The allelochemical characterization of velvetleaf (Abutilon theophrasti Medic.).
Velvetleaf (Abutilon thephrasti Medic.) is one of the most important invasive weed species in Hungary. Its dangerousness come from its hard allelopathic effect and competitive ability. Many authors proved its effect on crop yield. Some of the authors state that allelopathy is responsible for the crop reduction, while based on the opinion of others competition is the main reason for reducing crop yield. Until now arginine which is in the seeds, free amino acids and phenoloids from shoots are believed to cause inhibitory effect. In our study we examinated the volatile substances and the phenoloid compounds of the plant. The volatile substances from Abutilon shoots were isolated with SPME-GC/MS analysis, while thin-layer chromatography was used for detection of phenoloids from seeds and plants at different phenological phases. Among the well-known terpenoids the limonene, β-cubeben and safranal were detected. Special compound was the trimethyl-cyclopentenone. The occurrence of benzaldehide and benzyl-acetaldehide were notable too. Among phenoloids, the occurrence of quercetin-rutoside was detected from the shoots.