Genetic architecture and adaptive significance of the selfing syndrome in capsella

Tanja Slotte, Khaled M. Hazzouri, David Stern, Peter Andolfatto, Stephen I. Wright

Research output: Contribution to journalArticle

55 Scopus citations

Abstract

The transition from outcrossing to predominant self-fertilization is one of the most common evolutionary transitions in flowering plants. This shift is often accompanied by a suite of changes in floral and reproductive characters termed the selfing syndrome. Here, we characterize the genetic architecture and evolutionary forces underlying evolution of the selfing syndrome in Capsella rubella following its recent divergence from the outcrossing ancestor C. grandiflora. We conduct genotyping by multiplexed shotgun sequencing and map floral and reproductive traits in a large (N= 550) F2 population. Our results suggest that in contrast to previous studies of the selfing syndrome, changes at a few loci, some with major effects, have shaped the evolution of the selfing syndrome in Capsella. The directionality of QTL effects, as well as population genetic patterns of polymorphism and divergence at 318 loci, is consistent with a history of directional selection on the selfing syndrome. Our study is an important step toward characterizing the genetic basis and evolutionary forces underlying the evolution of the selfing syndrome in a genetically accessible model system.

Original languageEnglish (US)
Pages (from-to)1360-1374
Number of pages15
JournalEvolution
Volume66
Issue number5
DOIs
StatePublished - May 2012

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Genetics
  • Agricultural and Biological Sciences(all)

Keywords

  • Floral evolution
  • Mating system shift
  • Next-generation sequencing
  • Population genetics
  • Quantitative trait locus mapping

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