Widespread Cytotypic Variation, Cytogeography and Dynamic Analysis of <i>Lysimachia mauritiana</i> (Primulaceae) on Amamioshima, Kakeromajima and Tokunoshima Islands in the Amami Group of the Ryukyu Archipelago, Japan

Access this Article

Author(s)

    • Kono Yoshiko
    • The Community Center for the Advancement of Education and Research at the University of Kochi
    • Hoshi Yoshikazu
    • Department of Plant Science, School of Agriculture, Tokai University
    • Yokota Masatsugu
    • Laboratory of Ecology and Systematics, Faculty of Science, University of the Ryukyus
    • Oginuma Kazuo
    • The Community Center for the Advancement of Education and Research at the University of Kochi

Abstract

Our continuous investigations revealed that a coastal herb, <i>Lysimachia mauritiana</i>, exhibited a wide-ranging intraspecific karyotypic polymorphism (18 cytotypes) in the Ryukyu Archipelago of Japan. Recently it is suggested that the small island Takarajima including 11 cytotypes showed the highest intraspecific karyotypic diversity both within and among populations in the Ryukyus. To explore karyotypic variations on its adjacent three islands, Amamioshima, Kakeromajima and Tokunoshima, karyomorphological and cytogeographical analyses were conducted in 452 individuals from 27 localities throughout the islands. A total of five different chromosome numbers (2<i>n</i>=16, 17, 18, 19, 20) and 15 cytotypes were recognized in the area. Except for two, two to six cytotypes coexisted in every locality. The islands showed different dominant cytotypes,<i> i.e. </i>16 (6<b>m</b>) in Amamioshima Is., unknown in Kakeromajima Is. and 18 (6<b>m</b>) in Tokunoshima Is. Furthermore, it is suggested that cytotypes in northeast area in Amamioshima Is. might be converged to 16 (6<b>m</b>) in the near future by dynamic analyses in cytotype.

Journal

  • CYTOLOGIA

    CYTOLOGIA 80(2), 193-202, 2015

    Japan Mendel Society, International Society of Cytology

Codes

Page Top