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Impaired colonization and infection of tomato roots by the Δfrp1 mutant of Fusarium oxysporum correlates with reduced CWDE gene expression
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Jonkers, Wilfried, Rodrigues, Christopher D.A. and Rep, Martijn (2009) Impaired colonization and infection of tomato roots by the Δfrp1 mutant of Fusarium oxysporum correlates with reduced CWDE gene expression. Molecular Plant-Microbe Interactions, 22 (5). pp. 507-518. doi:10.1094/mpmi-22-5-0507 ISSN 0894-0282.
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Official URL: http://dx.doi.org/10.1094/mpmi-22-5-0507
Abstract
The vascular wilt pathogen Fusarium oxysporum f. sp. lycopersici efficiently invades roots and colonizes vascular tissues of its host tomato. For these processes, the F-box protein Frp1 is required. The Fusarium oxysporum Δfrp1 mutant was characterized in detail to uncover the cause of its colonization defect. Using growth assays, we could attribute poor root colonization to reduced assimilation of organic acids, amino acids (except proline), or polysaccharides, singly or in combination. External root colonization by the Δfrp1 mutant is restored by the addition of 0.1% glucose or proline but infection still does not occur. This is due to the inability of the Δfrp1 mutant to penetrate the roots, as demonstrated by the lack of expression of SIX1 in the Δfrp1 strain, which is a gene exclusively expressed inside roots, and loss of cell wall–degrading enzyme (CWDE) gene expression. Many of the metabolic defects of the Δfrp1 strain can be attributed to reduced expression of the ICL1 (isocitrate lyase) gene. Strikingly, an Δicl1 mutant is still fully pathogenic and capable of external root colonization. We conclude that the inability of the Δfrp1 strain to colonize and invade roots is not primarily due to metabolic defects but can be attributed to reduced expression of several CWDE genes.
Item Type: | Journal Article | ||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) | ||||||
Journal or Publication Title: | Molecular Plant-Microbe Interactions | ||||||
Publisher: | American Phytopathological Society | ||||||
ISSN: | 0894-0282 | ||||||
Official Date: | 6 April 2009 | ||||||
Dates: |
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Volume: | 22 | ||||||
Number: | 5 | ||||||
Page Range: | pp. 507-518 | ||||||
DOI: | 10.1094/mpmi-22-5-0507 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) |
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