title: Haldane's rule is extended to plants with sex chromosomes.
abstract: Haldane's rule is an empirical phenomenon that has been observed in animals with sex chromosomes. The rule states that the heterogametic sex (XY or ZW) will be “absent, rare, or sterile” following hybridization between two species. Despite the near ubiquity of Haldane's rule in animal hybridizations, it has not been documented in organisms other than animals. Here, we show evidence for both rarity and sterility in hybrid male but not female offspring in crosses between three dioecious plant species from the genus Silene with heteromorphic (XY) sex chromosomes. Our results are consistent with Haldane's rule, extending its applicability to plants with sex chromosomes.
authors.affiliation: Department of Biology, 1001 East Third Street, Indiana University, Bloomington, Indiana 47405, USA.
authors.forename: Amanda N
authors.initials: AN
authors.lastname: Brothers
authors.forename: Lynda F
authors.initials: LF
authors.lastname: Delph
mesh_terms: D005075:Biological Evolution; D018745:Genome, Plant; D006824:Hybridization, Genetic; D029751:Silene / Q000235:genetics* / Q000502:physiology