Phylogeographic evidence of crop neo-diversity in Sorghum : [Abstract W101]

De Alencar Figueiredo Lucio Flavio, Calatayud Caroline, Dupuits Céline, Billot Claire, Rami Jean-François, Brunel Dominique, Perrier Xavier, Courtois Brigitte, Deu Monique, Glaszmann Jean-Christophe. 2009. Phylogeographic evidence of crop neo-diversity in Sorghum : [Abstract W101]. In : Abstracts of Plant and Animal Genomes XVII Conference, San Diego, CA (USA), January 10-14, 2009. s.l. : s.n., Résumé Plant and Animal Genomes Conference. 17, San Diego, États-Unis, 10 Janvier 2009/14 Janvier 2009.

Résumé : We report here a study on sorghum, using a well characterized sample of diverse cultivars that we resequenced for portions of six genes possibly involved in grain quality variation. Our study was based on 1.7 Mbp sequence data enabling a comparison between 129 to 184 accessions of sorghum for six genes and 1008 to 3771 bp per gene. A total of 170 polymorphisms, including 141 SNPs and 29 Insertion/Deletion Polymorphisms, were recorded within a total of 11279 bp scored. We analysed the distribution of polymorphisms by comparing the area of origin of sorghum and areas where sorghum migrated in the course of domestication and subsequent human migrations. We observed an array of situations. On one hand we have polymorphisms which are distributed in agreement with a neutral hypothesis, on the other extreme we have Opaque2, for which new polymorphisms have appeared in areas outside the area of origin. This, we argue, is novel diversity which was selected by man in the course of domestication: crop neo-diversity. Documentation of the extent of crop neo-diversity is very important. In breeding it might explain how narrow-based populations can be improved in the long term; in germplasm management it implies reformatting concepts and approaches, whereby diversity is not just reduced from wild to landraces and to improved materials; it may stimulate studies which investigate patterns of diversity in regions where crops were 'adapted' by man, in the search for adaptive neo-diversity. (Texte intégral)

Mots-clés Agrovoc : Sorghum

Classification Agris : F30 - Génétique et amélioration des plantes
F70 - Taxonomie végétale et phytogéographie

Auteurs et affiliations

• De Alencar Figueiredo Lucio Flavio, UCB (BRA)
• Calatayud Caroline, CIRAD-BIOS-UMR DAP (FRA)
• Dupuits Céline, INRA (FRA)
• Billot Claire, CIRAD-BIOS-UMR DAP (FRA)
• Rami Jean-François, CIRAD-BIOS-UMR DAP (FRA) ORCID: 0000-0002-5679-3877
• Brunel Dominique, INRA (FRA)
• Perrier Xavier, CIRAD-BIOS-UPR Multiplication végétative (FRA) ORCID: 0000-0002-0092-003X
• Courtois Brigitte, CIRAD-BIOS-UMR DAP (FRA) ORCID: 0000-0003-2118-7102
• Deu Monique, CIRAD-BIOS-UMR DAP (FRA)
• Glaszmann Jean-Christophe, CIRAD-BIOS-DIR (FRA) ORCID: 0000-0001-9918-875X

Source : Cirad - Agritrop (https://agritrop.cirad.fr/548779/)

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