Abstract
The induction of flowering by one long day (LD) in the grass Lolium temulentum is most closely mimicked by application of the gibberellins (GAs) GA 5 or GA 6, both of which occur naturally. These gibberellins promote floral development but have little effect on stem elongation. Endogenous GA 5 and GA 6 contents in the shoot apex double on the day after the LD and, for GA 5 (and we presume for GA 6 as well) reach a concentration known to be inductive for the excised shoot apex in vitro. They are, therefore, strong candidates as LD floral stimuli in this grass. The synthesis of GA 6 and an examination of its florigenic properties in L. temulentum are described.
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