Phylogenetic Studies Using Protein Sequences Within the Order Myrtales

Abstract
N-terminal sequences (40 amino acids) of ribulose bisphosphate carboxylase small subunit are presented for representatives of Myrtaceae (2 spp.), Melastomataceae (2 spp.), Combretaceae (2 spp.), Lythraceae (2 spp.), Thymelaeaceae (2 spp.), Onagraceae (11 spp.), Buxaceae sensu lato (2 spp.), Euphorbiaceae (2 spp.), and Tiliaceae (2 spp.). In minimal phylogenetic trees the two members of most families pair well, while, in Onagraceae, the phylogenetic tree gives a reasonable approximation to the expectations from taxonomy. The first four families group together as expected for families of Myrtales, but Onagraceae are slightly separate. Thymelaeaceae grouped with the Myrtales families. In order to test the hypothesis that Thymelaeaceae are related to Euphorbiales and both to Malvales, phylogenetic trees embracing all groups were derived. Thymelaeaceae failed to group with Malvales but both showed relationships to Myrtales. Within Euphorbiales and Malvales, grouping of species conformed well with expectations.

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