Molecular Assessment Of PPV Resistance In An Interspecific Peach – P. davidiana BC1 Progeny
Micali, S.; Dettori. M.T.; Ferretti, L.; Vendramin, E.; Giovinazzi, J.; Aramini, V.; Pasquini, G.; Barba, M.; Quarta, R.; Verde, I.
Plant & Animal Genomes XIX Conference
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harka, caused by Plum Pox PotyVirus (PPV), is one the most detrimental diseases of Prunus species. No curative treatment is currently available against the virus and within the peach [P. persica (L.) Batsch] germplasm no useful genes conferring resistance to PPV have been identified. P. davidiana, a Chinese wild peach relative, resistant to several pests and diseases including plum pox virus, was used as male parent for producing peach interspecific hybrids.
In the present research the offspring of the cross between the PPV susceptible peach cultivar ‘Maria Aurelia’ and the resistant hybrid SD 81 (P. persica x P. davidiana) was used to assess at the molecular level the resistance. A linkage map was produced using microsatellite markers and a QTL analysis was performed to localize genomic region(s) involved in the PPV resistance.
The genetic map is composed of 59 loci distributed into 9 linkage groups which can be traced back to the eight peach chromosomes.
The QTL analysis has revealed the presence of two genomic regions involved in the resistance, one in the distal part of linkage group 1 and one in the distal part of LG 7. This latter region is also involved in the QTL for the so called ‘Restricted Downward Movement’ trait, which takes into account translocation of the virus within the plant.
The availability of a molecular marker strictly linked to PPV resistance would be of great value for speeding up the production of resistant peach varieties through marker assisted selection breeding procedures.