title: The bioassay of gibberellins.
abstract: A bioassay is described which is dependent upon the fact that gibberellin induced α-amylase release from barley half-seeds is proportional to the logarithm of gibberellin concentration applied. This bioassay has been successfully applied to the estimation of gibberellin-like substances in plant extracts. The bioassay has the following advantages: 1) Release of α-amylase is one step closer to the primary site of action of GA; 2) release of α-amylase is not affected by solvent residues and is apparently completely specific for gibberellin; 3) release of α-amylase is not affected by substances other than gibberellins present in crude plant extracts.
authors.affiliation: MSU/AEC Plant Research Laboratory, Michigan State University, East Lansing, Michigan.
authors.forename: R L
authors.initials: RL
authors.lastname: Jones
authors.forename: J E
authors.initials: JE
authors.lastname: Varner