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. 2017 May 31;8:882. doi: 10.3389/fpls.2017.00882

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Copyright © 2017 Schaker, Peters, Cataldi, Labate, Caldana and Monteiro-Vitorello.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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LC-ESI-MS metabolomics analysis in sugarcane-smut interaction. Four-way Venn diagram representing differentially accumulated (FDR ≤ 0.05) non-redundant m/z of each time point analyzed among infected and control plants of the same age using (A) positive and (B) negative ionizations. (C) Heatmap shows the dynamics of these metabolites during the progression of sugarcane smut disease. It was obtained with gplots (Warnes et al., 2013) for R (R Core Team, 2015) with Log2 Fold Change (inoculated/control) values of shared differentially accumulated m/z from Venn diagrams. “P”: Positive ionization, “N”: negative ionization. (D) Top 10 m/z based on VIP scores from PLS-DA for each time point analyzed in positive and negative ionization. These m/z were submitted to LC-ESI-MS/MS analysis to confirm their identity. The x-axis shows the correlation scores and y-axis corresponds to LC-ESI-MS m/z. Distribution of each m/z in inoculated plants compared to controls is represented as colored squares. Red squares represent those exclusively identified in inoculated samples, green squares represent m/z identified exclusively identified in control samples.