Plant Physiol. Illumina
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Plant Physiology 67:1011-1015 (1981)
© 1981 American Society of Plant Biologists

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Mechanism of Specific Inhibition of Phototropism by Phenylacetic Acid in Corn Seedling 1

Richard D. Vierstra and Kenneth L. Poff

MSU-DOE Plant Research Laboratory, Michigan State University East Lansing, Michigan 48824

Using geotropism as a control for phototropism, compounds similar to phenylacetic acid that photoreact with flavins and/or have auxin-like activity were examined for their ability to specifically inhibit phototropism in corn seedlings using geotropism as a control. Results using indole-3-acetic acid, napthalene-1-acetic acid, naphthalene-2-acetic acid, phenylacetic acid, and {beta}-phenylpyruvic acid suggest that such compounds will specifically inhibit phototropism primarily because of their photoreactivity with flavins and not their auxin activity. For example, strong auxins, indole-3-acetic acid and naphthalene-1-acetic acid, affected both tropic responses at all concentrations tested whereas weak auxins, phenylacetic acid and naphthalene-2-acetic acid, exhibited specific inhibition. In addition, the in vivo concentration of phenylacetic acid required to induce specificity was well below that required to stimulate coleoptile growth. Estimates of the percentage of photoreceptor pigment inactivated by phenylacetic acid (>10%) suggest that phenylacetic acid could be used to photoaffinity label the flavoprotein involved in corn seedling phototropism.

1 This work was supported by the United States Department of Energy under Contract DE-ACO2-76ER01338.




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C. W. Whippo and R. P. Hangarter
Phototropism: Bending towards Enlightenment.
PLANT CELL, May 1, 2006; 18(5): 1110 - 1119.
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