Journal Article

The plant nitrogen mobilization promoted by <i>Colletotrichum lindemuthianum</i> in <i>Phaseolus</i> leaves depends on fungus pathogenicity

Virginie Tavernier, Sandrine Cadiou, Karine Pageau, Richard Laugé, Michèle Reisdorf-Cren, Thierry Langin and Céline Masclaux-Daubresse

in Journal of Experimental Botany

Published on behalf of Society for Experimental Biology

Volume 58, issue 12, pages 3351-3360
Published in print September 2007 | ISSN: 0022-0957
Published online September 2007 | e-ISSN: 1460-2431 | DOI: http://dx.doi.org/10.1093/jxb/erm182
The plant nitrogen mobilization promoted by Colletotrichum lindemuthianum in Phaseolus leaves depends on fungus pathogenicity

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Nitrogen plays an essential role in the nutrient relationship between plants and pathogens. Some studies report that the nitrogen-mobilizing plant metabolism that occurs during abiotic and biotic stress could be a ‘slash-and-burn’ defence strategy. In order to study nitrogen recycling and mobilization in host plants during pathogen attack and invasion, the Colletotrichum lindemuthianum/Phaseolus vulgaris interaction was used as a model. C. lindemuthianum is a hemibiotroph that causes anthracnose disease on P. vulgaris. Non-pathogenic mutants and the pathogenic wild-type strain were used to compare their effects on plant metabolism. The deleterious effects of infection were monitored by measuring changes in chlorophyll, protein, and amino acid concentrations. It was shown that amino acid composition changed depending on the plant–fungus interaction and that glutamine accumulated mainly in the leaves infected by the pathogenic strain. Glutamine accumulation correlated with the accumulation of cytosolic glutamine synthetase (GS1 α) mRNA. The most striking result was that the GS1 α gene was induced in all the fungus-infected leaves, independent of the strain used for inoculation, and that GS1 α expression paralleled the PAL3 and CHS defence gene expression. It is concluded that a role of GS1 α in plant defence has to be considered.

Keywords: Amino acids; glutamine synthetase; nitrogen remobilization; senescence

Journal Article.  6238 words.  Illustrated.

Subjects: Plant Sciences and Forestry

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