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. 1977 Nov;60(5):736–738. doi: 10.1104/pp.60.5.736

Specific Inhibition of Phototropism in Corn Seedlings 1

Werner Schmidt a,2, James Hart a,3, Philip Filner a, Kenneth L Poff a,4
PMCID: PMC542704  PMID: 16660174

Abstract

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.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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