Identification of gibberellins A 17, A 25, A 45, abscisic acid, phaseic acid, and dihydrophaseic acid in seeds of Pyrus communis

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Abstract Gibberellin A17, abscisic acid, and 4′-dihydrophaseic acid were identified by GC-MS of derivatized extracts from both immature and mature seeds of pear. Immature seeds also contained phaseic acid, gibberellins A25 and A45, and two presumed mono-hydroxylated derivatives of GA45, one of which was tentatively identified as 3β-hydroxy-GA45. Several presumed metabolites of abscisic acid were detected in both mature and immature seeds.