Karyomorphology of Some Trapaceae in Japan

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  • 日本産ヒシ科数種の核形態
  • Karyomorphology of some Trapaceae in Ja

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Karyomorphology of four taxa of Trapa native to Japan were studied for the first time using meristematic cells of young leaves. Chromosome numbers reported are 2n=48 in T. incisa, 2n=96 in T. japonica, 2n=48 in T. natans var. japonica, and 2n=ca. 96 in T. natans var. pumila. 2n=96 in T. japonica and 2n=ca. 96 in T. natans var. pumila are numbers unknown elsewhere in the genus so far. Features common to all the taxa investigated are : (1) interphase nucleus has the simple chromocenter type ; (2) chromosomes at metaphase mostly small(0, 3-1.2μm long by our methods) ; (3) χ=24(or 12). Evidence available suggests that 2n=96 in T. japonica and 2n=ca. 96 in T. natans var. pumila are amphiploids hybridized between T. incisa and T. natans var. japonica with 2n=48.

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