Immature seeds of loquat (Eriobotrya japonica) were collected from developing fruits 90 days after full bloom. After purifying the acidic ethyl acetate-soluble fraction by several chromatographic ...procedures, gibberellin fractions were surveyed by combined gas-liquid chromatography/mass spectrometry. Consequently, GA
9
, GA
15
,GA
24
, GA
35
, and GA
50
were identified. Additionally, six GA-like substances were detected, and two were determined to be new GAs, GA
80
(11β-hydroxy-GA
7
), and GA
84
(11β-hydroxy-GA
9
). Based on these results, an early-11-hydroxylation biosynthetic pathway in the seed of loquat is suggested.
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