Phylogenetic relationships of the liverworts (Hepaticae), a basal embryophyte lineage, inferred from nucleotide sequence data of the chloroplast gene rbcL

Molecular Phylogenetics and Evolution
L A LewisR Vilgalys

Abstract

Sequence data from the chloroplast-encoded gene rbcL were obtained for 24 liverworts, a basal group of embryophytes. Maximum likelihood and parsimony analyses of these data, along with data from other major green plant lineages, confirm hypotheses based on morphological data, such as the paraphyly of bryophytes, and the basal position of liverworts. Molecular data corroborate the deep separation between the complex thalloid and leafy/simple thalloid liverworts implied by morphological data, but the monophyly of liverworts could not be rejected. The effects of accounting for site-to-site rate heterogeneity in these data were examined using maximum likelihood methods. Comparison of trees obtained with and without rate heterogeneity showed that simply allowing for heterogeneity had a greater improvement on likelihood score than optimization of transition/transversion bias. Incorporation of site-to-site rate heterogeneity in the larger analysis, however, did not necessarily change which topology was favored. Properties of rbcL sequences from the two liverwort groups were compared. Significantly different substitution rates were found between leafy/simple thalloid and complex thalloid liverwort taxa, with rates of rbcL sequence evol...Continue Reading

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