4. 重力刺激によって誘導されるダイコン下胚軸の偏差成長

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It has been generally believed that gravistimulation induces the transport of endogenous auxin from the upper side to the lower side, which result in cell elongation on the upper side declines while cell elongation on the lower side increase. The theory is often the only explanation of tropism given in plant physiology in texts. There is, however, evidence in the literature which is not entirely consistent with this theory. Therefore, the detailed studies on the differential growth between the upper and lower sides during gravitropic curvature are needed in order to rigorously test models of shoot gravitropism. The present study provides such data for radish hypocotyls. The hypocotyls curvature and the growth rates on the upper and lower sides of the hypocotyls before and after gravitropic stimulation were measured using an IR-imaging system. The hypocotyls began to bend upwards 10min after the onset of gravitropic stimulation. The growth rate on the upper side was markedly suppressed shortly after onset of gravitropic stimulation, whereas that on the lower side was accelerated 40-60min later. Possibly, the acceleration of growth on the lower side is rather the result than a cause of gravitropic stimulation. These results suggest that gravitropic curvature in radish hypocotyls depended on the magnitude of growth suppression on the upper side at an unchanged growth rate on the lower side in a manner similar to phototropic curvature.
植物化学調節学会の論文
2004-10-13

4. 重力刺激によって誘導されるダイコン下胚軸の偏差成長

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