A multigene phylogeny of the Gelidiales including nuclear large-subunit rRNA sequence data |
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Authors: | D. Wilson Freshwater J. Craig Bailey |
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Affiliation: | (1) Center for Marine Science Research, UNCW, 7205 Wrightsville Avenue, Wilmington, NC 28403, USA;(2) Bigelow Laboratory for Ocean Sciences, PO Box 475, McKown Point, West Boothbay Harbor, ME 04575-0475, USA |
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Abstract: | Partial sequences (1032 bp) of the nuclear-encoded large ribosomal RNA gene (LSU) were determined for 16 gelidialean species, and analyzed separately and in combination with plastid rbcL and nuclear SSU gene sequences. The number of informative characters and levels of sequence divergence among taxa are intermediate in LSU sequences as compared to that for rbcL and SSU. Analyses of the separate LSU, and a combined LSU, SSU, and rbcL data sets have identified early-diverging lineages within the Gelidiales including Gelidiella, Pterocladia, Pterocladiella, and a lineage including Gelidium and species classified in other genera. The relationships among most gelidialean taxa are well-resolved and well-supported by analyses of the combined data; however, the relationships of Ptilophora and Capreolia remain unclear. It is speculated that these two lineages have diverged from a common ancestor over an evolutionarily short period of time. This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | Gelidiales phylogeny gene evolution LSU rbc L SSU |
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