The Relationship of Endogenous Gibberellins to Light-regulated Stem Elongation Rates in Dwarf and Normal Cultivars of Pisum sativum L.

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Dwarf cultivar Progress No. 9 and normal cultivar Alaska of Pisum sativum L. were grown under conditions of darkness or red light. Red light decreased the stem elongation rate of both cultivars. Gibberellins present during the linear phase of stem elongation were isolated and the two main components were tentatively identified by gas chromato-chromatography and mass spectrometry as Gibberellin A_1 and A_5. Both gibberellins varied quantitatively within and between cultivar and treatment groups, and the amounts present were inversely related to stem elongation rate. Although the stem elongation rate of plants grown under red light was repressed, endogenous gibberellin was not limiting and was as much as two-fold higher in red light-grown plants than in dark-grown plants. The levels of endogenous gibberellin in dawrf plants indicated that the genetic growth limitation was not due to a gibberellin deficiency.
日本植物生理学会の論文