title: Different positively selected sites at the gametophytic self-incompatibility pistil S-RNase gene in the Solanaceae and Rosaceae (Prunus, Pyrus, and Malus).
abstract: In this work we perform a comparative study on the location of positively selected sites (those likely responsible for defining specificity differences) at the S-RNase gene, the pistil component of the gametophytic self-incompatibility system. For Plantaginaceae and Rosaceae (Prunus and Pyrus/Malus) this is the first study of this kind. A clear sign of positive selection was observed for 13, 17, and 27 amino acid sites in Solanaceae, Prunus, and Pyrus/Malus, respectively, using two different methodologies. In Plantaginaceae no clear positively selected sites were identified. Possible reasons for this result are discussed. Indirect experimental evidence suggests that the identified positively selected amino acid sites play a role in specificity determination. The percentage of positively selected sites is similar in Solanaceae and Rosaceae but the location of those sites is different.
authors: Instituto de Biologia Celular e Molecular (IBMC), University of Porto, Rua do Campo Alegre 823, 4150-180 Porto, Portugal.
authors: Jorge
authors: J
authors: Vieira
authors: Ramiro
authors: R
authors: Morales-Hojas
authors: Raquel A M
authors: RA
authors: Santos
authors: Cristina P
authors: CP
authors: Vieira
mesh_terms: D000595:Amino Acid Sequence; D019143:Evolution, Molecular; D005298:Fertility / Q000235:genetics; D027845:Malus / Q000201:enzymology / Q000235:genetics; D008969:Molecular Sequence Data; D027861:Prunus / Q000201:enzymology / Q000235:genetics; D031989:Pyrus / Q000201:enzymology / Q000235:genetics; D012098:Reproduction / Q000235:genetics; D012260:Ribonucleases / Q000235:genetics*; D027824:Rosaceae / Q000201:enzymology / Q000235:genetics*; D012641:Selection, Genetic; D017386:Sequence Homology, Amino Acid
chemical_list: D012260:Ribonucleases
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