Delineation of QTLS for resistance to fire blight in malus Robusta 5 accessions (P467)

Gardiner Susan E., Norelli John L., De Silva Nihal, Peil Andreas, Horner Mary, Bowatte Deepa, Carlisle Charmaine, Aldwinckle Herb S., Malnoy Mickael, Baldo Angela M., Bassett Carole L., Celton Jean-Marc, Bus Vincent G.M.. 2011. Delineation of QTLS for resistance to fire blight in malus Robusta 5 accessions (P467). 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 Janvier 2011/19 Janvier 2011.

Résumé : Breeding of fire blight resistant scions and rootstocks is a goal of several international apple breeding programmes, as options are limited for management of this destructive disease of caused by the bacterial pathogen Erwinia amylovora. Genetic mapping of quantitative trait loci (QTLs) for resistance has been a first step towards enabling marker assisted selection for fire blight resistance. A large effect QTL for fire blight resistance has been previously reported on Linkage Group (LG) 3 of Malus 'Robusta 5' (Peil et al. 2007, 2008). In this study, we first re-considered the quantification of the complex disease phenotype in two 'Robusta 5' mapping populations used in previous studies and then employed both composite interval mapping (CIM) for analysis of single QTLs and the additional QTL mapping (addqtl) function of R/qtl software. CIM enabled the resolution of individual QTLs at distinct locations in the two populations with peaks located 6 cM apart. The upper of these two QTL co-located with a leucine-rich repeat receptor-like protein (MxdRLP1) candidate resistance gene. Subsequent analysis with addqtl enabled the detection of an additional QTL in one of the mapping populations where a single QTL had previously been mapped. The additional QTL was in a similar location to the upper of the two QTL detected by CIM. Allelotypic differences within LG3 that were detected between the 'Robusta 5' clones used in the study are believed to underlie the differential effects in the two mapping populations. (Texte intégral)

Classification Agris : F30 - Génétique et amélioration des plantes

Auteurs et affiliations

• Gardiner Susan E., New Zealand Institute for Plant and Food Research (NZL)
• Norelli John L., USDA (USA)
• De Silva Nihal, New Zealand Institute for Plant and Food Research (NZL)
• Peil Andreas, JKI (DEU)
• Horner Mary, New Zealand Institute for Plant and Food Research (NZL)
• Bowatte Deepa, New Zealand Institute for Plant and Food Research (NZL)
• Carlisle Charmaine, New Zealand Institute for Plant and Food Research (NZL)
• Aldwinckle Herb S., Cornell University (USA)
• Malnoy Mickael, Cornell University (USA)
• Baldo Angela M., USDA (USA)
• Bassett Carole L., USDA (USA)
• Celton Jean-Marc, CIRAD-BIOS-UMR AGAP (FRA)
• Bus Vincent G.M., New Zealand Institute for Plant and Food Research (NZL)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/559908/)

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