title: Expression QTL mapping in grapevine--revisiting the genetic determinism of grape skin colour.
abstract: Expression quantitative locus (eQTL) mapping was proposed as a valuable approach to dissect the genetic basis of transcript variation, one of the prime causes of natural phenotypic variation. Few eQTL studies have been performed on woody species due to the difficulty in sample homogenisation. Based on previous knowledge on berry colour formation, we performed eQTL mapping in field experimentation of grapevine with appropriate sampling criteria. The transcript level of VvUFGT, a key enzyme for anthocyanin synthesis was measured by real-time qRT-PCR in grape berry on a 191-individual pseudo-F1 progeny, derived from a cross between Syrah and Grenache cultivars. Two eQTLs were identified: one, explaining 20%, of genotypic variance and co-locating with VvUFGT itself (cis-eQTL), was principally due to the contrast between Grenache alleles; the other, explaining 35% of genotypic variance, was a trans-eQTL due to Syrah allelic contrast and co-located with VvMYBAs, transcription factors known to activate the expression of VvUFGT. This study assessed and validated the feasibility of eQTL mapping approach in grapevine and offered insights and new hypotheses on grape skin colour formation.
authors.affiliation: INRA, UMR AGAP Amélioration Génétique et Adaptation des Plantes, 2 Place Viala, F-34060 Montpellier, France. huangyungfen@gmail.com
authors.forename: Yung-Fen
authors.initials: YF
authors.lastname: Huang
authors.forename: Yves
authors.initials: Y
authors.lastname: Bertrand
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Guiraud
authors.forename: Sandrine
authors.initials: S
authors.lastname: Vialet
authors.forename: Amandine
authors.initials: A
authors.lastname: Launay
authors.forename: Véronique
authors.initials: V
authors.lastname: Cheynier
authors.forename: Nancy
authors.initials: N
authors.lastname: Terrier
authors.forename: Patrice
authors.initials: P
authors.lastname: This
mesh_terms: D000872:Anthocyanins / Q000235:genetics* / Q000378:metabolism; D002874:Chromosome Mapping; D005638:Fruit / Q000235:genetics / Q000378:metabolism; D005838:Genotype; D010858:Pigmentation; D010940:Plant Proteins / Q000235:genetics* / Q000378:metabolism; D016133:Polymerase Chain Reaction; D040641:Quantitative Trait Loci; D027843:Vitis / Q000235:genetics* / Q000378:metabolism
chemical_list: D000872:Anthocyanins; D010940:Plant Proteins