期刊
BOTANICAL JOURNAL OF THE LINNEAN SOCIETY
卷 178, 期 2, 页码 243-266出版社
OXFORD UNIV PRESS
DOI: 10.1111/boj.12276
关键词
annual; alpine; Eurasia; genome size; hebe; New Zealand; Plantaginaceae; PGLS; polyploidy; species radiation
资金
- Alexander von Humboldt Foundation Experienced Researcher Fellowship
- Spanish Ministerio de Ciencia e Innovacion, programa FPU
- Spanish Ministerio de Economia y Competitividad [CGL2009-07555, CGL2012-32574]
- New Zealand Core Funding for Crown Research Institutes from the Ministry of Business, Innovation and Employment's Science and Innovation Group
The study of genome size evolution in a phylogenetic context in related polyploid and diploid lineages can help us to understand the advantages and disadvantages of genome size changes and their effect on diversification. Here, we contribute 199 new DNA sequences and a nearly threefold increase in genome size estimates in polyploid and diploid Veronica (Plantaginaceae) (to 128 species, c. 30% of the genus) to provide a comprehensive baseline to explore the effect of genome size changes. We reconstructed internal transcribed spacer (ITS) and trnL-trnL-trnF phylogenetic trees and performed phylogenetic generalized least squares (PGLS), ancestral character state reconstruction, molecular dating and diversification analyses. Veronica 1C-values range from 0.26 to 3.19pg. Life history is significantly correlated with 1C-value, whereas ploidy and chromosome number are strongly correlated with both 1C- and 1Cx-values. The estimated ancestral Veronica 1Cx-value is 0.65pg, with significant genome downsizing in the polyploid Southern Hemisphere subgenus Pseudoveronica and two Northern Hemisphere subgenera, and significant genome upsizing in two diploid subgenera. These genomic downsizing events are accompanied by increased diversification rates, but a core shift' was only detected in the rate of subgenus Pseudoveronica. Polyploidy is important in the evolution of the genus, and a link between genome downsizing and polyploid diversification and species radiations is hypothesized.(c) 2015 The Linnean Society of London, Botanical Journal of the Linnean Society, 2015, 178, 243-266.
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