A grapevine (Vitis vinifera L.) deoxy-D: -xylulose synthase gene colocates with a major quantitative trait loci for terpenol content.
Linalool, geraniol, nerol, citronellol and alpha-terpineol are isoprenoid molecules responsible for specific aromas found in grapes and wines. Total concentrations (free and bound forms) of these compounds were measured in the skins of mature berries during 2 successive years in two progenies obtained from Muscat Ottonel and Gewurztraminer selfings. Partial genetic maps based on microsatellite markers were constructed and several quantitative trait loci (QTLs) related to terpenol content were detected. A major QTL on linkage group (LG) 5 colocated with a deoxy-D: -xylulose synthase gene, coding for the first enzyme of the plastidial isoprenoid biosynthesis pathway. The number of favourable alleles at this locus determined the level of terpenol synthesis. A second QTL, on LG 10, was found to determine the balance linalool versus geraniol and nerol in the Muscat self-progeny plants.
Duchêne
Eric
E
INRA, UMR 1131 Santé de la Vigne et Qualité du Vin, 28, rue de Herrlisheim, BP 20507, 68021, Colmar, France. duchene@colmar.inra.fr
Butterlin
Gisèle
G
Claudel
Patricia
P
Dumas
Vincent
V
Jaegli
Nathalie
N
Merdinoglu
Didier
D
D000080462:Acyclic Monoterpenes; D002874:Chromosome Mapping; D032461:Chromosomes, Plant; D000081005:Cyclohexane Monoterpenes; D053138:Cyclohexenes / Q000378:metabolism; D008040:Genetic Linkage; D018598:Minisatellite Repeats; D039821:Monoterpenes / Q000378:metabolism; D010940:Plant Proteins / Q000235:genetics*; D040641:Quantitative Trait Loci; D013729:Terpenes / Q000378:metabolism*; D027843:Vitis / Q000201:enzymology / Q000235:genetics* / Q000378:metabolism
D000080462:Acyclic Monoterpenes; D000081005:Cyclohexane Monoterpenes; D053138:Cyclohexenes; D039821:Monoterpenes; D010940:Plant Proteins; D013729:Terpenes; C016775:alpha-terpineol; C018584:linalool; C007836:geraniol