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Lipid profiling of the model temperate grass, Brachypodium distachyon

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Abstract

Lipids are essential metabolites in cells and they fulfil a variety of functions, including structural components of cellular membranes, energy storage, cell signalling, and membrane trafficking. In plants, changes in lipid composition have been observed in diverse responses ranging from abiotic and biotic stress to organogenesis. Knowledge of the lipid composition is an important first step towards understanding the function of lipids in any given biological system. As Brachypodium distachyon is emerging as the model species for temperate grass research, it is therefore fundamentally important to gain insights of its lipid composition. We used HPLC-coupled with tandem mass spectrometry to profile and quantify levels of sphingolipids and glycerophospholipids in shoots and undifferentiated cells in suspension cultures of B. distachyon. A total of 123 lipids belonging to 10 classes were identified and quantified. Our results showed that there are differences in lipid profiles and levels of individual lipid species between shoots and undifferentiated cells in suspension cultures. Additionally, we showed that 4-sphingenine (d18:1Δ4) is the main unsaturated dihydroxy-long chain base (LCB) in B. distachyon, and we were unable to detect d18:1Δ8, which is the main unsaturated dihydroxy-LCB in the model dicotyledonous species, Arabidopsis thaliana. This work serves as the first step towards a comprehensive characterization of the B. distachyon lipidome that will complement future biochemical studies.

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Acknowledgments

This work is supported by Science Foundation Ireland (SFI) Research Frontiers Programme and Equipment Grants (06/SFI/RFP/GEN034, 06/SFI/RFP/GEN034ES, 08/SFI/RFP/EOB1087) to C.K-Y.N. and an Irish Research Council for Science, Engineering, and Technology (IRCSET) Postgraduate Scholarship to J.P.C.

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  1. School of Biology and Environmental Science, University College Dublin, Belfield, Dublin 4, Ireland

    M. Nurul Islam, John P. Chambers & Carl K.-Y. Ng

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  1. M. Nurul Islam
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  2. John P. Chambers
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Correspondence to Carl K.-Y. Ng.

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Nurul Islam, M., Chambers, J.P. & Ng, C.KY. Lipid profiling of the model temperate grass, Brachypodium distachyon . Metabolomics 8, 598–613 (2012). https://doi.org/10.1007/s11306-011-0352-x

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