The gravisensitivity of plants is exceedingly high. So, for instance, the presentation time of cress roots is only 12 seconds; the threshold value which plants sense as a stimulus is between 10-3 and 10-4 g. Statoliths serve for the perception of a gravity stimulus. They are particles (starch-containing amyloplasts in higher plants) within specialized cells, the statocytes, which sediment at 1 g.

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© Springer Fachmedien Wiesbaden 1984

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  • Andreas Sievers

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