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FEMS Microbiol Ecol ; 52(1): 71-8, 2005 Mar 01.
Article in English | MEDLINE | ID: mdl-16329894

ABSTRACT

Pseudomonas putida strain A313, a deleterious rhizosphere bacterium, reduced pea nitrogen content when inoculated alone or in combination with Rhizobium leguminosarum bv. viceae on plants in the presence of soil under greenhouse conditions. When plants were grown gnotobiotically in liquid media, mixed inocula of A313 and rhizobia gave a higher proportion of small evenly distributed nodules when compared with a single rhizobial inoculation. In addition, the rhizobial root establishment was reduced by A313 irrespective of inoculum density, indicating that A313 has the capacity to interact with the early rhizobial infection process. When pea seedlings were simultaneously inoculated with A313 and rhizobia, A313 colonised the root hairs to the same extent as the rhizobia, according to analysis by immunofluorescence microscopy. This suggests that the root hair colonisation trait of P. putida interferes with the onset of the symbiotic process.


Subject(s)
Pisum sativum/microbiology , Plant Roots/microbiology , Pseudomonas putida/physiology , Rhizobium leguminosarum/physiology , Symbiosis , Analysis of Variance , Microscopy, Fluorescence , Nitrogen/metabolism , Pisum sativum/metabolism , Pseudomonas putida/pathogenicity
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