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ACS Central Science

ACS Central Science

IF: 12.7
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Multiple facets of Arabidopsis seedling development require indole-3-butyric acid-derived auxin.

Published:1 March 2011 DOI: 10.1105/tpc.111.083071 PMID: 21406624
Lucia C Strader, Dorthea L Wheeler, Sarah E Christensen, John C Berens, Jerry D Cohen, Rebekah A Rampey, Bonnie Bartel

Abstract

Levels of auxin, which regulates both cell division and cell elongation in plant development, are controlled by synthesis, inactivation, transport, and the use of storage forms. However, the specific contributions of various inputs to the active auxin pool are not well understood. One auxin precursor is indole-3-butyric acid (IBA), which undergoes peroxisomal β-oxidation to release free indole-3-acetic acid (IAA). We identified ENOYL-COA HYDRATASE2 (ECH2) as an enzyme required for IBA response. Combining the ech2 mutant with previously identified iba response mutants resulted in enhanced IBA resistance, diverse auxin-related developmental defects, decreased auxin-responsive reporter activity in both untreated and auxin-treated seedlings, and decreased free IAA levels. The decreased auxin levels and responsiveness, along with the associated developmental defects, uncover previously unappreciated roles for IBA-derived IAA during seedling development, establish IBA as an important auxin precursor, and suggest that IBA-to-IAA conversion contributes to the positive feedback that maintains root auxin levels.

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Procduct Name CAS Molecular Formula Supplier Price
Indole-3-acetic acid 87-51-4 C10H9NO2 935 suppliers $10.16-$1339.52
Indole-3-butyric acid 133-32-4 C12H13NO2 904 suppliers $10.00-$1000.00
Indole-3-acetic acid sodium salt 6505-45-9 C10H10NNaO2 199 suppliers $12.00-$775.00

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