Genetica

, 139:871

Genotype × environment interaction is weaker in genitalia than in mating signals and body traits in Enchenopa treehoppers (Hemiptera: Membracidae)

Article

DOI: 10.1007/s10709-011-9591-z

Cite this article as:
Rodríguez, R.L. & Al-Wathiqui, N. Genetica (2011) 139: 871. doi:10.1007/s10709-011-9591-z

Abstract

Theory predicts that selection acting across environments should erode genetic variation in reaction norms; i.e., selection should weaken genotype × environment interaction (G × E). In spite of this expectation, G × E is often detected in fitness-related traits. It thus appears that G × E is at least sometimes sustained under selection, a possibility that highlights the need for theory that can account for variation in the presence and strength of G × E. We tested the hypothesis that trait differences in developmental architecture contribute to variation in the expression of G × E. Specifically, we assessed the influence of canalization (robustness to genetic or environmental perturbations) and condition-dependence (association between trait expression and prior resource acquisition or vital cellular processes). We compared G × E across three trait types expected to differ in canalization and condition-dependence: mating signals, body size-related traits, and genitalia. Because genitalia are expected to show the least condition-dependence and the most canalization, they should express weaker G × E than the other trait types. Our study species was a member of the Enchenopa binotata species complex of treehoppers. We found significant G × E in most traits; G × E was strongest in signals and body traits, and weakest in genitalia. These results support the hypothesis that trait differences in developmental architecture (canalization and condition-dependence) contribute to variation in the expression of G × E. We discuss implications for the dynamics of sexual selection on different trait types.

Keywords

Developmental plasticity Maintenance of genetic variation Phytophagous insect 

Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.Behavioral and Molecular Ecology Group, Department of Biological SciencesUniversity of Wisconsin-MilwaukeeMilwaukeeUSA
  2. 2.Biology DepartmentTufts UniversityMedfordUSA