Endophyte-mediated resistance to herbivores depends on herbivore identity in the wild grass festuca subverticillata

Michelle Afkhami, Jennifer A. Rudgers

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Understanding factors that affect the context dependency of species interactions has been identified as a critical research area in ecology. The presence of symbionts in host plants can be an important factor influencing the outcome of plant-insect interactions. Similarly, herbivore identity can alter the outcome of plant-symbiont interactions. Symbiotic foliar fungal endophytes confer resistance to herbivores in economically important agronomic grasses, in part through the production of alkaloids. Although endophytes are common in nature, relatively little is known about their effects on herbivores of native, wild grass species, and a recent meta-analysis suggested that endophytes are only beneficial in agronomic settings. In this study, we performed choice trials for five insect species and a greenhouse experiment with one species to assess effects of the fungal endophyte Neotyphodium sp. on herbivores of the wild grass Festuca subverticillata. In feeding trials, endophyte presence altered the preference of all five insect species tested. However, the magnitude and direction of preference varied among species, with Pterophylla camellifolia (F.), Spodoptera frugiperda (J. E. Smith), and Rhopalosiphum padi L. preferring endophyte-disinfected plants and Entopto1ophas costalis (Scudder) and Romalea guttata (Houttuyn) preferring endophyte-symbiotic plants. Despite reducing insect preference, the endophyte had no significant effect on S. frugiperda performance in a no-choice greenhouse experiment and did not increase plant growth in response to this herbivore. Our results show that endophyte-mediated resistance to herbivory depends strongly on herbivore identity and suggest that the fitness consequences of endophyte symbiosis for host plants will be context dependent on the local composition of insect herbivores.

Original languageEnglish (US)
Pages (from-to)1086-1095
Number of pages10
JournalEnvironmental Entomology
Volume38
Issue number4
DOIs
StatePublished - Aug 1 2009
Externally publishedYes

Fingerprint

endophyte
endophytes
herbivore
herbivores
grass
grasses
insect
insects
Spodoptera frugiperda
symbiont
greenhouse experimentation
symbionts
host plant
Romalea guttata
host plants
Festuca subverticillata
plant-insect interaction
Neotyphodium
plant-insect relations
Rhopalosiphum padi

Keywords

  • Context-dependent interactions
  • Epichloe
  • Food choice
  • Neotyphodiu;n
  • Spodoptera frugiperda

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Insect Science

Cite this

Endophyte-mediated resistance to herbivores depends on herbivore identity in the wild grass festuca subverticillata. / Afkhami, Michelle; Rudgers, Jennifer A.

In: Environmental Entomology, Vol. 38, No. 4, 01.08.2009, p. 1086-1095.

Research output: Contribution to journalArticle

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