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Annals of Botany 82: 189-194, 1998
© 1998 Annals of Botany Company

Nuclear DNA Content of 26 Orchid (Orchidaceae) Genera with Emphasis onDendrobium

W. E. JONES, A. R. KUEHNLE+, and K. ARUMUGANATHAN

Department of Horticulture, University of Hawaii at Manoa, 3190 Maile Way, Honolulu, HI, 96822–2279 Center for Biotechnology, University of Nebraska, N322 The Beadle Center, Lincoln, NE, 68588–0665, USA

March 18, 1997 ; September 24, 1997 . April 17, 1998 .

2C DNA content values for 70 orchid species from 26 genera, including 37Dendrobiumspecies from eight taxonomic sections, were analysed using flow cytometry. The resulting nuclear DNA content values for species other thanDendrobiumranged from 1.91 pg 2C-1to 15.19 pg 2C-1nuclei forCadetia tayloriandVanilla phaeantha, respectively.Dendrobiumnuclear DNA content values ranged from 1.53 pg 2C-1to 4.23 pg 2C-1nuclei forD. cruentumandD. spectabile, respectively. DNA content measurements varied greatly withinDendrobiumsections Latouria and Spatulata. Nuclear DNA content values for the six species analysed within Latouria ranged from 1.88 pg 2C-1nuclei forD. macrophyllumto 4.23 pg 2C-1nuclei forD. spectabile. Nuclear DNA content values for the 16 species analysed within Spatulata ranged from 1.69 pg 2C-1nuclei forD. discolorto 4.05 pg 2C-1nuclei forD. samoense. The least variation in DNA content was found within the section Phalaenanthe, with nuclear DNA content values of 1.79 pg  2C-1, 1.86 pg 2C-1and 1.98 pg 2C-1forD. bigibbum,D. affineandD. phalaenopsis, respectively.Copyright 1998 Annals of Botany Company

Orchidaceae,Dendrobium, flow cytometry, propidium iodide, nuclear DNA, genome size, 2C values.


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