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. 1983 May;72(1):219–224. doi: 10.1104/pp.72.1.219

Calmodulin-Binding Drugs Affect Responses to Cytokinin, Auxin, and Gibberellic Acid 1

Daphne C Elliott 1, Susan M Batchelor 1, Rachel A Cassar 1, Nicos G Marinos 1
PMCID: PMC1066199  PMID: 16662964

Abstract

Trifluoperazine, a phenothiazine tranquilizer, and tetracaine, a local anesthetic, have been found to inhibit a variety of plant hormone responses at concentrations compatible with their known inhibition of Ca2+-calmod-ulin-dependent enzyme activities. Among these responses are cytokinin-dependent betacyanin synthesis and increase in fresh weight in Amaranthus tricolor cotyledons, auxin-dependent increase in length of wheat coleoptile segments and gibberellic acid-dependent induction of α-amylase synthesis in barley aleurone layers. The reversibility of some of these inhibitory effects has been demonstrated, indicating that, up to a point, a generalized membrane destruction can be ruled out. The evidence, taken in conjunction with numerous examples from the literature showing calcium involvement in the action of all of the plant hormones, support a unifying theory of hormone action.

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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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