Isolation and chemical identification of a lettuce cotyledon factor, a synergist of the gibberellin action in inducing lettuce hypocotyl elongation

Removal of cotyledons from intact lettuce seedlings retarded hypocotyle elongation caused by gibberellic acid. This inhibitory effect of cotyledon excision was alleviated by incubating decotylized seedlings with a hot water extarct from excised cotyledons or intact seedlings. This active principle was identified as dihydroconiferyl alcohol on the basis of its IR, NMR and mass spectra.