Size is not everything: Rates of genome size evolution, not C-value, correlate with speciation in angiosperms

Mark N. Puttick, James Clark, Philip C.J. Donoghue

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

Angiosperms represent one of the key examples of evolutionary success, and their diversity dwarfs other land plants; this success has been linked, in part, to genome size and phenomena such as whole genome duplication events. However, while angiosperms exhibit a remarkable breadth of genome size, evidence linking overall genome size to diversity is equivocal, at best. Here, we show that the rates of speciation and genome size evolution are tightly correlated across land plants, and angiosperms show the highest rates for both, whereas very slow rates are seen in their comparatively species-poor sister group, the gymnosperms. No evidence is found linking overall genome size and rates of speciation. Within angiosperms, both the monocots and eudicots show the highest rates of speciation and genome size evolution, and these data suggest a potential explanation for the megadiversity of angiosperms. It is difficult to associate high rates of diversification with different types of polyploidy, but it is likely that high rates of evolution correlate with a smaller genome size after genome duplications. The diversity of angiosperms may, in part, be due to an ability to increase evolvability by benefiting from whole genome duplications, transposable elements and general genome plasticity.

Original languageEnglish
Article number20152289
Pages (from-to)1 - 8
Number of pages8
JournalProceedings of the Royal Society B: Biological Sciences
Volume282
Issue number1820
Early online date2 Dec 2015
DOIs
Publication statusPublished - 7 Dec 2015

Keywords

  • Angiosperms
  • Evolvability
  • Genome duplication
  • Genome size
  • Polyploidy

ASJC Scopus subject areas

  • Medicine(all)
  • Immunology and Microbiology(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Environmental Science(all)
  • Agricultural and Biological Sciences(all)

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