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A conserved pattern in plant-mediated interactions between herbivores.

Jing Lu1, Christelle A M Robert2, Yonggen Lou3

  • 1Root Herbivore Interactions Group Department of Biochemistry Max Planck Institute for Chemical Ecology Hans-Knöll-Str. 2107745 Jena Germany; Institute of Insect Sciences Zhejiang University Zijingang Campus, Yuhangtang Road 866 Hangzhou 310058 China.

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Summary

Plant-mediated interactions between herbivores in maize generally lead to negative responses from root feeders when leaf feeders are present. This stability suggests potential for evolutionary adaptations in agroecosystems.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Agricultural Science

Background:

  • Plant-mediated interactions between herbivores shape ecological communities and plant performance.
  • Previous research indicated herbivore and plant identity determine interaction outcomes, potentially leading to stochastic patterns.
  • Limited studies have systematically explored specificity versus general patterns by varying all interacting components.

Purpose of the Study:

  • To investigate how herbivore identity and maize genotype influence interactions between leaf-chewing and root-feeding herbivores.
  • To assess the specificity and generality of plant-mediated interactions within a maize system.

Main Methods:

  • Utilized a partial factorial design in maize.
  • Exposed nine maize genotypes to oral secretions from six different leaf-chewing herbivores.
  • Monitored the behavioral responses of three different root feeders to these induced plant states.

Main Results:

  • A conserved pattern emerged: most leaf herbivores induced negative behavioral responses in root feeders across most maize genotypes.
  • No instances of facilitation between leaf and root herbivores were observed.
  • Specific exceptions noted: one leaf feeder's secretions and two maize genotypes did not elicit a response from root feeders.

Conclusions:

  • Plant-mediated interactions between herbivores in this maize system predominantly follow a general pattern with some degree of specificity.
  • The observed stability in plant-mediated interactions suggests potential for evolutionary adaptations.
  • These interactions may play a more significant role in terrestrial agroecosystem evolutionary dynamics than previously recognized.