Identification of defense compounds in Barbarea vulgaris against the herbivore Phyllotreta nemorum by an ecometabolomic approach.
Winter cress (Barbarea vulgaris) is resistant to a range of insect species. Some B. vulgaris genotypes are resistant, whereas others are susceptible, to herbivory by flea beetle larvae (Phyllotreta nemorum). Metabolites involved in resistance to herbivory by flea beetles were identified using an ecometabolomic approach. An F2 population representing the whole range from full susceptibility to full resistance to flea beetle larvae was generated by a cross between a susceptible and a resistant B. vulgaris plant. This F2 offspring was evaluated with a bioassay measuring the ability of susceptible flea beetle larvae to survive on each plant. Metabolites that correlated negatively with larvae survival were identified through correlation, cluster, and principal component analyses. Two main clusters of metabolites that correlate negatively with larvae survival were identified. Principal component analysis grouped resistant and susceptible plants as well as correlated metabolites. Known saponins, such as hederagenin cellobioside and oleanolic acid cellobioside, as well as two other saponins correlated significantly with plant resistance. This study shows the potential of metabolomics to identify bioactive compounds involved in plant defense.
Kuzina
Vera
V
Center for Molecular Plant Physiology, Department of Plant Biology and Biotechnology, Faculty of Life Sciences, University of Copenhagen, DK-1871 Frederiksberg C, Denmark.
Ekstrøm
Claus Thorn
CT
Andersen
Sven Bode
SB
Nielsen
Jens Kvist
JK
Olsen
Carl Erik
CE
Bak
Søren
S
D000818:Animals; D031216:Barbarea / Q000276:immunology* / Q000378:metabolism*; D002853:Chromatography, Liquid; D016000:Cluster Analysis; D001517:Coleoptera / Q000502:physiology*; D003433:Crosses, Genetic; D017753:Ecosystem; D005247:Feeding Behavior / Q000502:physiology*; D007814:Larva / Q000502:physiology; D013058:Mass Spectrometry; D055442:Metabolome; D055432:Metabolomics / Q000379:methods*; D009828:Oleanolic Acid / Q000031:analogs & derivatives / Q000032:analysis; D018515:Plant Leaves / Q000378:metabolism; D025341:Principal Component Analysis; D012503:Saponins / Q000378:metabolism; D016019:Survival Analysis
D012503:Saponins; D009828:Oleanolic Acid; C025763:hederagenin