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Genetic linkage maps of two interspecific grape crosses ( Vitis spp.) used to localize quantitative trait loci for downy mildew resistance

Genetic linkage maps of two interspecific grape crosses ( Vitis spp.) used to localize quantitative trait loci for downy mildew resistance,10.1007/s11

Genetic linkage maps of two interspecific grape crosses ( Vitis spp.) used to localize quantitative trait loci for downy mildew resistance   (Citations: 1)
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Two populations (Pop) segregating quantitatively for resistance to downy mildew (DM), caused by Plasmopara viticola, were used to construct genetic maps and to carry out quantitative trait locus (QTL) analysis. Pop1 comprised of 174 F1 individuals from a cross of ‘Moscato Bianco’, a susceptible Vitis vinifera cultivar, and a resistant individual of Vitis riparia. Pop2 consisted of 94 progeny from a cross of two interspecific hybrids, ‘VRH3082 1-42’ and ‘SK77 5/3’, with resistance traits inherited from Vitis rotundifolia and Vitis amurensis, respectively. Resistance of progeny was measured in field and greenhouse conditions by visual evaluation of disease symptoms on leaves. Linkage maps of 1037.2 and 651 cM were built essentially with simple sequence repeat markers and were enriched with gene-derived single-strand conformational polymorphism and single-nucleotide polymorphism markers. Simple interval mapping and Kruskall–Wallis analysis detected a stable QTL involved in field resistance to DM on linkage group (LG) 7 of the Pop1 integrated map co-localized with a putative Caffeoyl-CoA O-methyltransferase-derived marker. Additional QTLs were detected on LGs 8, 12 and 17. We were able to identify genetic factors correlated with resistance to P. viticola with lower statistical significance on LGs 1, 6 and 7 of the Pop2 map. Finally, no common QTLs were found between the two crosses analyzed. A search of the grapevine genome sequence revealed either homologues to non-host-, host- or defense-signalling genes within the QTL intervals. These positional candidate genes may provide new information about chromosomal regions hosting phenotypic loci.
Journal: Tree Genetics & Genomes - TREE GENET GENOMES , vol. 7, no. 1, pp. 153-167, 2011
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    • ...et al. 2004; Fischer et al. 2004; Lowe andWalker 2006; Welter et al. 2007; Di Gaspero et al. 2007; Salmaso et al. 2008; Bellin et al. 2009; Marguerit et al. 2009; Moreira et al. 2010)...
    • ...Except Rpv2 from M. rotundifolia (Wiedemann-Merdinoglu et al. 2006), the QTLs previously identiWed for resistance to grapevine downy mildew only confer partial resistance (Merdinoglu et al. 2003; Fischer et al. 2004; Welter et al. 2007; Bellin et al. 2009; Marguerit et al. 2009; Moreira et al. 2010), and they are all assumed to directly or indirectly originate from American Vitis species...

    Paule Blasiet al. Construction of a reference linkage map of Vitis amurensis and genetic...

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