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DNA variation in the F18L15-130 region, which contains a receptor-like protein kinase gene, was analyzed for the wild plants Arabidopsis thaliana and Arabis gemmifera. In A. thaliana, at least three divergent sequence types were observed (trimorphism), instead of two distinct sequence types (dimorphism) detected in most of other nuclear gene regions studied for this plant species. Intragenic recombinations among the divergent sequence types generated four recombinant sequence types, although pattern of intragenic recombinations was complex. The estimated nucleotide variation in A. thaliana was the highest (pi = 0.0226 and theta = 0.0228) among genes investigated in this plant so far. The high level of nucleotide variation is due to divergence among the three distinct sequence types, each of which has a low level of nucleotide variation. Tests of Tajima, and Fu and Li did not detected deviation from neutrality, except for replacement sites, for which significantly negative Fu and Li's test value was detected. These results suggest that the receptor-like protein kinase gene in this region is functional. Possible causes for the trimorphic pattern of DNA polymorphism was discussed.

Trimorphic DNA variation in the receptor-like protein kinase gene in the F18L15-130 region of the wild plant Arabidopsis thaliana.