Widespread cytotypic variation, cytogeography and dynamic analysis of <I>Lysimachia mauritiana</I> (Primulaceae) on Takarajima Island in the Ryukyu Archipelago of Japan

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    • Kono Yoshiko
    • Graduate School of Human Health Sciences, University of Kochi, 5-15 Eikokuji-cho, Kochi 780-8515, Japan
    • Hoshi Yoshikazu
    • Department of Plant Science, School of Agriculture, Tokai University, Kawayo, Minamiaso-mura, Aso-gun, Kumamoto 869-1404, Japan
    • Setoguchi Hiroaki
    • Graduate School of Human and Environmental Studies, Kyoto University, Yoshidanihonmatsu-cho, Sakyo-ku, Kyoto 606-8501, Japan
    • Yokota Masatsugu
    • Laboratory of Ecology and Systematics, Faculty of Science, University of the Ryukyus, 1 Senbaru, Nishihara-cho, Nakagami-gun, Okinawa 903-0213, Japan
    • Oginuma Kazuo
    • Department of Biology, Faculty of Human Life and Environmental Science, University of Kochi, 5-15 Eikokuji-cho, Kochi 780-8515, Japan


<I>Lysimachia mauritiana</I> displayed a comprehensive karyotypic polymorphism (18 cytotypes) in the Ryukyu Archipelago of Japan. To explore chromosome variation on Takarajima Island, karyomorphological analysis was made in 238 individuals from six localities throughout the island. Total five different chromosome numbers (2<I>n</I>=16, 17, 18, 19, 20) and 11 cytotypes were recognized in the area. In the localities of the island, multiple cytotypes coexisted and diversified every year among and within population, although populational coexistence of plural cytotypes was maintained. Especially, three cytotypes of 16 (6<B>m</B>), 17 (5<B>m</B>) and 18 (4<B>m</B>) co-occurred in every locality, indicating that they were involved in a formation of cytotypes in Takarajima Island.


  • Chromosome Botany

    Chromosome Botany 8(3), 47-52, 2013

    International Society of Chromosome Botany


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