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High homologous gene conservation despite extreme autopolyploid redundancy in sugarcane (W315)

D'Hont Angélique, Garsmeur Olivier, Charron Carine, Zini Cyrille, Bocs Stéphanie, Jouffe Vincent, Samain Sylvie. 2011. High homologous gene conservation despite extreme autopolyploid redundancy in sugarcane (W315). In : Abstracts of Plant and Animal Genomes XIXth Conference, San Diego, CA (USA), January 15-19, 2011. s.l. : s.n., Résumé Plant and Animal Genomes Conference. 19, San Diego, États-Unis, 15 January 2011/19 January 2011.

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Abstract : Modern sugarcane (Saccharum spp.) has the highest level of 'vertical' redundancy (2n = 12x = 120) of all polyploid plants studied to date. It was produced about a century ago through hybridization between two autopolyploid species, namely S. officinarum and S. spontaneum. In order to investigate the genome dynamics in this highly polyploid context, we sequenced and compared seven hom(oe)ologous haplotypes (BAC clones). Our analysis revealed a high level of gene retention and colinearity, as well as high gene structure and sequence conservation. Remarkably, all of the hom(oe)ologous genes were predicted as being functional (except for one gene fragment) and showed signs of evolving under purifying selection, with the exception of genes within segmental duplications. By contrast, transposable elements displayed a general absence of colinearity among hom(oe)ologous haplotypes and appeared to have undergone dynamic expansion in Saccharum, compared with sorghum, its close relative in the Andropogonea tribe. These results reinforce the general trend emerging from recent studies indicating the diverse and nuanced effect of polyploidy on genome dynamics. (Texte intégral)

Mots-clés Agrovoc : Saccharum

Classification Agris : F30 - Plant genetics and breeding

Auteurs et affiliations

  • D'Hont Angélique, CIRAD-BIOS-UMR AGAP (FRA)

Contributeurs et affiliations

Autres liens de la publication

Source : Cirad - Agritrop (https://agritrop.cirad.fr/559909/)

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