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Title:
The frequency of polyploid speciation in vascular plants
Authors:
Wood, Troy E.; Takebayashi, Naoki; Barker, Michael S.; Mayrose, Itay; Greenspoon, Philip B.; Rieseberg, Loren H.
Affiliation:
AA(Institute for Evolution and Biodiversity, University of Münster, 48149 Münster, Germany; Department of Biology, Indiana University, Bloomington, IN 47405), AB(Institute of Arctic Biology and Department of Biology and Wildlife, University of Alaska, Fairbanks, AK 99775), AC(Department of Biology, Indiana University, Bloomington, IN 47405; Departments of Botany and), AD(Zoology, University of British Columbia, Vancouver, BC, Canada V6T 1Z4), AE(Departments of Botany and), AF(Department of Biology, Indiana University, Bloomington, IN 47405; Departments of Botany and)
Publication:
Proceedings of the National Academy of Sciences, Volume 106, Issue 33, 2009, pp.13875-13879
Publication Date:
08/2009
Origin:
CROSSREF; PNAS
DOI:
10.1073/pnas.0811575106
Bibliographic Code:
2009PNAS..10613875W

Abstract

Since its discovery in 1907, polyploidy has been recognized as an important phenomenon in vascular plants, and several lines of evidence indicate that most, if not all, plant species ultimately have a polyploid ancestry. However, previous estimates of the frequency of polyploid speciation suggest that the formation and establishment of neopolyploid species is rare. By combining information from the botanical community's vast cytogenetic and phylogenetic databases, we establish that 15% of angiosperm and 31% of fern speciation events are accompanied by ploidy increase. These frequency estimates are higher by a factor of four than earlier estimates and lead to a standing incidence of polyploid species within genera of 35% (n = 1,506). Despite this high incidence, we find no direct evidence that polyploid lines, once established, enjoy greater net species diversification. Thus, the widespread occurrence of polyploid taxa appears to result from the substantial contribution of polyploidy to cladogenesis, but not from subsequent increases in diversification rates of polyploid lines.
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