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Originally published as Genetics Published Articles Ahead of Print on April 19, 2006.
Genetics, Vol. 173, 1157-1167, June 2006, Copyright © 2006
doi:10.1534/genetics.104.037267
Comparison of the Genome Structure of the Self-Incompatibility (S) Locus in Interspecific Pairs of S Haplotypes
Ryo Fujimoto*,
Keiichi Okazaki
,
Eigo Fukai*,1,
Makoto Kusaba
and
Takeshi Nishio*,2
* Graduate School of Agricultural Science, Tohoku University, Sendai 981-8555, Japan, Faculty of Agriculture, Niigata University, Niigata 950-2181, Japan and Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan
2 Corresponding author: Graduate School of Agricultural Science, Tohoku University, Tsutsumidori-Amamiyamachi 1-1, Aoba-ku, Sendai 981-8555, Japan.
E-mail: nishio{at}bios.tohoku.ac.jp
The determinants of recognition specificity of self-incompatibility in Brassica are SRK in the stigma and SP11/SCR in the pollen, both of which are encoded in the S locus. The nucleotide sequence analyses of many SRK and SP11/SCR alleles have identified several interspecific pairs of S haplotypes having highly similar sequences between B. oleracea and B. rapa. These interspecific pairs of S haplotypes are considered to be derived from common ancestors and to have maintained the same recognition specificity after speciation. In this study, the genome structures of three interspecific pairs of S haplotypes were compared by sequencing SRK, SP11/SCR, and their flanking regions. Regions between SRK and SP11/SCR in B. oleracea were demonstrated to be much longer than those of B. rapa and several retrotransposon-like sequences were identified in the S locus in B. oleracea. Among the seven retrotransposon-like sequences, six sequences were found to belong to the ty3 gypsy group. The gag sequences of the retrotransposon-like sequences were phylogenetically different from each other. In Southern blot analysis using retrotransposon-like sequences as probes, the B. oleracea genome showed more signals than the B. rapa genome did. These findings suggest a role for the S locus and genome evolution in self-incompatible plant species.
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