Characterization of bacteria that suppress rhizoctonia damping-off in bark compost media by analysis of Fatty Acid biomarkers.


:Examination of cucumber roots (Cucumis sativus L.) grown in bark compost media and of the surrounding edaphic substrate showed profiles of polar lipid fatty acids commonly found in bacteria. The composition of fatty acids in these profiles differed significantly between roots grown in a medium naturally suppressive to Rhizoctonia damping-off and roots from a conducive medium. Cucumber roots from the suppressive medium had higher proportions of cis-vaccenic acid (18:1 omega 7c) and the iso-branched monoenoic fatty acid i17:1 omega 8 but lower proportions of several iso- and anteiso-branched fatty acids compared with roots from the conducive medium. The concentrations of the bacterial fatty acids were significantly lower in the surrounding media. However, the suppressive and conducive growth substrates had differences in the composition of the bacterial fatty acids similar to those found between the cucumber roots proper. These results suggest major differences in bacterial community composition between suppressive and conducive systems. Fatty acid analyses were also utilized to examine the effects on bacterial community composition of root colonization by Flavobacterium balustinum 299, a biocontrol agent. The concentration of the most prominent fatty acid in this bacterium, i17:1 omega 8, was increased on roots produced from inoculated seeds in a medium rendered suppressive by the treatment. This change was concomitant with a significant increase in the concentration of 18:1 omega 7c, not present in the lipids of the antagonist, indicating a shift in the microflora from a conducive to a suppressive bacterial community.


Appl Environ Microbiol


Tunlid A,Hoitink HA,Low C,White DC





Has Abstract


1989-06-01 00:00:00












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    journal_title:Applied and environmental microbiology

    pub_type: 杂志文章


    authors: Sciocco-Cap A,Parola AD,Goldberg AV,Ghiringhelli PD,Romanowski V

    更新日期:2001-08-01 00:00:00

  • Isolation of Azospirillum lipoferum 4T Tn5 Mutants Affected in Melanization and Laccase Activity.

    abstract::Azospirillum lipoferum 4T has original properties such as nonmotility, melanin synthesis, and laccase activity. Following random Tn5 mutagenesis in A. lipoferum 4T, we obtained 10 mutants which were affected in melanization and laccase activity. The class 1 mutants, with intermediate levels of laccase activity, showed...

    journal_title:Applied and environmental microbiology

    pub_type: 杂志文章


    authors: Faure D,Bouillant ML,Bally R

    更新日期:1994-09-01 00:00:00

  • Strain-specific genotyping of Bifidobacterium animalis subsp. lactis by using single-nucleotide polymorphisms, insertions, and deletions.

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    更新日期:2009-12-01 00:00:00

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    journal_title:Applied and environmental microbiology

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    authors: Höfle MG

    更新日期:1992-10-01 00:00:00

  • High-temperature enzymatic breakdown of cellulose.

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    journal_title:Applied and environmental microbiology

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    journal_title:Applied and environmental microbiology

    pub_type: 杂志文章



    更新日期:1992-02-01 00:00:00

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    authors: David KA,Apte SK,Banerji A,Thomas J

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    authors: Dikicioglu D,Pir P,Onsan ZI,Ulgen KO,Kirdar B,Oliver SG

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    authors: Germida JJ

    更新日期:1988-01-01 00:00:00

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    pub_type: 杂志文章


    authors: McDevitt J,Rudnick S,First M,Spengler J

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    journal_title:Applied and environmental microbiology

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    authors: Taguchi S,Odaka A,Watanabe Y,Momose H

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    pub_type: 杂志文章


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    authors: Yoshimasu MA,Zawistowski J

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  • Size-selective predation on groundwater bacteria by nanoflagellates in an organic-contaminated aquifer.

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    pub_type: 杂志文章


    authors: Jock S,Kim WS,Barny MA,Geider K

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