Contribution of chromosomal polymorphisms to the G-matrix of Mimulus guttatus
Article first published online: 17 JUL 2009
© The Authors (2009). Journal compilation © New Phytologist (2009)
Special Issue: Plant adaptation - following in Darwin's footsteps
Volume 183, Issue 3, pages 803–815, August 2009
How to Cite
Scoville, A., Lee, Y. W., Willis, J. H. and Kelly, J. K. (2009), Contribution of chromosomal polymorphisms to the G-matrix of Mimulus guttatus. New Phytologist, 183: 803–815. doi: 10.1111/j.1469-8137.2009.02947.x
- Issue published online: 17 JUL 2009
- Article first published online: 17 JUL 2009
- Received: 4 February 2009Accepted: 28 May 2009
- genetic constraints;
- Mimulus guttatus;
- quantitative trait loci (QTLs)
- • Evolution of genetic (co)variances (the G-matrix) fundamentally influences multitrait divergence. Here, we isolated the contribution of two chromosomal quantitative trait loci (QTLs), a meiotic drive locus and a polymorphic inversion, to the overall G-matrix for a suite of floral, phenological and male fitness traits in a population of Mimulus guttatus. This allowed us to predict the evolution of trait means and genetic (co)variances as a function of allele frequencies, and to evaluate theories about the maintenance of genetic variation in fitness.
- • Individuals generated using a replicated F2 breeding design were grown under common conditions, genotyped and measured for trait values.
- • Significant additive genetic variance existed for all traits, and most genetic covariances were significantly nonzero. Both QTLs contribute to the additive genetic (co)variances of multiple traits. Pleiotropy was not generally consistent, either between QTLs or with the genetic background.
- • Shifts in allele frequencies at either QTL are predicted to result in substantial changes in the G-matrix. Both QTLs contribute substantially to the genetic variation in pollen viability. The Drive QTL, and perhaps also the inversion, demonstrates the contribution of balancing selection to the maintenance of genetic variation in fitness.