Journal of Chemical Ecology

, Volume 32, Issue 11, pp 2417–2428 | Cite as

Metabolomic Differentiation of Brassica rapa Following Herbivory by Different Insect Instars using Two-Dimensional Nuclear Magnetic Resonance Spectroscopy

  • Heru Tri Widarto
  • Ed Van Der Meijden
  • Alfons W. M. Lefeber
  • Cornelis Erkelens
  • Hye Kyong Kim
  • Young Hae Choi
  • Robert Verpoorte
Article

Abstract

The metabolic alterations of Brassica rapa (L.) leaves attacked by larvae of the specialist Plutella xylostella L. (Lepidoptera: Yponomeutidae) and the generalist Spodoptera exigua Hubner (Lepidoptera: Noctuidae) were investigated with nuclear magnetic resonance (NMR) spectroscopy, followed by a multivariate data analysis. The principal component analysis (PCA) of 1H NMR spectra showed that metabolic changes in B. rapa leaves induced by the 2nd and the 4th instars were different from each other. However, the congestion of the one-dimensional 1H NMR spectrum made it difficult to identify discriminating metabolites. To overcome the spectral complexity, several two-dimensional NMR techniques were applied. Of those evaluated, J-resolved spectroscopy, which affords an additional coupling constant, provided a wide range of structure information on differentiating the metabolites. Based on the J-resolved spectra combined with PCA, the major signals contributing to the discrimination were alanine, threonine, glucose, sucrose, feruloyl malate, sinapoyl malate, and gluconapin.

Keywords

Herbivory Brassica rapa Plutella xylostella Spodoptera exigua Metabolic profiling Two-dimensional nuclear magnetic resonance spectroscopy Principal component analysis 

Notes

Acknowledgment

Financial support from the Netherlands Education Centre (STUNED Scholarship 2003) for Heru Tri Widarto is highly acknowledged. We also acknowledge Henk Nell for rearing S. exigua larvae.

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Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • Heru Tri Widarto
    • 1
    • 2
  • Ed Van Der Meijden
    • 3
  • Alfons W. M. Lefeber
    • 4
  • Cornelis Erkelens
    • 4
  • Hye Kyong Kim
    • 1
  • Young Hae Choi
    • 1
  • Robert Verpoorte
    • 1
  1. 1.Division of Pharmacognosy, Section Metabolomics, Institute of BiologyLeiden UniversityLeidenThe Netherlands
  2. 2.Crop Protection Development Center, Directorate General of Crop EstateMinistry of Agriculture, Republic of IndonesiaSumatera UtaraIndonesia
  3. 3.Section Plant Ecology, Institute of BiologyLeiden UniversityLeidenThe Netherlands
  4. 4.Division of NMR, Institute of ChemistryGorlaeus LaboratoriesLeidenThe Netherlands

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