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Articles

Specific Inhibition of Phototropism in Corn Seedlings ¹

^a Michigan State University-Energy Research and Development Administration, Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824

Geotropism was used as a control for the specificity of potential inhibitors of phototropism by the coleoptiles of corn (Zea mays) seedlings. The compounds tested fall into three categories showing: (a) no inhibition of either phototropism or geotropism (KCl); (b) nonspecific inhibition of both phototropism and geotropism (KCN); and (c) specific inhibition of phototropism (KI, NaN₃, and phenylacetic acid). Simultaneous irradiation of coleoptiles with phototropically inert light in addition to the phototropically active blue light also results in an inhibition of phototropism. Since azide, iodide, and phenylacetic acid are known to interact with flavins while a simultaneous irradiation with a phototropically inert light may depopulate the first triplet state of flavins, these data support the hypothesis that the photoreceptor pigment for phototropism in corn is a flavin.

³ Present address: Department of Botany, University of Aberdeen, Aberdeen, U.K.

⁴ To whom reprint requests should be addressed.

¹ This work was initiated by W. S. in the laboratory of W. L. Butler at the University of California at San Diego supported in part by National Institutes of Health Grant GM-20648 to W. L. B. and continued at Michigan State University supported by U.S. Energy Research and Development Administration Contract EY-76-C-02-1338 and Deutsche Forschungsgemeinschaft grant SCH-383 to W. S.

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