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Characterisation of cDNAs for ribulose bisphosphate carboxylase small subunit genes in different species of Avena (Poaceae)

ABSTRACT We report the cloning and sequencing of 14 rbcS cDNAs in six species of Avena (Poaceae) with different genome and ploidy levels. The nucleotide sequences 504 bp long were aligned with the published sequences of cultivated hexaploid oat, wheat, barley, rye, rice and corn and subjected to cladistic and phenetic analyses. The parsimonious analysis generated a tree with a topology very similar to the phenogram generated by the Neighbor-Joining analysis based on the Jukes and Cantor distances. Within the monophyletic assemblage of the tribe Aveneae, consistent clades composed of rbcS clones belonging to different species are recognized. It is suggested that they correspond to orthologous genes belonging to different subfamilies, and that the “within-species˚d homogenisation may have occurred at a slow rate with respect to species evolution. In the monophyletic group of Pooideae, the topologies place barley rbcS sequences closer to wheat and rye than to oat sequences. This grouping agrees with most taxonomic and phylogenetic views.