Plant growth regulators in seeds of Cucurbita pepo L. I. Isolation of plant growth regulators from seeds of Cucurbita pepo L.

A survey of plant growth regulators in seeds of Cucurbita pepo L. led to the isolation of three new gibberellins A39, A49 and A49, a new kaurenolide, and six plant growth regulators (a new compound named cucurbic acid, cucurbic acid glucoside, methyl cucurbate glucoside, (+)-abscisic acid, 9,10-dihydroxy-12-octadecenoic acid and its methyl ester) together with three abscisic acid-related compounds [(+)-2-trans-abscisic acid, (+)-dehydrovomifoliol and (+)-vomifoliol].