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Auxin regulation of gibberellin biosynthesis in the roots of pea (Pisum sativum)

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Weston, DE and Reid, JB and Ross, JJ (2009) Auxin regulation of gibberellin biosynthesis in the roots of pea (Pisum sativum). Functional Plant Biology, 36. pp. 362-369. ISSN 1445-4408

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Abstract

Auxin promotes GA biosynthesis in the aboveground parts of plants. However, it has not been demonstrated previously that this interaction occurs in roots. To understand the interactions between auxin and GAs in these organs, we treated wild-type pea (Pisum sativum L.) roots with the inhibitors of auxin action, p-chlorophenoxyisobutyric acid (PCIB) and yokonolide B (YkB), and with the auxin transport inhibitor N-1-naphthylphthalamic acid (NPA). These compounds generally downregulatedGAsynthesis genes and upregulated GAdeactivation genes, and reduced the level of the bioactive GA1. These effects indicate that in pea roots, auxin at normal endogenous levels stimulates GA biosynthesis. We show also that supra-optimal levels of exogenous auxin reduce the endogenous level of bioactive GA in roots, although the effect appears too small to account for the strong growth-inhibitory effect of high auxin levels.

Item Type: Article
Keywords: auxin gibberellin pea roots hormones
Journal or Publication Title: Functional Plant Biology
Page Range: pp. 362-369
ISSN: 1445-4408
Identification Number - DOI: 10.1071/FP08301
Date Deposited: 15 Jun 2011 06:36
Last Modified: 18 Nov 2014 04:18
URI: http://eprints.utas.edu.au/id/eprint/11056
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