Medicago truncatula Oleanolic-Derived Saponins Are Correlated with Caterpillar Deterrence View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2017-07-25

AUTHORS

Fanping Cai, Bonnie S. Watson, David Meek, David V. Huhman, Daniel J. Wherritt, Cecile Ben, Laurent Gentzbittel, Brian T. Driscoll, Lloyd W. Sumner, Jacqueline C. Bede

ABSTRACT

Plant resistance mechanisms to insect herbivory can potentially be bred into crops as an important strategy for integrated pest management. Medicago truncatula ecotypes inoculated with the rhizobium Ensifer medicae (Sinorhizobium medica) WSM419 were screened for resistance to herbivory by caterpillars of the beet armyworm, Spodoptera exigua, through leaf and whole plant choice studies; TN1.11 and F83005.5 are identified as the least and most deterrent ecotypes, respectively. In response to caterpillar herbivory, both ecotypes mount a robust burst of plant defensive jasmonate phytohormones. Restriction of caterpillars to either of these ecotypes does not adversely affect pest performance. This argues for an antixenosis (deterrence) resistance mechanism associated with the F83005.5 ecotype. Unbiased metabolomic profiling identified strong ecotype-specific differences in metabolite profile, particularly in the content of oleanolic-derived saponins that may act as antifeedants. Compared to the more susceptible ecotype, F83005.5 has higher levels of oleanolic-type zanhic acid- and medicagenic acid-derived compounds. Together, these data support saponin-mediated deterrence as a resistance mechanism of the F83005.5 ecotype and implicates these compounds as potential antifeedants that could be used in agricultural sustainable pest management strategies. More... »

PAGES

712-724

References to SciGraph publications

  • 2003-02. Herbivore-Induced Responses in Alfalfa (Medicago sativa) in JOURNAL OF CHEMICAL ECOLOGY
  • 2014-09-27. Jasmonate-dependent induction of polyphenol oxidase activity in tomato foliage is important for defense against Spodoptera exigua but not against Manduca sexta in BMC PLANT BIOLOGY
  • 2013-09-25. Crop pests: Under attack in NATURE
  • 2014-04-27. An improved genome release (version Mt4.0) for the model legume Medicago truncatula in BMC GENOMICS
  • 2014-03-26. Oxidative injury and antioxidant genes regulation in cadmium-exposed radicles of six contrasted Medicago truncatula genotypes in ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
  • 2008-08-14. The use of neutral and non-neutral SSRs to analyse the genetic structure of a Tunisian collection of Medicago truncatula lines and to reveal associations with eco-environmental variables in GENETICA
  • 1997-04. Alfalfa Leaf Saponins and Insect Resistance in JOURNAL OF CHEMICAL ECOLOGY
  • 2007-07-04. Deterrence and Toxicity of Plant Saponins for the Pea Aphid Acyrthosiphon Pisum Harris in JOURNAL OF CHEMICAL ECOLOGY
  • 2013-08-29. Saponins and their role in biological processes in plants in PHYTOCHEMISTRY REVIEWS
  • 1996. Saponins from Medicago SPP.: Chemical Characterization and Biological Activity Against Insects in SAPONINS USED IN FOOD AND AGRICULTURE
  • 2010-05-06. Quantitative analysis of major plant hormones in crude plant extracts by high-performance liquid chromatography–mass spectrometry in NATURE PROTOCOLS
  • 2012-07-02. High toxicity and specificity of the saponin 3-GlcA-28-AraRhaxyl-medicagenate, from Medicago truncatula seeds, for Sitophilus oryzae in BMC MOLECULAR AND CELL BIOLOGY
  • 2000-04. Effects of Alfalfa Saponins on the Moth Spodoptera littoralis in JOURNAL OF CHEMICAL ECOLOGY
  • 2010-06-25. Saponins as cytotoxic agents: a review in PHYTOCHEMISTRY REVIEWS
  • 2016-04-07. Cadmium-induced changes in antioxidative systems and differentiation in roots of contrasted Medicago truncatula lines in PROTOPLASMA
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s10886-017-0863-7

    DOI

    http://dx.doi.org/10.1007/s10886-017-0863-7

    DIMENSIONS

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    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/28744732


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    29 schema:description Plant resistance mechanisms to insect herbivory can potentially be bred into crops as an important strategy for integrated pest management. Medicago truncatula ecotypes inoculated with the rhizobium Ensifer medicae (Sinorhizobium medica) WSM419 were screened for resistance to herbivory by caterpillars of the beet armyworm, Spodoptera exigua, through leaf and whole plant choice studies; TN1.11 and F83005.5 are identified as the least and most deterrent ecotypes, respectively. In response to caterpillar herbivory, both ecotypes mount a robust burst of plant defensive jasmonate phytohormones. Restriction of caterpillars to either of these ecotypes does not adversely affect pest performance. This argues for an antixenosis (deterrence) resistance mechanism associated with the F83005.5 ecotype. Unbiased metabolomic profiling identified strong ecotype-specific differences in metabolite profile, particularly in the content of oleanolic-derived saponins that may act as antifeedants. Compared to the more susceptible ecotype, F83005.5 has higher levels of oleanolic-type zanhic acid- and medicagenic acid-derived compounds. Together, these data support saponin-mediated deterrence as a resistance mechanism of the F83005.5 ecotype and implicates these compounds as potential antifeedants that could be used in agricultural sustainable pest management strategies.
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