Metabolomics

, Volume 8, Issue 4, pp 598–613

Lipid profiling of the model temperate grass, Brachypodium distachyon

  • M. Nurul Islam
  • John P. Chambers
  • Carl K.-Y. Ng
Original Article

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.

Keywords

Brachypodium distachyon Lipidome Glycerophospholipids Sphingolipids LC–MS/MS 

Supplementary material

11306_2011_352_MOESM1_ESM.doc (50 kb)
Supplementary material 1 (DOC 50 kb)

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • M. Nurul Islam
    • 1
  • John P. Chambers
    • 1
  • Carl K.-Y. Ng
    • 1
  1. 1.School of Biology and Environmental ScienceUniversity College DublinDublin 4Ireland

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