title: S-RNase-mediated gametophytic self-incompatibility is ancestral in eudicots.
abstract: The evolutionary relationship between self-incompatibility systems in different families of flowering plants has long been a topic of interest. Physiological differences in the mode of gene action and the enormous sequence differences between genes with different modes of action suggest that many instances of self-incompatibility have arisen independently. In contrast, previous analyses of the S-RNase associated with gametophytic self-incompatibility in the eudicot families (Solanaceae, Scrophulariaceae, and Rosaceae) have suggested that sequences within families form well-supported and distinct lineages. In this study we demonstrate that in fact, S-RNase-mediated gametophytic self-incompatibility evolved only once in the eudicots.
authors.affiliation: The Field Museum, Department of Zoology, Chicago. jen@compbiology.org
authors.forename: J E
authors.initials: JE
authors.lastname: Steinbachs
authors.forename: K E
authors.initials: KE
authors.lastname: Holsinger
mesh_terms: D019684:Magnoliopsida / Q000235:genetics* / Q000378:metabolism; D010802:Phylogeny; D012098:Reproduction / Q000235:genetics / Q000502:physiology; D012260:Ribonucleases / Q000235:genetics* / Q000378:metabolism; D016415:Sequence Alignment; D020539:Sequence Analysis, Protein
chemical_list: D012260:Ribonucleases