Hausmann, Ludger

Maul, Erika

Röckel, Franco

Töpfer, Reinhard

English

JKI Open Journal Systems (Julius Kühn-Institut)

9th Young Scientists Meeting, Quedlinburg, Germany, November 09-11, 2016 Röckel et al. ‘Riesling Rot’ and other grapevine berry color mutants from the German-speaking area Franco Röckel, Ludger Hausmann, Erika Maul, Reinhard Töpfer Julius Kühn-Institut, Institute for Grapevine Breeding Geilweilerhof, Siebeldingen Email of corresponding author: franco.roeckel@julius-kuehn.de The first mention of ‘Riesling’ goes back to a bill of the Earls of Katzenelnbogen in Rüsselsheim from the year 1435. However, a unified spelling of the name ‘Riesling’ did not exist at that time. The variety was mentioned in the course of the 15th century as among others with the name Rueßelinge, Ruesseling, Rüszlinge or Ruszling. The origin of the name is to this day highly controversial. According to the latest findings by the researcher Prof. Dr. Jürgen Udolph, the name derives from the so called ‘Rußflecken’ (soot stains, lenticels), which become visible at a later ripening stage. As an offspring of ‘Heunisch Weiss’ and a presumed seedling of ‘Traminer’ and Vitis sylvestris, it can be assumed that ‘Riesling Weiss’ originat-ed in the Rhine Valley between Karls-ruhe and Worms. With an acreage of 23.440 hectares (22.9% of the total German winegrowing area) in the year 2014, ‘Riesling Weiss’ is the most wide-ly planted grapevine variety in Germa-ny. About the origin of the colored varia-tion ‘Riesling Rot’ it is not much known. However, it can be suggested that the cultivar was already present in the mixed plantings of the late Middle Ages with a low acreage. After the phylloxera crisis, the variety disappeared nearly completely, but survived in collections and was interspersed in a few old vine-yards. After the process of clonal selection starting in 1991, ‘Riesling Rot’ is classified for the wine growing region Hessen since 2002. Compared to other color mutants, the variety shows a rela-tively high back mutation rate to white and due to its world famous relative ‘Riesling Weiss’, the public interest on the color origin of this cultivar is very high. The anthocyanin biosynthesis in blue/ black varieties is controlled by two ad-jacent MYB-related transcription factor genes, VvmybA1 and VvmybA2, where-as two loss-of-function mutations in both genes, an insertion of a Ty3-gypsy-type retrotransposon (Gret1) in the promoter region of VvmybA1 and two amino acid-changing mutations in the coding sequence of VvmybA2, were identified leading in combination to a non-functional white allele. Due to re-combination events of the white allele, red-skinned cultivars like ‘Riesling Rot’ should possess at least one functional myb-gene variant leading to a weaker anthocyanin formation compared to typical red wine cultivars with blue/ black berries. This work focuses on the molecular analysis of the color recovery in ‘Ries-ling Rot’ and other color mutants of famous varieties from the German-speaking area like ‘Silvaner Blau’ or ‘Elbling Rot’. Berichte aus dem Julius Kühn-Institut 186 37

‘Riesling Rot’ and other grapevine berry color mutants from the German-speaking area

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‘Riesling Rot’ and other grapevine berry color mutants from the German-speaking area

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