The developing seeds of grape (cvs. Black Muscat and Julski Muscat) showed a high level of endogenous auxins, gibberellins and cytokinins like substances during the 3rd and 4th week after anthesis, which decreased thereafter during the 5th and 6th week. Again an increase in the levels of auxins and gibberellins was noticed during the 7th and 8th week. The cytokinins disappeared during the 5th week and were not traced at any stage up to the ripening of berries. The level of inhibitors increased progressively from 3rd week onwards and reached highest level as the berry ripened. Except for the 7th week when the neutral auxins predominated at almost all Rf zones, the acidic auxins were dominant at all stages and at almost all Rf zones in both the cultivars.
