyu University

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