Multiple Nuclear Gene Phylogenetic Analysis of the Evolution of Dioecy and Sex Chromosomes in the Genus Silene

0301 basic medicine [SDV.OT]Life Sciences [q-bio]/Other [q-bio.OT] Time Factors Science Genes, Plant Chromosomes, Plant Evolution, Molecular /dk/atira/pure/subjectarea/asjc/1300 03 medical and health sciences Species Specificity /dk/atira/pure/subjectarea/asjc/1100 Silene Phylogeny Medicine(all) Cell Nucleus Sex Chromosomes Agricultural and Biological Sciences(all) Biochemistry, Genetics and Molecular Biology(all) [SDV.OT] Life Sciences [q-bio]/Other [q-bio.OT] Q R Genetic Variation Bayes Theorem 15. Life on land Medicine /dk/atira/pure/subjectarea/asjc/2700 Research Article
DOI: 10.1371/journal.pone.0021915 Publication Date: 2011-08-10T20:45:35Z
ABSTRACT
In the plant genus Silene, separate sexes and sex chromosomes are believed to have evolved twice. Silene species that are wholly or largely hermaphroditic are assumed to represent the ancestral state from which dioecy evolved. This assumption is important for choice of outgroup species for inferring the genetic and chromosomal changes involved in the evolution of dioecy, but is mainly based on data from a single locus (ITS). To establish the order of events more clearly, and inform outgroup choice, we therefore carried out (i) multi-nuclear-gene phylogenetic analyses of 14 Silene species (including 7 hermaphrodite or gynodioecious species), representing species from both Silene clades with dioecious members, plus a more distantly related outgroup, and (ii) a BayesTraits character analysis of the evolution of dioecy. We confirm two origins of dioecy within this genus in agreement with recent work on comparing sex chromosomes from both clades with dioecious species. We conclude that sex chromosomes evolved after the origin of Silene and within a clade that includes only S. latifolia and its closest relatives. We estimate that sex chromosomes emerged soon after the split with the ancestor of S. viscosa, the probable closest non-dioecious S. latifolia relative among the species included in our study.
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