S-allele diversity in Sorbus aucuparia and Crataegus monogyna (Rosaceae: Maloideae)

Content Provider	Semantic Scholar
Author	Raspé, Olivier Kohn, Joshua R.
Copyright Year	2002
Abstract	RT-PCR was used to obtain the first estimates from natural populations of allelic diversity at the RNase-based gametophytic self-incompatibility locus in the Rosaceae. A total of 20 alleles were retrieved from 20 Sorbus aucuparia individuals, whereas 17 alleles were found in 13 Crataegus monogyna samples. Estimates of population-level allele numbers fall within the range observed in the Solanaceae, the only other family with RNase-based incompatibility for which estimates are available. The nucleotide diversity of S-allele sequences was found to be much lower in the two Rosaceae species as compared with the Solanaceae. This was not due to a lower sequence divergence among most closely related alleles. Rather, it is the depth of the entire genealogy that differs markedly in the two families, with Rosaceae S-alleles exhibiting more recent apparent coalescence. We also investigated patterns of selection at the molecular level by comparing nucleotide diversity at synonymous and nonsynonymous sites. Stabilizing selection was inferred for the 5′ region of the molecule, while evidence of diversifying selection was present elsewhere.
Starting Page	458
Ending Page	465
Page Count	8
File Format	PDF HTM / HTML
DOI	10.1038/sj.hdy.6800079
PubMed reference number	12180088
Journal	Medline
Volume Number	88
Alternate Webpage(s)	http://labs.biology.ucsd.edu/kohn/resources/Kohn-Lab-Papers/Raspe-and-Kohn-2002.pdf
Alternate Webpage(s)	https://doi.org/10.1038/sj.hdy.6800079
Journal	Heredity
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article