Journal Article

Ancient genome duplications during the evolution of kiwifruit (<i>Actinidia</i>) and related Ericales

Tao Shi, Hongwen Huang and Michael S. Barker

in Annals of Botany

Published on behalf of The Annals of Botany Company

Volume 106, issue 3, pages 497-504
Published in print September 2010 | ISSN: 0305-7364
Published online June 2010 | e-ISSN: 1095-8290 | DOI: http://dx.doi.org/10.1093/aob/mcq129
Ancient genome duplications during the evolution of kiwifruit (Actinidia) and related Ericales

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  • Ecology and Conservation
  • Evolutionary Biology
  • Plant Sciences and Forestry

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Background and Aims

To assess the number and phylogenetic distribution of large-scale genome duplications in the ancestry of Actinidia, publicly available expressed sequenced tags (ESTs) for members of the Actinidiaceae and related Ericales, including tea (Camellia sinensis), were analysed.

Methods

Synonymous divergences (Ks) were calculated for all duplications within gene families and examined for evidence of large-scale duplication events. Phylogenetic comparisons for a selection of orthologues among several related species in Ericales and two outgroups permitted placement of duplication events in relation to lineage divergences. Gene ontology (GO) categories were analysed for each whole-genome duplication (WGD) and the whole transcriptome.

Key Results

Evidence for three ancient WGDs in Actinidia was found. Analyses of paleologue GO categories indicated a different pattern of retained genes for each genome duplication, but a pattern consistent with the dosage-balance hypothesis among all retained paleologues.

Conclusions

This study provides evidence for one independent WGD in the ancestry of Actinidia (Ad-α), a WGD shared by Actinidia and Camellia (Ad-β), and the well-established At-γ WGD that occurred prior to the divergence of all taxa examined. More ESTs in other taxa are needed to elucidate which groups in Ericales share the Ad-β or Ad-α duplications and their impact on diversification.

Keywords: Paleopolyploidy; Actinidiaceae; Ericales; Actinidia; Camellia; kiwi; genome duplication; dosage balance

Journal Article.  5073 words.  Illustrated.

Subjects: Ecology and Conservation ; Evolutionary Biology ; Plant Sciences and Forestry

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