Title: A Biosystematic and Phylogenetic Assessment of Sympatric Taxa in Blepharizonia (Compositae-Madiinae)
Abstract: Abstract Communicating Editor: Aaron Liston Mosaically sympatric populations of Blepharizonia plumosa subsp. plumosa and B. plumosa subsp. viscida occur in the eastern San Francisco Bay region, California. Results from pollen and chromosomal studies of artificial hybrids yielded evidence of low interfertility between individuals of different taxa. Low fertility of hybrids between taxa was associated with meiotic irregularities (e.g., failure of meiosis I). Phylogenetic analyses of 18S–26S nuclear ribosomal DNA sequences of the internal transcribed spacer (ITS) region from representatives of multiple populations of both groups yielded evidence for two well-supported evolutionary lineages corresponding to B. plumosa subsp. plumosa and B. plumosa subsp. viscida. Pairwise distances between ITS sequences of the two taxa approximate or exceed pairwise ITS sequence distances between species of tarweed genera that are closely related to Blepharizonia. Rate constancy of ITS sequence evolution allowed us to estimat...
Publication Year: 2009
Publication Date: 2009-01-24
Language: en
Type: article
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Cited By Count: 6
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