S-RNase-mediated gametophytic self-incompatibility is ancestral in eudicots.
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.
Steinbachs
J E
JE
The Field Museum, Department of Zoology, Chicago. jen@compbiology.org
Holsinger
K E
KE
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
D012260:Ribonucleases