Diurnal Geotropic responses of the Primary Leaves of Phaseolus vulgaris

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When seedlings of Phaseolus vulgaris with leaves in the daytime position (almost horizontal to the ground) were turned upside-down during the light period, their leaves moved upward away from the ground after about 20 min and ceased moving after about 1.5 h. But when seedlings with leaves in the night time position (directed downward) were turned upside-down, their leaves moved downward toward the ground after about 30 min and stopped moving about 2 h later. Thus, Phaseolus primary leaves showed positive or negative geotropic responses that correspohded to the dark or light period. This geotropic response of primary leaves was accompanied by the redistribution of k^+, Cl^- and NO_3^- in the laminar pulvinus. These facts suggest that the circadian endogenous clock that is assumed to exist in Phaseolus vulgaris has at least two regulation mechanisms; one which measures time and another which determines leaf postition in relation to gravity by changing the ion distribution in the pulvinus.
日本植物生理学会の論文