Abstract
It has been reported that germinating sunflower seeds have a species-selective allelopathic function. We have already isolated and identified a substance, 4,15-dinor-3-hydroxy-1(5)-xanthene-12,8-olide (sundiversifolide), as an allelochemical from the exudates of germinating sunflower seeds. It has a possibility that there are several allelopathic substances except for sundiversifolide in the exudates of sunflower seeds, because the amount of sundiversifolide exudates from a seed was too little to explain the total allelopathic activity by just only it. In this study, one of the active substances in exudates was isolated. We discuss the details of the isolated substance as allelochemical in sunflower plant.
