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SELECTION FOR HOST MODIFICATION BY INSECT PARASITOIDS.

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GENETICS OF RESISTANCE OF SALIX SERICEA TO A DIVERSE COMMUNITY OF HERBIVORES.

Bernadette M Roche1, Robert S Fritz1

  • 1Department of Biology, Vassar College, Poughkeepsie, New York, 12604.

Evolution; International Journal of Organic Evolution
|June 2, 2017
PubMed
Summary

Silky willow (Salix sericea) shows potential for evolved resistance to two specific herbivores. However, multispecies coevolution among its diverse herbivore community appears unlikely due to weak genetic correlations.

Keywords:
Heritability of resistanceSalix sericeahost-plant resistancemultispecies selection

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Plant-Insect Interactions

Background:

  • Understanding plant resistance to herbivores is crucial for predicting community dynamics.
  • Multispecies coevolutionary processes can shape plant and herbivore traits.
  • Genetic correlations between herbivore resistances can indicate potential for coevolution.

Purpose of the Study:

  • To measure the resistance of Salix sericea to a diverse assemblage of 12 herbivores.
  • To investigate the potential for multispecies coevolution among these herbivores.
  • To determine genetic correlations between pairs of herbivores interacting with S. sericea.

Main Methods:

  • Herbivore attack was measured on half-sib families of potted Salix sericea over three years.
  • Narrow-sense heritabilities of resistance to specific herbivores were calculated.
  • Phenotypic and genetic correlations between herbivore abundances were analyzed.

Main Results:

  • Significant narrow-sense heritabilities of resistance were found for Phyllonorycter salicifoliella and Phyllocnistis sp. in 1991.
  • Most genetic correlations between herbivore abundances within a year were not significant.
  • The structure of genetic and phenotypic correlations varied annually throughout the three-year study.

Conclusions:

  • Salix sericea exhibits potential for evolved resistance to Phyllonorycter salicifoliella and Phyllocnistis sp.
  • The lack of significant genetic correlations suggests multispecies coevolution among the studied herbivores is unlikely.
  • Year-to-year variation in correlation structure highlights the complexity of plant-herbivore interactions.