Genome-wide association to fine-scale ecological heterogeneity within a continuous population of Biscutella laevigata (Brassicaceae)
Article first published online: 17 JAN 2008
© The Authors (2008).
Volume 178, Issue 2, pages 436–447, April 2008
How to Cite
Parisod, C. and Christin, P.-A. (2008), Genome-wide association to fine-scale ecological heterogeneity within a continuous population of Biscutella laevigata (Brassicaceae). New Phytologist, 178: 436–447. doi: 10.1111/j.1469-8137.2007.02361.x
- Issue published online: 17 JAN 2008
- Article first published online: 17 JAN 2008
- Received: 19 September 2007Accepted: 29 November 2007
- amplified fragment length polymorphism (AFLP);
- between-group eigenanalysis;
- canonical correspondence analysis;
- landscape genomics;
- local adaptation;
- partial Mantel test;
- • Gene flow, drift and selection can be detected through different signatures across the genome and the landscape. Genetic discontinuities along with their correlation to environmental features can be used to tease out isolation-by-distance and isolation-by-time from processes related to selection.
- • Using spatial statistics (spatial autocorrelation methods, canonical correspondence analysis and partial Mantel tests) dealing with genome-wide amplified fragment length polymorphism (AFLP) under unlikely Hardy–Weinberg assumptions, this study investigates 124 individuals within a continuous population of the autopolyploid Biscutella laevigata (Brassicaceae).
- • Fine-scale spatial genetic structure was strong and the mosaic-like distribution of AFLP genotypes was consistently associated with habitat factors, even when controlled for geographical distances. The use of multivariate analyses enabled separation of the factors responsible for the repartition of the genetic variance and revealed a composite effect of isolation by distance, phenological divergence and local adaptation to habitats characterised by different solar radiation regimes.
- • These results suggest that the immigrant inviability barrier facilitated the maintenance of adapted subpopulations to distinct environmental conditions at the local scale.