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Self-incompatibility of Prunus tenella and evidence that reproductively isolated species of Prunus have different SFB alleles coupled with an identical S-RNase allele

AutorŠurbanovski, Nada; Tobutt, Kenneth R.; Konstantinović, Miroslav; Maksimović, Vesna; Sargent, Daniel J.; Stevanović, Vladimir; Ortega, Encarnación ; Bošković, Radovan I.
Palabras claveAllele
Fecha de publicación25-abr-2007
CitaciónPlant Journal 50(4): 723-734 (2007)
ResumenMany species of Prunus display an S-RNase-based gametophytic self-incompatibility (SI), controlled by a single highly polymorphic multigene complex termed the S-locus. This comprises tightly linked stylar- and pollen-expressed genes that determine the specificity of the SI response. We investigated SI of Prunus tenella, a wild species found in small, isolated populations on the Balkan peninsula, initially by pollination experiments and identifying stylar-expressed RNase alleles. Nine P. tenella S-RNase alleles (S1–S9) were cloned; their sequence analysis showed a very high ratio of non-synonymous to synonymous nucleotide substitutions (Ka/Ks) and revealed that S-RNase alleles of P. tenella, unlike those of Prunus dulcis, show positive selection in all regions except the conserved regions and that between C2 and RHV. Remarkably, S8-RNase, was found to be identical to S1-RNase from Prunus avium, a species that does not interbreed with P. tenella and, except for just one amino acid, to S11 of P. dulcis. However, the corresponding introns and S-RNase–SFB intergenic regions showed considerable differences. Moreover, protein sequences of the pollen-expressed SFB alleles were not identical, harbouring 12 amino-acid replacements between those of P. tenella SFB8 and P. avium SFB1. Implications of this finding for hypotheses about the evolution of new S-specificities are discussed.
Descripción12 pages, 7 figures.-- Accession numbers: DQ983363; DQ983364; DQ983365; DQ983366; DQ983367; DQ983368; DQ983369; DQ983370; DQ983371; DQ983372; DQ983373; DQ983374; DQ983375; EF061758.
Versión del editorhttp://dx.doi.org/10.1111/j.1365-313X.2007.03085.x
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