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Molecular Biology and Evolution, Vol 10, 140-162, Copyright © 1993 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

Molecular phylogenies in angiosperm evolution

W Martin, D Lydiate, H Brinkmann, G Forkmann, H Saedler and R Cerff
Institut fur Genetik, Technische Universitat Braunschweig, Germany.

We have cloned and sequenced cDNAs for the glyceraldehyde-3-phosphate dehydrogenase of glycolysis, gapC, from a bryophyte, a gymnosperm, and three angiosperms. Phylogenetic analyses are presented for these data in the context of other gapC sequences and in parallel with published nucleotide sequences for the chloroplast encoded gene for the large subunit of ribulose-1,5-bisphosphate carboxylase/oxygenase (rbcL). Relative-rate tests were performed for these genes in order to assess variation in substitution rate for coding regions, along individual plant lineages studied. The results of both gene analyses suggest that the deepest dichotomy within the angiosperms separates not magnoliids from remaining angiosperms, but monocotyledons from dicotyledons, in sharp contrast to prediction from the Euanthial theory for angiosperm evolution. Furthermore, these chloroplast and nuclear sequence data taken together suggest that the separation of monocotyledonous and dicotyledonous lineages took place in late Carboniferous times [approximately 300 Myr before the present (Mybp)]. This date would exceed but be compatible with the late-Triassic (approximately 220 Mybp) occurrence of fossil reproductive structures of the primitive angiosperm Sanmiguelia lewisii.
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