Geotropic response of cucumber hypocotyls

概要

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Exogenous auxin applied to the apical bud of intact cucumber seedlings promoted elongation of the hypocotyl, mostly of the apical zone (zone I) and to a lesser extent, the middle and basal zones (zones II and III). Geotropic curvature was clearly observed 30 min after geostimulation. The curvature began at zone I and moved toward the basal zones with prolonged geostimulation. Decapitation (removal of apex and cotyledons) did not produce any appreciable effect on the geotropic response, but the curvature was reduced with the removal of zone I. Auxin application to seedlings without zone I restored their ability to respond to gravity. The lower epidermis of horizontally oriented hypocotyls played a more important role than the upper in the geotropic response. The extensibility of the lower epidermal cell wall was increased significantly by the geostimulus before the onset of the curvature response.
日本植物生理学会の論文