Centromere separation and association in the nuclei of an interspecific hybrid between Torenia fournieri and T. baillonii (Scrophulariaceae) during mitosis and meiosis
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概要
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In the nuclei of some interspecific hybrid and allopolyploid plant species, each genome occupies a separate spatial domain. To analyze this phenomenon, we studied localization of the centromeres in the nuclei of a hybrid between Torenia fournieri and T. baillonii during mitosis and meiosis using three-dimensional fluorescence in situ hybridization (3D-FISH) probed with species-specific centromere repeats. Centromeres of each genome were located separately in undifferentiated cells but not differentiated cells, suggesting that cell division might be the possible force causing centromere separation. However, no remarkable difference of dividing distance was detected between chromatids with different centromeres in anaphase and telophase, indicating that tension of the spindle fiber attached to each chromatid is not the cause of centromere separation in Torenia. In differentiated cells, centromeres in both genomes were not often observed for the expected chromosome number, indicating centromere association. In addition, association of centromeres from the same genome was observed at a higher frequency than between different genomes. This finding suggests that centromeres within one genome are spatially separated from those within the other. This close position may increase possibility of association between centromeres of the same genome. In meiotic prophase, all centromeres irrespective of the genome were associated in a certain portion of the nucleus. Since centromere association in the interspecific hybrid and amphiploid was tighter than that in the diploid parents, it is possible that this phenomenon may be involved in sorting and pairing of homologous chromosomes.
- 日本遺伝学会の論文
- 2007-10-25
著者
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Kikuchi Shinji
Laboratory Of Plant Genetics And Breeding Science Faculty Of Agriculture Tottori University
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Wako Toshiyuki
Division Of Plant Sciences National Institute Of Agrobiological Sciences
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KIKUCHI Shinji
The United Graduated School of Agricultural Sciences, Tottori University
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TANAKA Hiroyuki
Faculty of Agriculture, Tottori University
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TSUJIMOTO Hisashi
Faculty of Agriculture, Tottori University
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Tsujimoto Hisashi
Faculty Of Agriculture Tottori University
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Tsujimoto Hisashi
Tottori Univ. Tottori Jpn
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Tanaka Hiroyuki
Laboratory Of Plant Genetics And Breeding Science Faculty Of Agriculture Tottori University
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Tanaka Hiroyuki
Faculty Of Agriculture Tottori University
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Tanaka Hiroyuki
Lab. Of Plant Genetics Fac. Of Agriculture Tottori Univ.
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Tanaka Hiroyuki
Laboratory Of Plant Genetics Faculty Of Agriculture Tottori University
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