Reconstructing relative genome size of vascular plants through geological time

Barry H. Lomax, Jason Hilton, Richard M. Bateman, Garland R. Upchurch, Janice A. Lake, Ilia J. Leitch, Avery Cromwell, Charles A. Knight

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)
143 Downloads (Pure)

Abstract

*The strong positive relationship evident between cell and genome size in both animals and plants forms the basis of using the size of stomatal guard cells as a proxy to track changes in plant genome size through geological time.
*We report for the first time a taxonomic fine-scale investigation into changes in stomatal guard-cell length and use these data to infer changes in genome size through the evolutionary history of land plants.
*Our data suggest that many of the earliest land plants had exceptionally large genome sizes and that a predicted overall trend of increasing genome size within individual lineages through geological time is not supported. However, maximum genome size steadily increases from the Mississippian (c. 360 million yr ago (Ma)) to the present.
*We hypothesise that the functional relationship between stomatal size, genome size and atmospheric CO2 may contribute to the dichotomy reported between preferential extinction of neopolyploids and the prevalence of palaeopolyploidy observed in DNA sequence data of extant vascular plants.
Original languageEnglish
Pages (from-to)636-644
Number of pages9
JournalNew Phytologist
Volume201
Issue number2
Early online date1 Oct 2013
DOIs
Publication statusPublished - Jan 2014

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