Phylogeography and polyploid evolution of North American goldenrods (Solidago subsect. Humiles, Asteraceae)
نویسندگان
چکیده
Aim We analysed range-wide chloroplast DNA (cpDNA) variation in a clade of North American goldenrods (Solidago subsect. Humiles) to infer its biogeographical history and evolution. Our objectives were to: (1) examine the structuring of cpDNA diversity in this widespread species complex, (2) reconstruct Pleistocene refugia and post-glacial migration of the study species, and (3) test hypotheses relating to the frequency of polyploidization. We expected the glacial history of Solidago to differ markedly from that of temperate trees and forest understorey plants.
منابع مشابه
Polyploidy, infraspecific cytotype variation, and speciation in Goldenrods: The cytogeography of Solidago subsect. Humiles (Asteraceae) in North America
Polyploidy is an important evolutionary mechanism in plants, and in some genera (e.g., Solidago in Asteraceae) it is particularly widespread and is hypothesized to have played a major role in diversification. Goldenrods are notorious for their ploidy variation, with roughly 14% and 32% of recognized North American species being polyploid or including multiple cytotypes, respectively. We used tr...
متن کاملGenus-wide microsatellite primers for the goldenrods (Solidago; Asteraceae)1
UNLABELLED PREMISE OF THE STUDY Microsatellite primers were developed for studies of polyploid evolution, ecological genetics, conservation genetics, and species delimitation in the genus Solidago. • METHODS AND RESULTS Illumina sequencing of a shotgun library from S. gigantea identified ca. 1900 putative single-copy loci. Fourteen loci were subsequently shown to be amplifiable, single-cop...
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There is growing realization that intraspecific polyploidy in plants has important implications for the evolution of plant diversity and for plant and plant-herbivore community dynamics. Nonetheless, the rate at which polyploid cytotypes arise and their fate in local mixed-cytotype populations are not well understood. Although within- and especially among-population cytotype variation has been ...
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Pleistocene climatic fluctuations had major impacts on desert biota in southwestern North America. During cooler and wetter periods, drought-adapted species were isolated into refugia, in contrast to expansion of their ranges during the massive aridification in the Holocene. Here, we use Melampodium leucanthum (Asteraceae), a species of the North American desert and semi-desert regions, to inve...
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The polyploid Hawaiian silversword alliance (Asteraceae), a spectacular example of adaptive radiation in plants, was shown previously to have descended from North American tarweeds of the Madia/Raillardiopsis group, a primarily diploid assemblage. The origin of the polyploid condition in the silversword alliance was not resolved in earlier biosystematic, cytogenetic, and molecular studies, apar...
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