C-band polymorphism in the karyotype of Paris tetraphylla A. Gray (Liliaceae).

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  • Miyamoto Junko
    Department of Biology, Faculty of Science, Chiba University
  • Kurita Siro
    Department of Biology, Faculty of Science, Chiba University

Abstract

We studied the C-banding patterns of Paris tetraphylla. Six hundred and ninety-two plants collected from 38 populations were examined. As is well known, the genome of this species consists of 5 chromosomes: A, B, C, D and E (Haga 1934). We were able to distinguish five corresponding kinds of C-bands. The first is an intermittent dot-like C-band wich appears at the centromeric and terminal regions of every chromosome. The second is a thick band appearing on the distal half of every short arm of the C chromosome. The third appears on either side of the NOR of the D chromosome. The fourth is a thick intercalary band on the long arm of the D chromosome. Banding patterns of the D chromosome were constant among all plants examined except the nonstandard 10 from the Ogura-san population. The fifth is a thin intercalary band observed in the A, B, C and E chromosomes. This fifth type shows inter-individual polymorphism and can be classified into four sub-types, 0, 1, 2 and 3. Frequency of these bands among populations is quite variable. However, some localization of particular banding patterns was found. Traditionally many geneticists have held that C-heterochromatin is genetically inert, but we consider that every C-heterochromatin of P. tetraphylla may have some important biological functions.

Journal

  • CYTOLOGIA

    CYTOLOGIA 55 (2), 301-313, 1990

    Japan Mendel Society, International Society of Cytology

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