THE BIOSYNTHESIS OF ABSCISIC ACID IN CERCOSPORA ROSICOLA

Article abstract of DOI:10.1016/0031-9422(82)80015-0

1'-Deoxyabscisic acid (1'-deoxy-ABA) has been isolated from cultures of Cercospora rosicola which are actively synthesizing abscisic acid (ABA).Mevalonic acid is incorporated into ABA and 1'-deoxy-ABA by this fungus.The identity of this compound has been confirmed by synthesis. 3H-labelled 1'-deoxy-ABA is efficiently converted into ABA by C. rosicola.Thus it is proposed that 1'-deoxy-ABA is the immediate biosynthetic precursor of ABA. - Key Word Index - Cercospora rosicola; abscisic acid; 1'-deoxyabscisic acid; biosynthesis of abscisic acid; mevalonic acid.