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Nucleotide sequence of rbc L and phylogenetic relationships of Setchellanthus caeruleus (Setchellanthaceae)
Author(s) -
Karol Kenneth G.,
Rodman James E.,
Conti Elena,
Sytsma Kenneth J.
Publication year - 1999
Publication title -
taxon
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 81
eISSN - 1996-8175
pISSN - 0040-0262
DOI - 10.2307/1224435
Subject(s) - biology , sister group , phylogenetic tree , clade , evolutionary biology , botany , genetics , gene
Summary Karol, K. G., Rodman, J. E., Conti, E. & Sytsma, K. J.: Nucleotide sequence of rbc L and phylogenetic relationships of Setchellanthus caeruleus (Setchellanthaceae). – Taxon 48: 303‐315. 1999. – ISSN 0040‐0262. The nucleotide sequence (1462 bases) from the chloroplast gene for the large subunit of ribulose‐l,5‐bisphosphate carboxylase/oxygenase (rbc L ) was utilised for the monotypic Mexican endemic genus Setchellanthus to assess its phylogenetic affinities. Phylogenetic analyses of rbc L sequence data robustly group Setchellanthus with other mustard oil producing plants included in Dahlgren's expanded order Capparales. Within this assemblage, maximum parsimony places Setchellanthus sister to a clade comprised of the North American family Limnanthaceae, the sister taxa Koeberlinia + Salvadora + Batis, and the core Capparales (Brassicaceae + Capparaceae, Gyrostemonaceae + Resedaceae, Pentadiplandraceae, and Tovariaceae). Maximum likelihood analyses reverse the relationship of Setchellanthus and Limnanthaceae, placing Setchellanthus sister to the Koeberlinia + Salvadora + Batis plus the core Capparales assemblage, with Limnanthaceae sister to these. The rbc L sequence of Setchellanthus possesses a putative stop codon ending at position 1440, twelve bases beyond the 1428 site usual for dicots. This extended 3' terminus is consistent within the expanded Capparales for a clade mat comprises the above‐named taxa. The position of Setchellanthus in the rbc L phylogram provides support for elevation of this unispecific genus to family rank, postulated in view of its unique morphological characters.