Abstract
Summary:As the results of the isolation of considerable number of tagged mutants defbctive in meiosis from Arabidopsis and other plants, and the introduction of a variety of techniques to analyze chromosomes and proteins in meiocytes into research of these plants, it has become possible to study meiosis at molecular level in plants. In our lab too, Arabidopsis has been used as experimental material and we studied the pairing process of homologous chromosome. We isolated a mutant, solo dancers(sds), which failed in bivalent formation at meiosis and produced sterile pollens. sds gene was proved to encode cyclin protein and to be expressed only in meiocytes. These results indicate that function of meiosis-specific cyclin is necessary for proper bivalent formation in Arabidopsis. Analysis of chromosome behavior during meiosis using fluorescent in situ hybridization(FISH)showed that centromeres attached each other when homologous chromosomes start paring and that at the last stage of metaphase I chromosomes were connected with their partners through their terminals, which suggested that centromeres and telomeres were playing still unknown roles at those stages.