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Flavonoids in roots of white clover: interaction of arbuscular mycorrhizal fungi and a pathogenic fungus

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Abstract

The effects of two arbuscular mycorrhizal fungi (AMF) (Glomus mosseae and G. claroideum) and a pathogenic fungus (Pythium ultimum) on the production of eight flavonoids in roots of two white clover (Trifolium repens L.) cultivars were evaluated. Quantification of AM and pathogenic fungi in the roots showed that the AM symbiosis significantly reduced P. ultimum biomass and in some cases prevented infection. The flavonoid productions in clover roots varied depending on the presence of beneficial and/or pathogenic fungi, fungal isolate or plant cultivar. Only plants colonized with G. claroideum showed detectable concentrations of either coumestrol or kaempferol (cultivar-dependant). In addition, inoculation with G. claroideum resulted in significantly higher concentrations of coumestrol in cv. Sonja and medicarpin in cv. Milo. A low production of coumestrol and kaempferol in mycorrhizal plants may be G. mosseae-specific. Only the concentrations of formononetin and daidzein increased in clover roots in response to infection with P. ultimum. These flavonoids are supposedly stress metabolites, synthesized or produced from glycosides in response to pathogen infection. However, the presence of one or both AMF significantly lowered the formononetin and daidzein concentrations, and overruled the inductive effect of P. ultimum. Therefore the antagonistic action of AM against the pathogen must take place through another mechanism.

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Acknowledgment

We thank Dr. Paul M. Dewick, University of Nottingham, England, for providing a sample of medicarpin.

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  1. A. Understrup

    Present address: Bayer CropScience, Marketing, Nørgaardsvej 32, 2800, Kgs. Lyngby, Denmark

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  1. University of Aarhus, Faculty of Agricultural Sciences, Department of Integrated Pest Management, Research Centre Flakkebjerg, 4200, Slageise, Denmark

    S. C. K. Carlsen, A. Understrup, I. S. Fomsgaard, A. G. Mortensen & S. Ravnskov

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  1. S. C. K. Carlsen
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Correspondence to S. Ravnskov.

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Responsible editor: Petra Marschner

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Carlsen, S.C.K., Understrup, A., Fomsgaard, I.S. et al. Flavonoids in roots of white clover: interaction of arbuscular mycorrhizal fungi and a pathogenic fungus. Plant Soil 302, 33–43 (2008). https://doi.org/10.1007/s11104-007-9452-9

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