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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

✍ Scribed by M. L. Robert; H. F. Taylor; R. L. Wain

Publisher: Springer-Verlag
Year: 1976
Tongue: English
Weight: 416 KB
Volume: 129
Category: Article
ISSN: 0032-0935
DOI: 10.1007/bf00390913

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✦ Synopsis

In previous research here, 3,5-diiodo-4hydroxybenzoic acid (DIHB) was shown to promote the elongation of roots of cress (Lepidium sativum) seedlings growing in light, and to inhibit the auxininduced 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-t4C]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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