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Journal of Chemical Ecology

, Volume 46, Issue 1, pp 76–83 | Cite as

Asymmetry in Herbivore Effector Responses: Caterpillar Frass Effectors Reduce Performance of a Subsequent Herbivore

  • Swayamjit Ray
  • Anjel M. Helms
  • Nina L. Matulis
  • Elizabeth Davidson-Lowe
  • William Grisales
  • Jared G. AliEmail author
Article

Abstract

Multiple species of phytophagous insects may co-occur on a plant and while plants can defend themselves from insect herbivory, plant responses to damage by different species and feeding guilds of insects may be asymmetric. Plants can trigger specific responses to elicitors/effectors in insect secretions altering herbivore performance. Recently, maize chitinases present in fall armyworm (FAW, Spodoptera frugiperda) frass were shown to act as effectors suppressing caterpillar-induced defenses in maize while increasing caterpillar performance. We investigated the effect of frass chitinase-mediated suppression of herbivore defenses in maize on the performance and preference of a subsequent insect herbivore from a different feeding guild, corn leaf aphid (Rhopalosiphum maidis). Aphid performance was highest on plants with FAW damage without frass chitinases compared to damaged plants with frass chitinases or undamaged plants. Plant exposure to frass chitinases post FAW damage also altered the production of herbivore-induced volatile compounds compared to damaged, buffer-treated plants. However, aphid preference to damaged, frass chitinase-treated plants was not different from damaged, buffer-treated plants or undamaged plants. This study suggests that frass effector-mediated alteration of plant defenses affects insect herbivores asymmetrically; while it enhances the performance of caterpillars, it suppresses the performance of subsequent herbivores from a different feeding guild.

Keywords

Frass Effector Chitinase Fall armyworm Corn leaf aphid Herbivore-induced plant volatiles Induced defenses Maize 

Notes

Author Contributions

SR, AMH and JGA conceptualized the study, performed the analyses and SR wrote the manuscript with AMH and JGA. SR performed the experiments with the help of AMH, NML, EDL and WG.

Funding Information

The authors would like to thank College of Agricultural Sciences at The Pennsylvania State University for the Rider Research award and USDA-NIFA-GRANT12438289 to JGA for the financial support to conduct this study.

Supplementary material

10886_2019_1131_MOESM1_ESM.docx (30 kb)
ESM 1 (DOCX 30 kb)
10886_2019_1131_MOESM2_ESM.pdf (882 kb)
ESM 2 (PDF 882 kb)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of EntomologyThe Pennsylvania State UniversityUniversity ParkUSA
  2. 2.Department of EntomologyTexas A&M UniversityCollege StationUSA

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