Phytohormones and light regulation of the growth habit in peanuts : Arachis hypogaea L.

概要

論文の詳細を見る
Diageotropic side branches in runner type peanuts assume an orthotropic position when grown in the dark but return to a plagiotropic postition when transferred back to light. The effect of light on the trailing habit of lateral branches depends on the quality and intensity of the light taking place under blue+ far red light, but not under blue alone. Light intensity below 28 Kergs・cm^2・sec^1 changed the growth of the runner's laterals from trailing to erect. Inhibitors of both GA and auxin activity were higher in the laterals of runners than in those of the erects. Along with the change in the trailing habit by low light intensity, a decrease in inhibitor level was observed. Gibberellin-like activity was smaller in both extracts and diffusates of the growing tip of lateral branches than in the main axis. An inhibitor found only in lateral branches of runner type plants could be detected in erect plants in the presence of auxin. The predominant factor controlling differences in the growth habit of side branches of the erect and runner types is the presence of an inhibitor; while, within each type, levels of gibberellin seem to account for the different growth habit of the axis and laterals.