Journal of Plant Research

, Volume 113, Issue 3, pp 281–283 | Cite as

The Karyotype Analysis of Somatic Chromosomes in Amborella trichopoda (Amborellaceae)

  • Kazuo Oginuma
  • Tanguy Jaffré
  • Hiroshi Tobe
Short Communication

Amborella trichopoda

Baill. (Amborellaceae), which, based on multiple gene analyses, was recently identified as the first branch in the angiosperm evolution, has somatic chromosomes of 2n=26 (x=13). At metaphase all the chromosomes have centromeres at the median position. Chromosomes of one pair are longer than those of the 12 remaining pairs, and have a secondary or small constriction. Based on karyotype analysis, as well as a survey of chromosome numbers in two other earliest lineages (i.e., Nymphaeaceae and Illiciales), the x=13 of Amborella is likely to be derived from x=14. The hypothesis that x=7 is the original base number in the angiosperms was briefly discussed.

Keywords: Amborella, Amborellaceae, Chromosomes, Karyotype 


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Copyright information

© The Botanical Society of Japan 2000

Authors and Affiliations

  • Kazuo Oginuma
    • 1
  • Tanguy Jaffré
    • 2
  • Hiroshi Tobe
    • 3
  1. 1.Faculty of Human Life and Environmental Science, Kochi Women's University, Kochi, 780–8515 JapanJP
  2. 2.Botany Department, IRD, BP A5, Noumea, New CaledoniaNC
  3. 3.Department of Botany, Graduate School of Science, Kyoto University, Kyoto, 606–8502 JapanJP

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