The experiments we are about to describe started1 as a new approach to an old problem—the mechanism of gravity perception in plants. All higher plants are sensitive to gravity; indeed the oriented growth of organs such as roots, shoots, and leaves is governed primarily by it. If a plant organ is by any means displaced from its normal direction of growth, certain regions of the organ sensitive to gravity will perceive the change and then, by a hormone-mediated mechanism, will induce one side of the organ to grow faster than the other, producing a curvature tending to restore the normal orientation to the growing part of the organ. The sensitive areas are usually the extreme apical regions.
KeywordsHelianthus Annuus Avena Sativa Magnetic Gradient Pole Piece Protoplasmic Streaming
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