Abstract
Mass spectrometry imaging was applied on germinated barley for the detailed localization of metabolites in longitudinal and transversal seed sections. Among others, 20 m/z signals occurred in three regular peak clusters with specific, distinct localizations in embryo tissues. High resolution FT-ICR MS, MALDI-TOF MS/MS, and UHPLC-ESI MS/MS served for the identification and structural characterization of these compounds. Only five metabolites were published in their structures, namely the antifungal compounds hordatine A and B in non-glycosylated and glycosylated forms. All other non-identified cluster compounds were of hordatine-like structure and differed by systematic O-methylations, hydroxylations, and glycosylations. These differences in molecular structures correlated to distinct localization patterns within the embryo and might serve for the regulation of antifungal properties. Based on the structural investigations by mass spectrometry, an array of different hordatines that comprises the five published hordatines, 15 novel hordatine derivates and their six precursors could be localized in the embryo of germinated barley. Implications for the biosynthetic pathway and transport processes are discussed.
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Abbreviations
- a.u.:
-
Arbitrary unit
- ACT:
-
Agmatine coumaroyltransferase
- CID:
-
Collision induced dissociation
- cv.:
-
Cultivar
- Da:
-
Dalton
- DHB:
-
2,5-Dihydroxybenzoate
- ESI:
-
Electrospray ionization
- FT-ICR:
-
Fourier transform-ion cyclotron resonance
- GC:
-
Gas chromatography
- HCAA:
-
Hydroxycinnamic acid amide
- ITO:
-
Indium tin oxide
- LC:
-
Liquid chromatography
- m/z :
-
Mass to charge ratio
- MALDI:
-
Matrix-assisted laser desorption/ionization
- MS:
-
Mass spectrometry
- MSI:
-
Mass spectrometry imaging
- NMR:
-
Nuclear magnetic resonance
- Q-TOF:
-
Quadrupole-time of flight
- TIC:
-
Total ion count
- UHPLC:
-
Ultra high-performance liquid chromatography
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Acknowledgments
The authors highly acknowledge the support by Bruker Daltonics GmbH, who offered MALDI-FT-ICR MS imaging technology. Namely, we would like to thank Michael Becker and Jens Fuchser (Bruker Daltonics) for their helpful advice in data analyses. The authors further acknowledge the support of DFG grant “Mass Spectrometry Imaging”. Karin Gorzolka was supported by the CLIB2021 graduate cluster and by a scholarship of Bielefeld University.
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Gorzolka, K., Bednarz, H. & Niehaus, K. Detection and localization of novel hordatine-like compounds and glycosylated derivates of hordatines by imaging mass spectrometry of barley seeds. Planta 239, 1321–1335 (2014). https://doi.org/10.1007/s00425-014-2061-y
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DOI: https://doi.org/10.1007/s00425-014-2061-y