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. 1975 Jun;55(6):1082–1086. doi: 10.1104/pp.55.6.1082

Auxin and the Response of Pea Roots to Auxin Transport Inhibitors: Morphactin

Douglas H Gaither a,1
PMCID: PMC541771  PMID: 16659215

Abstract

The auxin transport inhibitor methyl-2-chloro-9-hydroxyfluorene-9-carboxylate (CFM), a morphactin, inhibits negative geotropism, causes cellular swelling, and induces root hair formation in roots of intact Pisum sativum L. seedlings. In excised pea root tips, CFM inhibits elongation more than increase in fresh weight (swell ratio = 1.3 at 20 μm CFM). CFM growth inhibition was expressed in the presence of ethylene. Indoleacetic acid (IAA) prevented the expression of CFM growth inhibition possibly because IAA inhibited the accumulation of CFM into the tissue sections. CFM inhibited the accumulation of IAA and 2,4-dichlorophenoxyacetic acid into excised root tips. Applying Leopold's (1963. Brookhaven Symp. Biol. 16: 218-234) model for polar auxin transport, this result suggests a possible explanation for CFM inhibition of geotropism in pea roots, i.e. disruption of auxin transport by interfering with auxin binding.

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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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