| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1995: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1994: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1993: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Research Abstract |
The mechanism of gravity perception has been a main problem in the study of plant gravitropism, but the mechanism is little known. At present, the columella cell in root tip, and the inner cortical layr cell, starch sheath cell, which surround the vascular bundles of plant shoot, have been considered as the gravity perception cells. The sensor of gravity information has been believed to be the starch containing amyloplasts in these cells.
In this study, the graviperception mechanism of the hypocotyl of radish seedling was studied. The ultrastructural observation of inner cortical "gravity perception cells" revealed the presence of characteristic bundle of plasmodesmata at the outer tangential wall of these cells. In this study, to combine this observation with the assumption that the gravitropism controlling substance is contained within and released from amyloplast itself, a novel hypothesis on the mechanism of plant graviperception is proposed. The plasmodesmata play a main role in this hypothesis on plant gravitropism.
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