Genetic Analysis of Downy Mildew Resistance Derived From Muscadinia Rotundifolia

An Extended Leaf Disc Test for Virulence Assessment in Plasmopara Viticola and Detection of Downy Mildew Resistance in Vitis

“…This kind of reaction, which would correspond to a nonhost resistance, is more durable than the one conferred by R genes. Type I nonhost resistance (preformed plant defense mechanisms) would be ideal for breeding because it does not involve a hypersensitive reaction [36]. These results are of special interest, since species closely related to V. vinifera constitute potential sources of resistance genes against downy mildew e.g.…”

Detection of downy and powdery mildew resistance QTL in a ‘Regent’ × ‘RedGlobe’ population

“…The first of these loci, Run1, was identified and mapped on chromosome 12 of M. rotundifolia (Pauquet et al 2001;Donald et al 2002;Merdinoglu et al 2003;Barker et al 2005). This locus was found to be closely linked to the Rpv1 locus (Merdinoglu et al 2003).…”

“…Many of these loci were originally reported without specific gene names some of which were later assigned names in the catalogue of mapped resistance loci (http://www.vivc.de), leaving a few reported loci unnamed. Rpv1 on chromosome 12 (Merdinoglu et al 2003) was identified in a cross between the susceptible V. vinifera 'Syrah' and the resistant '28-8-78' (derived from M. rotundifolia). This locus, which explained 73 % of the total phenotypic variance observed, was mapped to chromosome 12 of '28-8-78'.…”

Behavior of grape breeding lines with distinct resistance alleles to downy mildew (Plasmopara viticola)

“…The locus Rpv1 is located on chromosome 12 of M. rotundifolia, and it is associated to locus Run1, which confers resistance to downy mildew (Barker et al 2005, Merdinoglu et al 2003. Rpv1/Run1 alleles were introduced in V. vinifera by backcrossing (Pauquet et al 2001).…”