Phylogenetic relationships between the chlorophyll a/b binding protein (CAB) multigene family: An intra- and interspecies study

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Abstract
The genome ofGlycine max (L.) Merr. cv. “Dare” contains a chlorophyll a/b binding (Cab) protein gene family consisting of 10 genes. The primary structures of two linkedCab genes (Cab 4 andCab 5) were determined. A comparison of the nucleic acid and predicted amino acid sequences ofCab 4 andCab 5 revealed a high degree of similarity (96% and 98%, respectively). Phylogenetic inferences drawn from sequence comparisons between previously characterized soybeanCab 1, 2, and 3 andCab 4 and 5 suggested that soybeanCab 3 was an evolutionarily distant member within this family. We further investigated the molecular evolution of theCab gene family by comparing nucleotide sequences from 25 differentCab genes representing diverse phylogenetic taxa including moncot and dicot species. Phylogenetic inferences from these data support existing morphological phylogenies in that all species within one family clustered together. These data suggested that the Solanaceae were more evolutionarily distant from the monocots than the Fabaceae and Brassicaceae. In addition, these data supported the theory thatCab Type I and II genes originated prior to divergence of the monocots and dicots.