Hydrotropism interacts with gravitropism by degrading amyloplasts in seedling roots of Arabidopsis and radish1 From: Plant Physiology | Date: June 1, 2003| Author: Higashitani, Atsushi; Kobayashi, Akie; Takahashi, Hideyuki; Yamazaki, Yutaka; Takahashi, Nobuyuki | Copyright American Society of Plant Physiologists Jun 2003. Provided by ProQuest LLC.Copyright information

In response to a moisture gradient, roots exhibit hydrotropism to control the orientation of their growth. To exhibit hydrotropism, however, they must overcome the gravitropism that is dominant on Earth. We found that moisture gradient or water stress caused immediate degradation of the starch anchors, amyloplasts, in root columella cells of Arabidopsis and radish (Raphanus sativus). Namely, development of hydrotropic response was accompanied by a simultaneous reduction in starch content in c...

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