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Conversion of unstable compounds can contribute to the auxin pool during sample preparation

Gelinas-Marion, A, Nichols, DS ORCID: 0000-0002-8066-3132 and Ross, JJ 2020 , 'Conversion of unstable compounds can contribute to the auxin pool during sample preparation' , Plant Physiology, vol. 183, no. 4 , pp. 1432-1434 , doi: 10.1104/pp.20.00251.

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Auxin is a powerful regulator of plant growth and development (Heisler and Byrne, 2020). Accurate quantification of the main form of auxin, indole-3-acetic acid (IAA), is therefore essential for the study of auxin biology. Synthetic forms of the IAA-related compounds indole-3-pyruvic acid (IPyA) and indole-3-acetaldehyde (IAAld) have been shown to convert nonenzymatically to IAA, particularly in aqueous environments (Ernstsen et al., 1986; Tam and Normanly, 1998; Quittenden et al., 2009; Dai et al., 2013). These compounds are present in plants, and IPyA is now considered the main intermediate between tryptophan and IAA (Zhao, 2018). If substantial amounts of IPyA and/or IAAld convert to IAA during sample preparation, IAA quantification may be severely compromised. Here, a cysteamine-based derivatization method for converting IPyA and IAAld to stable forms (Novák et al., 2012) was used to demonstrate that endogenous IAA-related compounds can convert nonenzymatically to IAA during pea (Pisum sativum) and Arabidopsis (Arabidopsis thaliana) sample preparation. In derivatized samples, quantified IAA content was up to 40% lower than in underivatized controls. As a result, we recommend that harvested samples be derivatized soon after the completion of a short extraction period.

Item Type: Article
Authors/Creators:Gelinas-Marion, A and Nichols, DS and Ross, JJ
Keywords: plant hormone, auxin
Journal or Publication Title: Plant Physiology
Publisher: Amer Soc Plant Biologists
ISSN: 0032-0889
DOI / ID Number: 10.1104/pp.20.00251
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Copyright 2020 American Society of Plant Biologists

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