The Karyotype Analysis of Somatic Chromosomes in Amborella trichopoda (Amborellaceae) |
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Authors: | Kazuo Oginuma Tanguy Jaffré Hiroshi Tobe |
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Affiliation: | (1) Faculty of Human Life and Environmental Science, Kochi Women's University, Kochi, 780–8515 Japan, JP;(2) Botany Department, IRD, BP A5, Noumea, New Caledonia, NC;(3) Department of Botany, Graduate School of Science, Kyoto University, Kyoto, 606–8502 Japan, JP |
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Abstract: | 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. Received 30 May 2000/ Accepted in revised form 22 July 2000 |
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Keywords: | : Amborella Amborellaceae Chromosomes Karyotype |
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