title: QTL analysis of flowering time and ripening traits suggests an impact of a genomic region on linkage group 1 in Vitis.
abstract: In the recent past, genetic analyses of grapevine focused mainly on the identification of resistance loci for major diseases such as powdery and downy mildew. Currently, breeding programs make intensive use of these results by applying molecular markers linked to the resistance traits. However, modern genetics also allows to address additional agronomic traits that have considerable impact on the selection of grapevine cultivars. In this study, we have used linkage mapping for the identification and characterization of flowering time and ripening traits in a mapping population from a cross of V3125 ('Schiava Grossa' × 'Riesling') and the interspecific rootstock cultivar 'Börner' (Vitis riparia × Vitis cinerea). Comparison of the flowering time QTL mapping with data derived from a second independent segregating population identified several common QTLs. Especially a large region on linkage group 1 proved to be of special interest given the genetic divergence of the parents of the two populations. The proximity of the QTL region contains two CONSTANS-like genes. In accordance with data from other plants such as Arabidopsis thaliana and Oryza sativa, we hypothesize that these genes are major contributors to control the time of flowering in Vitis.
authors.affiliation: Institute for Grapevine Breeding, Julius Kuehn-Institute, Federal Research Centre for Cultivated Plants, Geilweilerhof, 76833, Siebeldingen, Germany, iris.fechter@jki.bund.de.
authors.forename: Iris
authors.initials: I
authors.lastname: Fechter
authors.forename: Ludger
authors.initials: L
authors.lastname: Hausmann
authors.forename: Eva
authors.initials: E
authors.lastname: Zyprian
authors.forename: Margrit
authors.initials: M
authors.lastname: Daum
authors.forename: Daniela
authors.initials: D
authors.lastname: Holtgräwe
authors.forename: Bernd
authors.initials: B
authors.lastname: Weisshaar
authors.forename: Reinhard
authors.initials: R
authors.lastname: Töpfer
mesh_terms: D001947:Breeding; D002874:Chromosome Mapping / Q000379:methods; D032461:Chromosomes, Plant; D018744:DNA, Plant / Q000235:genetics; D035264:Flowers / Q000502:physiology*; D008040:Genetic Linkage; D005819:Genetic Markers; D018895:Microsatellite Repeats; D040641:Quantitative Trait Loci; D027843:Vitis / Q000235:genetics* / Q000502:physiology
chemical_list: D018744:DNA, Plant; D005819:Genetic Markers
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