Abstract
Electrophoretic analysis of 26 enzyme coding genes was conducted on accessions of threeCitrullus species and the relatedPraecitrullus fistulosus andAcanthosicyos naudinianus. The isozyme phylogeny of the genusCitrullus and the related species was constructed based on pairwise measurements of the respective genetic distances between the species and races.P. fistulosus andA. naudinianus form two distinct outgroups toCitrullus which is characterized by two main clusters: The first includes twoC. colocynthis races and the second,C. lanatus andC. lanatus var.citroides, which are more closely related to each other than they are toC. ecirrhosus. The isozyme phylogeny is consistent with the variability in six seed protein bands and with the crossability relations among the examined species.
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