Arid
DOI10.1600/036364412X616738
Phylogeny and Cytogeography of the North American Creosote Bush (Larrea tridentata, Zygophyllaceae)
Laport, Robert G.; Minckley, Robert L.; Ramsey, Justin
通讯作者Laport, Robert G.
来源期刊SYSTEMATIC BOTANY
ISSN0363-6445
出版年2012
卷号37期号:1页码:153-164
英文摘要

The North American creosote bush (Larrea tridentata, Zygophyllaceae) is a widespread and ecologically dominant taxon of North American warm deserts. The species is comprised of diploid, tetraploid, and hexaploid populations, and touted as a classical example of an autopolyploid taxonomic complex. Here we use flow cytometry and DNA sequence data (non-coding cpDNA and nuclear ribosomal DNA) to evaluate spatial and evolutionary relationships among cytotype races, as well as the origins of the species from its South American ancestors. We find the geographic distribution of North American cytotypes to be highly structured, with limited co-occurrence within populations. Diploids reside only in the Chihuahuan Desert, as reported in previous biosystematic surveys, but tetraploid and hexaploid populations interdigitate along the margins of the Sonoran and Mojave Deserts. In phylogenetic analyses, North American plants comprise a monophyletic grouping that is sister to the South American diploid species, L. divaricata. North American populations exhibit genetic signatures of rapid demographic expansion, including a star-shaped genealogy, unimodal distribution of pairwise haplotype differences, and low genetic structure. Nonetheless, polyploid cytotypes are consistently distinguished from diploid cytotypes by a cpDNA indel character, suggesting a single origin of tetraploidy in the species. These findings suggest a recent origin of the North American creosote bush via long distance dispersal, with establishment of polyploid populations accompanying its rapid spread through the Northern Hemisphere.


英文关键词cpDNA chromosome evolution molecular systematics nrDNA phylogeography
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000299799300019
WOS关键词MITOCHONDRIAL-DNA ; NUCLEOTIDE SUBSTITUTION ; FLOWERING PLANTS ; SPECIES DISJUNCTIONS ; TRANSCRIBED SPACER ; CHLOROPLAST DNA ; SOUTH AMERICA ; SEQUENCES ; RATES ; DESERT
WOS类目Plant Sciences ; Evolutionary Biology
WOS研究方向Plant Sciences ; Evolutionary Biology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/175141
作者单位Univ Rochester, Dept Biol, Rochester, NY 14627 USA
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Laport, Robert G.,Minckley, Robert L.,Ramsey, Justin. Phylogeny and Cytogeography of the North American Creosote Bush (Larrea tridentata, Zygophyllaceae)[J],2012,37(1):153-164.
APA Laport, Robert G.,Minckley, Robert L.,&Ramsey, Justin.(2012).Phylogeny and Cytogeography of the North American Creosote Bush (Larrea tridentata, Zygophyllaceae).SYSTEMATIC BOTANY,37(1),153-164.
MLA Laport, Robert G.,et al."Phylogeny and Cytogeography of the North American Creosote Bush (Larrea tridentata, Zygophyllaceae)".SYSTEMATIC BOTANY 37.1(2012):153-164.
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