Abstract:
: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.
journal_name
Appl Environ Microbioljournal_title
Applied and environmental microbiologyauthors
Tunlid A,Hoitink HA,Low C,White DCdoi
10.1128/AEM.55.6.1368-1374.1989keywords:
subject
Has Abstractpub_date
1989-06-01 00:00:00pages
1368-74issue
6eissn
0099-2240issn
1098-5336journal_volume
55pub_type
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journal_title:Applied and environmental microbiology
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pub_type: 杂志文章
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pub_type: 杂志文章
doi:10.1128/AEM.56.4.1157-1159.1990
更新日期:1990-04-01 00:00:00
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doi:10.1128/AEM.40.5.855-861.1980
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更新日期:2006-01-01 00:00:00
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journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.61.8.3069-3075.1995
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pub_type: 杂志文章
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journal_title:Applied and environmental microbiology
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pub_type: 杂志文章
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更新日期:1991-09-01 00:00:00
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pub_type: 杂志文章
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更新日期:2012-08-01 00:00:00
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journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.72.5.3448-3457.2006
更新日期:2006-05-01 00:00:00
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journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.70.10.6347-6351.2004
更新日期:2004-10-01 00:00:00