Abstract
Karyotypic study of eight populations belonging to two Zygophyllum species indicated chromosome numbers of Zygophyllum eurypterum (six populations) and Zygophyllum eichwaldii (two populations) were diploid (2n = 2x = 22) and tetraploid (2n = 4x = 44), respectively. The chromosome number of these species is reported for the first time. There were significant variations among populations in most chromosomes and karyotype characteristics. Cluster analysis based on chromosomal characteristics separated populations into two major groups. The first group included two populations of Z. eichwaldii (diploid populations), while the second group included six populations of Z. eurypterum (tetraploid populations). The chromosomes were mostly metacentric (m) and sub-metacentric (sm) in all populations. The Stebbins classification system grouped all populations in class B, considered a primitive class in this system. These results may provide useful information for Zygophyllum evolutionary and breeding studies.
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