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Differential interactions of Verticillium longisporum and V. dahliae with Brassica napus detected with molecular and histological techniques

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Abstract

The differential interactions of V. longisporum (VL) and V. dahliae (VD) on the root surface and in the root and shoot vascular system of Brassica napus were studied by confocal laser scanning microscopy (CLSM), using GFP tagging and conventional fluorescence dyes, acid fuchsin and acridin orange. VL and VD transformants expressing sGFP were generated by Agrobacterium-mediated transformation. GFP signals were less homogenous and GFP tagging performed less satisfactory than the conventional fluorescence staining when both were studied with CLSM. Interactions of both pathogens were largely restricted to the root hair zone. At 24 h post-inoculation (hpi), hyphae of VL and VD were found intensely interwoven with the root hairs. Hyphae of VL followed the root hairs towards the root surface. At 36 hpi, VL hyphae started to cover the roots with a hyphal net strictly following the grooves of the junctions of the epidermal cells. VL started to penetrate the root epidermal cells without any conspicuous infection structures. Subsequently, hyphae grew intracellularly and intercellularly through the root cortex towards the central cylinder, without inducing any visible plant responses. Colonisation of the xylem vessels in the shoot with VL was restricted to individual vessels entirely filled with mycelium and conidia, while adjacent vessels remained completely unaffected. This may explain why no wilt symptoms occur in B. napus infected with VL. Elevated amounts of fungal DNA were detectable in the hypocotyls 14 days post-inoculation (dpi) and in the leaves 35 dpi. Root penetration was also observed for VD, however, with no directed root surface growth and mainly an intercellular invasion of the root tissue. In contrast to VL, VD started ample formation of conidia on the roots, and was unable to spread systemically into the shoots. VD did not form microsclerotia in the root tissue as widely observed for VL. This study confirms that VD is non-pathogenic on B. napus and demonstrates that non-host resistance against this fungus materializes in restriction of systemic spread rather than inhibition of penetration.

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Acknowledgements

We are grateful to the breeding companies represented by the GFP (Gemeinschaft zur Förderung der privaten deutschen Pflanzenzüchtung e.V.) for constant support and fruitful cooperation. The funding of this study by GFP and FNR (German Ministry of Food, Agriculture and Consumer Protection) is acknowledged.

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  1. Plant Pathology and Plant Protection Division, Department of Crop Sciences, Faculty of Agriculture, Georg-August University Göttingen, Grisebachstraße 6, 37077, Goettingen, Germany

    C. Eynck, B. Koopmann & A. von Tiedemann

  2. Molecular Phytopathology and Mycotoxin Research Division, Department of Crop Sciences, Faculty of Agriculture, Georg-August University Göttingen, Grisebachstraße 6, 37077, Goettingen, Germany

    P. Karlovsky

  3. Institute for Plant Diseases and Plant Protection, University of Hannover, Herrenhäuser Strasse 2, 30419, Hannover, Germany

    G. Grunewaldt-Stoecker

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Eynck, C., Koopmann, B., Grunewaldt-Stoecker, G. et al. Differential interactions of Verticillium longisporum and V. dahliae with Brassica napus detected with molecular and histological techniques. Eur J Plant Pathol 118, 259–274 (2007). https://doi.org/10.1007/s10658-007-9144-6

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