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. 1970 Jul;46(1):157–162. doi: 10.1104/pp.46.1.157

Effect of Ethylene on the Uptake, Distribution, and Metabolism of Indoleacetic Acid-1-14C and -2-14C and Naphthaleneacetic Acid-1-14C 1

Elmo M Beyer Jr a,2, Page W Morgan a
PMCID: PMC396551  PMID: 16657409

Abstract

The effect of ethylene on the uptake, distribution, and metabolism of indoleacetic acid (IAA)-1-14C, IAA-2-14C, and naphthaleneacetic acid (NAA)-1-14C in cotton stem sections (Gossypium hirsutum L., var. Stoneville 213) was studied. Stem sections excised from plants pretreated with ethylene for 15 hours transported significantly less 14C-IAA and 14C-NAA than control sections. Concomitant features of the reduction of 14C-IAA transport were an increase in decarboxylation and a trend toward a reduction in total uptake. With 14C-NAA, however, total uptake was significantly increased, and decarboxylation was unaffected.

14C-IAA was rapidly converted to indoleacetylaspartic acid and many other metabolites in both control and ethylene-pretreated stem sections. Following transport, similar amounts of 14C-IAA were recovered in the apical absorbing portion of the control and ethylene-pretreated sections. Significantly more 14C-IAA metabolites, however, were recovered in this region of the ethylene-pretreated sections.

Conversely, 14C-NAA was metabolized more slowly than 14C-IAA under identical experimental conditions, with the only major metabolite being naphthaleneacetylaspartic acid. Following transport the apical absorbing portion of ethylene-pretreated stem sections contained significantly more 14C-NAA than the controls. These results suggested that the disruption of auxin transport by ethylene cannot be explained in terms of a more rapid metabolism of auxin in the treated sections. The increased 14C-IAA metabolites in the absorbing portion of ethylene-pretreated sections appear to be the result, rather than the cause, of the ethylene-mediated disruption of IAA transport.

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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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