Chemical Factors Controlling Floral Bud Formation of Torenia Stem Segments Cultured in Vitro II. Effects of Growth Regulators

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Correlative effects between growth regulators added to a medium and different physiological states of explants on adventitious bud formation and flowering were investigated using Torenia stem segments cultured in vitro. Indoleacetic acid stimulated floral bud formation and its development in explants taken from reproductive plants. These stimulative effects were clearly seen in explants taken from plants in which flower abscission was taking place, but insignificant when explants were prepared from younger materials. Abscisic acid acted in a reverse way to auxin, greatly promoting floral bud initiation and flowering of originally vegetative explnts. Zeatin at a concentration of 1 mg/liter inhibited floral bud formation, and at a low concentrations it was generally ineffective. However, floral bud formation and flowering of explants taken either from basal parts of stems or from 18- to 20-week-old plants were promoted by zeatin treatment. The action of gibberellic acid seemed rather indirect: at a concentration of 0.01 mg/liter, it generally stimulated floral bud formation but at a concentration of 1 mg/liter, it was often inhibitory.
日本植物生理学会の論文