Genetics, Vol. 156, 313-325, September 2000, Copyright © 2000

Retrotransposon Evolution in Diverse Plant Genomes

Tim Langdona, Charlotte Seagoa, Michael Mendeb, Michael Leggettb, Huw Thomasb, John W. Forstera,c, Howard Thomasb, R. Neil Jonesa, and Glyn Jenkinsa
a Institute of Biological Science, University of Wales, Aberystwyth SY23 3DD, United Kingdom,
b Institute of Grassland and Environmental Research, Aberystwyth SY23 3EB, United Kingdom
c Plant Biotechnology Centre, Agriculture Victoria, La Trobe University, Victoria 3083, Australia

Corresponding author: Glyn Jenkins, Institute of Biological Sciences, Cledwyn Building, University of Wales, Aberystwyth, Penglais, Aberystwyth, Ceredigion SY23 3DD, United Kingdom., gmj{at}aber.ac.uk (E-mail)

Communicating editor: C. S. GASSER

Retrotransposon or retrotransposon-like sequences have been reported to be conserved components of cereal centromeres. Here we show that the published sequences are derived from a single conventional Ty3-gypsy family or a nonautonomous derivative. Both autonomous and nonautonomous elements are likely to have colonized Poaceae centromeres at the time of a common ancestor but have been maintained since by active retrotransposition. The retrotransposon family is also present at a lower copy number in the Arabidopsis genome, where it shows less pronounced localization. The history of the family in the two types of genome provides an interesting contrast between "boom and bust" and persistent evolutionary patterns.




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