| Popis: |
Studying the influence of cogongrass (Imperata cylindrica L.)extract on germination and seedling growth of some weeds and cropsindicated that the dicotyledonous weeds such as goosefoot and sowthistlewere the most affected by the aqueous extract of cogongrass (rhizome andfoliage) than the monocotyledonous crops, wheat and onion, based onIC50 values. Delay in germination was more pronounced in weeds thancrops. Dry weight of wheat and onion seedlings were not significantlyaffected meanwhile the dry weight of goosefoot, fieldbind and sowthistleseedlings were significant, by lower than control. Rhizome extract wasgenerally more effective than foliage extract. Allelochemicals incogongrass (rhizome and foliage) analyzed by liquidchromatography/mass spectrometry (LC/MS) were identified as phenoliccompounds that included 3'-o-methyl-(-)-epicatechin-7-o-sulphate,vanillic, ferulic and coumaric acids in rhizome extract, in addition to (-)-epigallocatechin-3,5-digallate, caffeic and gallic in foliage extract.Chlorogenic acid was the principal phenolic compound in both extracts.These results suggest that cogongrass might have an inhibitory effect.Considering that cogongrass is an allelopathic plant might suggest its useas soil additive material for weed control and could also serve as naturalherbicide. |
