Abstract
We have already isolated one of bioactive substance and identified as 4,15-dinor-3-hydroxy-1(5)-xanthene-12,8-olide (sundiversifolide) from the exudates of germinating sunflower seeds.Sunflower seeds released a large amount of sundiversifolide in the initiation of their incubation but the quantity of the substances gradually reduced after germination. It has been found that sundiversifolide exist in the pericarp of sunflower seeds. On the other hand, it was not detected in the extracts of 6 day sunflower seedlings. In this study, we investigated the distribution of endogenous sundiversifolide in flower, flower bud, leaf, stem and root, of mature sunflower plants, and discussed the function of this substance for sunflower plants. Sundiversifolide was detected in the extract of flower bud and leaf. These results suggest that sundiversifolide is synthesized in mature sunflower and release to the environment during seed germination.
