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Method to quantify aluminum-induced organic acids secretion by roots of plants in nutrient solution using GC–MS

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Abstract

Organic acids (OAs) play an essential role in several cellular biochemical pathways. Released by plant roots, OAs can help them tolerate phytotoxic forms of aluminum (Al) present in acidic soils. Some studies use high-performance liquid chromatography (HPLC), ion chromatography and, more rarely, gas chromatography-mass spectrometry (GC–MS) to analyze exuded OAs, but they are limited to hours or 1–2 days. The main limitation is that OAs are measured only in CaCl2 and AlCl3 solutions, and not in “complete” nutrient solutions, only enabling short-term collection of secreted OAs. Here, we aimed to test a method to quantify citric, malic, oxalic and succinic acids in “complete” nutrient solution with 0, 740 and 1480 μM Al, using a GC–MS. First, a calibration curve was established through a chromatogram that was generated using six concentrations of OAs in methanol. Thus, samples containing OAs only were derived by methylation. Then, analytical curves were set up using seven OAs concentrations added in the three nutrient solutions. The OAs were concentrated by drying the solutions. After re-suspension, samples were derived by methylation. Instrumental precision and the method repeatability were also checked. Chromatograms showed adequate resolution, with distinct peak heights between OAs concentrations and their respective retention times. Both calibration and analytical curves indicated consistent linearity (R > 0.99), evidencing the method and equipment parameters were able to provide results directly proportional to OAs concentrations. This low-cost method is recommended for evaluation of Al-induced OA secretion by roots of whole plants in nutrient solutions for several days or weeks.

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Acknowledgements

BMOC Bittencourt acknowledges Grant #2016/14216-3, São Paulo Research Foundation (FAPESP) and Coordination for the Improvement of Higher Education Personnel (CAPES), for a Msc. scholarship. We acknowledge the Brazilian National Council for Scientific and Technological Development (CNPq) for financial support (474169/2013-8 Grant to GH) and for a productivity fellowship (309149/2017-7 Grant to GH).

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Authors and Affiliations

  1. Programa de Pós-Graduação Em Ciências Biológicas (Biologia Vegetal), Departamento de Botânica, Instituto de Biociências, Universidade Estadual Paulista, UNESP, Av. 24-A, 1515, Rio Claro, SP, 13506-900, Brazil

    Brenda Mistral de Oliveira Carvalho Bittencourt

  2. Centro de Estudos de Insetos Sociais (CEIS), Instituto de Biociências, Universidade Estadual Paulista, UNESP, Av. 24-A, 1515, Rio Claro, SP, 13506-900, Brazil

    Sebastião Zanão Filho

  3. Departamento de Botânica, Instituto de Biociências, Universidade Estadual Paulista, UNESP, Av. 24-A, 1515, Rio Claro, SP, 13506-900, Brazil

    Gustavo Habermann

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  1. Brenda Mistral de Oliveira Carvalho Bittencourt
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  2. Sebastião Zanão Filho
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  3. Gustavo Habermann
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Correspondence to Brenda Mistral de Oliveira Carvalho Bittencourt.

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de Oliveira Carvalho Bittencourt, B.M., Filho, S.Z. & Habermann, G. Method to quantify aluminum-induced organic acids secretion by roots of plants in nutrient solution using GC–MS. Theor. Exp. Plant Physiol. 32, 121–131 (2020). https://doi.org/10.1007/s40626-020-00171-0

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