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Viburnales: Cytological Features and a New Circumscription
Ana Maria Benko-Iseppon and Wilfried Morawetz
Vol. 49, No. 1 (Feb., 2000), pp. 5-16
Published by: International Association for Plant Taxonomy (IAPT)
Stable URL: http://www.jstor.org/stable/1223927
Page Count: 12
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Cytological studies carried out in 98 species (22 genera out of eight families: Caprifoliaceae, Sambucaceae, Viburnaceae, Adoxaceae, Valerianaceae, Dipsacaceae, Morinaceae, and Calyceraceae) of the Dipsacales s.l. and the eventually related families Cornaceae, and Hydrangeaceae point to a very close relationship between the Viburnaceae, Sambucaceae and Adoxaceae, corroborating the inclusion of these families into an order different from the Dipsacales, namely the Viburnales. Many cytological features shared by these families differ strongly from the Dipsacales s.str., especially (1) chromosome size and morphology, (2) the presence of cold induced chromosome regions (CIRs), (3) interphase nuclear structure, and (4) chromosome condensing behaviour at prophase. Cornaceae and Hydrangeaceae present similar interphase nuclei, but differ from the Viburnales by other karyomorphological characters. The results are discussed with respect to previous morphological, embryological, and molecular findings.
Taxon © 2000 International Association for Plant Taxonomy (IAPT)