Sexual Plant Reproduction

, Volume 7, Issue 3, pp 169–176 | Cite as

Molecular cloning of two Solanum chacoense S-alleles and a hypothesis concerning their evolution

  • Charles Després
  • Marc Saba-El-Leil
  • Sylvain R. Rivard
  • David Morse
  • Mario Cappadocia
Original Paper


The polymerase chain reaction (PCR) has been used to clone two S-alleles (S13 and S14) from Solanum chacoense. The two alleles do not cross-hybridize on genomic Southern blots or on northern blots using stylar RNA. Although the S14 message was not detected in a stylar cDNA library prepared from mature flowers, a full-length copy of the S13 coding sequence was isolated by screening with the PCR fragment. We have analysed the sequences of the S13 cDNA and the S14 PCR fragment (60% of the mature protein coding sequence) in the context of S-RNase evolution, and propose that random point mutations may be sufficient to generate new S-alleles. Based on a phylogenetic tree composed of RNase sequences containing the conserved RNase motifs HGLWP and KHGXC, we suggest that gametophytic self-incompatibility genes are RNase genes that have acquired a new function in the gametophytic self-incompatibility system early in the evolution of flowering plants.

Key words

Polymerase chain reaction Self-incompatibility Solanaceae Ribonuclease 


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Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • Charles Després
    • 1
  • Marc Saba-El-Leil
    • 1
  • Sylvain R. Rivard
    • 1
  • David Morse
    • 1
  • Mario Cappadocia
    • 1
  1. 1.Institut de Recherche en Biologie Végétale, Université de MontréalMontréalCanada

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