Phylogenetic analysis of floral integration in Schizanthus (Solanaceae): does pollination truly integrate corolla traits?
Article first published online: 23 JUL 2007
Journal of Evolutionary Biology
Volume 20, Issue 5, pages 1730–1738, September 2007
How to Cite
PÉREZ, F., ARROYO, M. T. K. and MEDEL, R. (2007), Phylogenetic analysis of floral integration in Schizanthus (Solanaceae): does pollination truly integrate corolla traits?. Journal of Evolutionary Biology, 20: 1730–1738. doi: 10.1111/j.1420-9101.2007.01393.x
- Issue published online: 23 JUL 2007
- Article first published online: 23 JUL 2007
- Received 31 March 2007; accepted 23 May 2007
- autonomous selfing;
- comparative studies;
- correlational selection;
- evolutionary constraints;
- phenotypic correlations;
To assess whether floral integration patterns result from the action of pollinator selection on functionally related traits, we compared corolla integration patterns in eight Schizanthus species differing in pollination systems and in their degree of pollinator dependence across a molecular phylogeny. Integration patterns differed among species and these differences were not related to their phylogenetic relatedness. When the putative original function of some corolla traits was lost in pollinator-dependent species, the integration among nonfunctional characters and the rest of the corolla traits was disrupted. This pattern was not presented in species adapted for late autonomous selfing, which exhibited higher corolla integration than their pollinator-dependent relatives. These results suggest that corolla integration in pollinator-dependent species was shaped by pollinator-mediated selection. Decoupling of nonfunctional traits in these species may result from a relaxation of correlational selection or from selection acting against a default covariation provided by genetic and developmental connections.