Journal of Molecular Evolution

, Volume 65, Issue 2, pp 175–185

Different Positively Selected Sites at the Gametophytic Self-Incompatibility Pistil S-RNase Gene in the Solanaceae and Rosaceae (Prunus, Pyrus, and Malus)

  • Jorge Vieira
  • Ramiro Morales-Hojas
  • Raquel A. M. Santos
  • Cristina P. Vieira
Article

DOI: 10.1007/s00239-006-0285-6

Cite this article as:
Vieira, J., Morales-Hojas, R., Santos, R.A.M. et al. J Mol Evol (2007) 65: 175. doi:10.1007/s00239-006-0285-6

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.

Keywords

Gametophytic self-incompatibilityS-RNasePositive selection

Supplementary material

239_2006_285_Supp.pdf (109 kb)
Supplementary material

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Jorge Vieira
    • 1
  • Ramiro Morales-Hojas
    • 1
  • Raquel A. M. Santos
    • 1
  • Cristina P. Vieira
    • 1
  1. 1.Instituto de Biologia Celular e Molecular (IBMC)University of PortoPortoPortugal