Allelopathic Effects of Rumex crispus on Amaranthus retroflexus, Grain Sorghum and Field Corn
Field observations of vegetational patterning suggested that R. crispus, a common species of field margins and wastelands, might be allelopathic. Tests on seedling growth showed several dilutions of aqueous fresh-leaf R. crispus extracts significantly inhibited Amaranthus retroflexus, grain sorghum and field corn. Chromatography of these extracts established the presence of three phenolics which inhibited grain sorghum and radish in germination bioassays. These phytotoxins were characterized in several solvent systems, but attempts at identification were not successful. Field sampling showed a reduced plant biomass in quadrats near R. crispus and several species were found better established away from R. crispus. These data suggest that allelopathy may be important in the early invasion of waste areas by R. crispus.
sorghum, seed germination, corn, radishes, plants, nutrient solutions, paper chromatography, indoleacetic acids
Einhellig, Frank A., and James A. Rasmussen. "Allelopathic effects of Rumex crispus on Amaranthus retroflexus, grain sorghum and field corn." American midland naturalist (1973): 79-86.
American midland naturalist