Polymorphic Chromosomal Specificity of Centromere Satellite Families in Arabidopsis halleri ssp. gemmifera |
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| Authors: | Akira Kawabe Shuhei Nasuda |
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| Institution: | (1) Laboratory of Plant Genetics, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, 606-8502 Sakyo-ku Kyoto, Japan;(2) CREST, Japan Science and Technology Corporation, 101-0062 Tokyo, Japan;(3) Institute of Evolutionary Biology, University of Edinburgh, Ashworth Laboratories King’s Buildings, West Mains Road, EH9 3JT Edinburgh, UK |
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| Abstract: | The chromosomal localizations of repetitive DNA clusters (ribosomal DNA and centromere satellites) were analyzed by fluorescent
in situ hybridization in five strains of Arabidopsis halleri ssp. gemmifera. All five A. gemmifera strains have three chromosome pairs with 45S (5.8S-16S-26S) rDNA loci, and one pair with both 5S and 45S rDNA loci. These
localizations are different from that of A. thaliana. Very unusually, there are three families of centromeric satellite DNAs (pAa, pAge1, and pAge2), and they showed polymorphism
among the five strains studied. Overall, we found four different centromere satellite compositions. A plant from Fumuro was
heterozygous for the chromosome specificities of centromere satellite families, possibly due to a reciprocal translocation
involving centromere regions. Changes of centromeric satellite repeats appear to be rapid and frequent events in the history
of A. gemmifera, and seem to occur by exchanging clusters as units. |
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| Keywords: | Arabidopsis halleri ssp gemmifera centromere rDNA repetitive sequence satellite DNA |
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