Susceptibility of wild carrot (Daucus carota ssp. carota) to Sclerotinia sclerotiorum |
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Authors: | B D Jensen M R Finckh L Munk T P Hauser |
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Institution: | 1. Department of Plant Biology, Faculty of Life Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871, Frederiksberg C, Denmark 2. Department of Agricultural Sciences, Faculty of Life Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871, Frederiksberg C, Denmark 3. Faculty of Organic Agricultural Sciences, University of Kassel, 37213, Witzenhausen, Germany 4. Department of Ecology, Faculty of Life Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871, Frederiksberg C, Denmark
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Abstract: | Sclerotinia soft rot, caused by Sclerotinia sclerotiorum, is a severe disease of cultivated carrots (Daucus carota ssp. sativus) in storage. It is not known whether Sclerotinia soft rot also affects wild carrots (D. carota ssp. carota), which hybridise and exchange genes, among them resistance genes, with the cultivated carrot. We investigated the susceptibility
of wild carrots to S. sclerotiorum isolates from cultivated carrot under controlled and outdoor conditions. Inoculated roots from both wild and cultivated plants
produced sclerotia and soft rot in a growth chamber test. Two isolates differed significantly in the ability to produce lesions
and sclerotia on roots of both wild carrots and cv. Bolero. Flowering stems of wild carrots produced dry, pale lesions after
inoculation with the pathogen, and above-ground plant weight was significantly reduced 4 weeks after inoculation in a greenhouse
test. Wild and cultivar rosette plants died earlier and fewer plants survived when inoculated with the pathogen under outdoor
test conditions. Cultivar plants died earlier than wild plants, but survived as frequently. Plants inoculated in the crown
died earlier and at a lower frequency than plants inoculated on leaves. Wild carrots may thus serve as a host of S. sclerotiorum and thus eventually benefit from any uptake of resistance genes, among them transgenes, via introgression from cultivated
carrots. |
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Keywords: | Pathogenicity Risk assessment Genetically modified crops Wild plant– pathogen interactions |
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