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Photocontrol of Mimosa pudica L. leaf movement

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Summary

  1. 1.

    Mimosa pudica L. pinnae close in darkness when phytochrome is predominantly in the far-red-absorbing form (Pfr) and remain open when Pfr is low [6]. The leaflets remain open, however, in normal light periods irrespective of the form of phytochrome. Pinnae, after closing in darkness, regularly reopen in light.

  2. 2.

    An action spectrum for the opening response shows maxima for effectiveness near 710 and 480 nm. This action spectrum is similar to that for a high-energy response affecting morphogenesis in many plants.

  3. 3.

    Dropping of the petiole of M. pudica can be photostimulated by irradiation of the primary pulvinus after holding the plants in darkness [4].

  4. 4.

    The photostimulation of the primary pulvinus is effective only at wavelengths less than 520 nm. Wave bands in the region of 400 to 470 nm are about equally effective.

  5. 5.

    These photoresponses of M. pudica are related to current discussion about the nature of the high-energy and phytochrome photomorphogenic reactions.

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Fondeville, J.C., Schneider, M.J., Borthwick, H.A. et al. Photocontrol of Mimosa pudica L. leaf movement. Planta 75, 228–238 (1967). https://doi.org/10.1007/BF00386322

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  • DOI: https://doi.org/10.1007/BF00386322

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