Abstract
In plant populations exhibiting gametophytic self-incompatibility, individuals harbouring rare S alleles are likely to have a reproductive advantage over individuals having more common alleles. Consequently, determination of the self-incompatibility haplotype of individuals is essential for genetic studies and the development of informed management strategies. This study characterises six new S alleles identified in wild cherry (Prunus avium L.). Investigations to determine the S genotype of individuals in recently planted woodland through length polymorphisms of introns associated with the stylar S-RNase gene and the pollen SFB gene revealed six S intron profiles which did not correspond to those of known S alleles. These are now attributed to S 27 to S 32 . Consensus primers, annealing in the S-RNase sequence coding for the signal peptide and C5 regions, were used to isolate the S-RNase alleles associated with the novel S intron profiles. The proteins corresponding to the new alleles were separated by isoelectric focusing from stylar extracts and their pI values determined. Similarities between the deduced amino acid sequence for the new alleles isolated and other cherry S-RNase sequences available on the databases ranged from 40% to 86%. Amplification products for SFB introns ranged from 172 to 208bp. New sequence regions exposed to positive selection were identified and the significance of the PS3 region reinforced. A phylogenetic relationship between P. avium S-RNases for S 10 and S 13 and between corresponding SFB alleles may indicate co-evolution of allele specificities of these two genes.
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Acknowledgements
This research was supported by funding from Defra and the Forestry Commission (Grant No.WD0502). The authors would also like to thank Bart De Cuyper and Dr. Tineke Sonneveld for provision of primers and P. avium material and for helpful discussions. Radovan Bošković acknowledges a grant from the Mount Trust.
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Communicated by A. Abbott
The nucleotide sequences reported in this paper have been submitted to the EMBL/GenBank database under the following accession numbers: S 27 (DQ266439), S 28 (DQ266440), S 29 (DQ266441), S 30 (DQ266442), S 31 (DQ266443), S 32 (DQ266444).
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Vaughan, S.P., Bošković, R.I., Gisbert-Climent, A. et al. Characterisation of novel S-alleles from cherry (Prunus avium L.). Tree Genetics & Genomes 4, 531–541 (2008). https://doi.org/10.1007/s11295-007-0129-6
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DOI: https://doi.org/10.1007/s11295-007-0129-6