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By Dortort F.

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Bot. 37, 693-704. Lee, J. , Mulkey, T. J. and Evans, M. L. (1983). Plant Physiol. 73, 874-876. -X. -Y. (1986). J . Histochem. Cytochem. 34, 561-567. Lohmann, K. J. and Willows, A. 0. D. (1987). Science 235,331-334. MacLean-Fletcher, S. D. and Pollard, T. D. (1980). J. Cell Biol. 85,414428. Merkis, A. , Laurinavichyus, R. S. and Shvyagzhdene, D. V. (1985). Izvest. Akad. Nauk SSSR: Ser. Fizich. 49,715-723. Mertens, R. and Weiler, E . W. (1983). Planta 158, 339-348. Methfessel, C. and Sakmann, B. (1986).

To learn something about the susception of gravity, the most interesting difference in apparent nonstatolith systems, susception (and perception) must be studied rather than growth. The parameters to measure would be the site of perception, sensitivity to small stimuli, the presentation time and whether the reciprocity rule (Johnson, 1965) holds. There are very few data on gravity sensing in organisms which appear never to use statoliths, so there is very little basis for guessing how they might perceive gravity.

1982). More frequent opening of a Ca2+channel in the amyloplast membrane would cause a locally elevated Ca2+concentration. This region of higher Ca2+would be a directional signal when amyloplasts are only in the lower part of the cell. A Ca2+channel in the amyloplast membrane, attached to microfilaments anchored at the end of the cell where the amyloplasts are in vertical tissues, would cause a rise in Ca2+in the lower part of the cell. , 1987). Should such channels be at the other end of the cytoskeletal connection, in the plasma membrane, sedimenting amyloplasts would not create a directional signal.

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