Lavender as a source of novel plant compounds for the development of a natural herbicide.

摘要: In a previous study, lavender (Lavandula spp.) was found to be highly phytotoxic towards annual ryegrass (Lolium rigidum, ARG), major weed of winter wheat crops in Australia. This research aimed further explore this relationship and determine the chemical(s) responsible for observed effect. bioassay, it determined that stem leaf extract L. x intermedia cv. Grosso ranked highest had potential reduce significantly root growth several plant species. An concentration 10% almost completely inhibited ARG growth. When tested stability, there no loss phytotoxicity after 256 day trial. Via bioassay-guided fractionation chromatographic techniques, sub-fraction consisting coumarin 7-methoxycoumarin most ARG. Chemoassays 18 structural analogues showed itself largely extract. Soil trials were conducted using pure extract, both instances, shoot length weight reduced by post-emergence application at all concentrations evaluated.