Abstract
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.
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