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The effects of 3,5-diiodo-4-hydroxybenzoic acid on the oxidation of IAA and auxin-induced ethylene production by cress root segments

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Summary

In previous research here, 3,5-diiodo-4-hydroxybenzoic acid (DIHB) was shown to promote the elongation of roots of cress (Lepidium sativum) seedlings growing in light, and to inhibit the auxin-induced production of ethylene in this tissue. Although DIHB is a cofactor for the oxidation of indole-3-acetic acid (IAA) by horse-radish peroxidase, it inhibits the decarboxylation of [1-14C]IAA by segments excised from cress roots. The inhibition by DIHB of ethylene production by this tissue does not, therefore, arise from a reduction of IAA levels. These findings are discussed in relation to the effects of DIHB on cress root growth.

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Abbreviations

IAA:

indole-3-acetic acid

DIHB:

3,5-diiodo-4-hydroxybenzoic acid

DCP:

2,4-dichlorophenol

2,4-D:

2,4-dichlorophenoxyacetic acid

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This study forms part of a research project to be submitted by M.L.R. for PhD degree and supported by a grant from Consejo Nacional de Ciencia y Tecnología (México).

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Robert, M.L., Taylor, H.F. & Wain, R.L. The effects of 3,5-diiodo-4-hydroxybenzoic acid on the oxidation of IAA and auxin-induced ethylene production by cress root segments. Planta 129, 53–57 (1976). https://doi.org/10.1007/BF00390913

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  • DOI: https://doi.org/10.1007/BF00390913

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