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The allelopathic potential of common dandelion ( Taraxacum officinale WEB.)

Summary
The common dandelion (Taraxacum officinale WEB.) is one of the most troublesome weeds in meadows, pastures, grasses, turf grasses, orchards and vineyards.
The aim of this study was to establish the allelopathic effect of the perennial dicotyledonous weed and to ascertain to what degree is it able to influence the germination of grass species widespread in turfs. Seed of selected Gramineae and Fabaceae species(Lolium perenne L., Arrhenatherum elatior L., Festuca rubra L., Dactylis glomerata L., Poa pratensis L., Lotus corniculatus L., Trifolium repens L., Trifolium fragiferum L., Bromus inermis L., Bromus erectus L.),which are regarded as important components of turfs, were treated with acetonic, ethanolic and aqueous extracts of T. officinale roots and leaves. The effect of treatments was evaluated by determining seed germination of the test species.
The acetone and ethanol extracts of dandelion roots generally inhibited seed germination the most. Aqueous, acetone and ethanol extracts of leaves were generally less inhibitive. Germination of test species’ seed decreased as extract concentrations increased.

german version

Keywords/Stichworte:Allelopathy; Taraxacum officinale ; Gramineae species; Fabaceae species; germination

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Autor:V. GYENES, I. BÉRES, Institute for Plant Protection, Department of Herbology and Pesticide Chemistry, University of Veszprém, Georgikon Faculty of Agriculture, H-8361 Keszthely, P.O.Box 71. Hungary, e-mail: gyenes@georgikon.hu

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