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Identification of causal mutations of metabolic QTLs associated to grape and wine flavor

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Identification of causal mutations of metabolic QTLs associated to grape and wine flavor

Paula Moreno-Sanz

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, Francesco Emanuelli

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, Silvia Lorenzi

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, Xiaoguang Yu

1

,

Laura Costantini

1

, Sergio Moser

2

, Roberto Larcher

2

, Juri Battilana

1

, M. Stella Grando

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Fondazione Edmund Mach - IASMA, Via Mach 1 San Michele all’Adige 38010 Trento, Italy

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Research and Innovation Centre

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Technology Transfer Centre

Secondary metabolites produced in grapevine berries play an essential role in high-quality wines and also contribute to the quality of table grapes. Some of the most prevalent wine odor constituents are monoterpenoids which biosynthesis via the plastidial methyl-erythritol- phosphate (MEP) pathway has been demonstrated in grapevine.

Based on a double pseudo-testcross mapping strategy, we detected a major QTL on LG 5 for

linalool, nerol and geraniol content in grapevine berries at ripening time, and also an

additional QTL for linalool on LG 10. Further testing indicated that gain-of-function

mutations in the structural gene of the MEP pathway 1-deoxy-D-xylulose-5-phosphate

synthase (VvDXS1) - colocalized with the mQTL on chromosome 5 - are the major

determinants for terpenoid accumulation in Muscat grape varieties and have direct effects on

the enzymatic or regulatory properties of the DXS protein. Similarly, association of genetic

variants with the content of several volatile aromatic compounds were tested for candidate

genes in the mQTL interval on chromosome 10. These findings may pave the way for

metabolic engineering of terpenoid contents in grapevine.

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