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 retardedhypocotyle elongation caused by gibberellic acid. This inhibitoryeffect of cotyledon excision was alleviated by incubating decotylizedseedlings with a hot water extarct from excised cotyledons orintact seedlings. This active principle was identified as dihydroconiferylalcohol on the basis of its IR, NMR and mass spectra. (Received August 28, 1973; )