Articles

MARKER ASSISTED SELECTION FOR PL-1 POWDERY MILDEW RESISTANCE IN APPLE – OLD MARKERS FOR A NEW RESISTANCE GENE?

Article number
663_137
Pages
757 – 762
Language
English
Abstract
The major gene Pl-1 derived from Malus robusta has been used widely in breeding resistance to powdery mildew (Podosphaera leucotricha) in cultivated apple.
New AFLP markers for Pl-1 have been identified by a BSA approach.
A SCAR/CAPs marker was developed that is more closely linked to the resistance phenotype than the hitherto known marker for Pl-1, the SCAR marker AT20-450. Clear segregation patterns for resistance/susceptibility and a good correlation between phenotypical and marker data over three years under high mildew infection pressure is in agree-ment with the hypothesis that Pl-1 is controlled by a single major gene.
Furthermore, we present data from analyses evaluating our Pl-1 markers within the framework of the apple breeding programme at HortResearch.
In a population derived from a cross between X3191 x ‘Novosibirski Sweet’ OP, a linkage to a strong mildew resis-tance phenotype indicated that the “old” Pl-1 marker AT20-450 was linked to a strong mildew resistance gene segregating from ‘Novosibirski Sweet’ OP. It is still unknown if this “new” gene is identical to Pl-1. In a second breeding population, re-sulting from the cross ‘Royal Gala’ x ‘Robusta 5’ the Pl-1 markers did not correlate with the powdery mildew infection data.
This suggests that the ‘Robusta 5’ accession used as resistance donor in New Zealand also has a novel mildew resistance gene.
An-other explanation is discussed concerning the genetic situation at a putative second locus that might be acting as a precursor gene.
A genetic two-gene-model is presented that point out the relationship between the genetic situation regarding the two loci in segregating progenies and an applicability of MAS.

Publication
Authors
F. Dunemann, A. Urbanietz, S. Gardiner, S. Bassett, H. Bassett, W. Legg, R. Rusholme, V. Bus, C. Ranatunga
Keywords
Malus x domestica, Podosphaera leucotricha (Ell. et Ev.) Salm., apple breeding, disease resistance, gene mapping, molecular markers
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