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Phototropism. II

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Summary

The major revisions which we must make in our ideas concerning phototropism are the following:

  1. a)

    Perception of blue light by phototropically reactive plant parts may be mediated by one or more of several pigments, all of whose absorption spectra agree reasonably well with the action spectrum for phototropism. These pigments include various carotinoids and riboflavin-containing compounds.

  2. b)

    Lateral transport of auxin under the influence of light, long accepted as a mechanism explaining the auxin changes which accompany phototropic bending, has not been unequivocally demonstrated. The data could equally well be interpreted in terms of a disturbance of a substrate-limited auxin-producing mechanism at the apex of the coleoptile and other plant organs.

  3. c)

    Indoleacetic acid can participate in light-growth reactions by virtue of its rapid photoinactivation in the presence of the proper sensitizing pigments.

  4. d)

    Photoinactivation of auxin may be readily demonstrated in vitro and in vivo, but the relation of auxin photoinactivation to phototropism is still not clear. The effect of light on auxin levels of tissues may be mediated not only by a photoinactivation mechanism but also by a stimulation or inhibition of the auxinproducing process, as well as through effects on auxin migration.

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  1. California Institute of Technology, Pasadena

    Arthur W. Galston

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Supplement to article in The Botanical Review5: 655–681. 1939.

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Galston, A.W. Phototropism. II. Bot. Rev 16, 361–378 (1950). https://doi.org/10.1007/BF02869991

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