Varietal Dependence of GLVs Accumulation and LOX-HPL Pathway Gene Expression in Four Vitis Vinifera Wine Grapes
Overview
Chemistry
Molecular Biology
Affiliations
Variety is one of the major factors influencing grape and wine aromatic characteristics. Green leaf volatiles (GLVs), derived from lipoxygenase-hydroperoxides lyase (LOX-HPL) pathway, are important components for the aromatic quality of grapes and wines. However, the varietal difference regarding GLVs accumulation and related gene expression are poorly studied. This work exhibited that the accumulation of various GLVs and the expression of LOX-HPL pathway genes in four wine grape cultivars: Syrah, Muscat Tchervine, Gewürztraminer and Chardonnay. The results showed a variety dependence of GLVs profile. Muscat Tchervine harvested grapes contained less C6 aldehydes and the most abundant esters, which corresponded to very low and expression abundance as well as high transcript in this variety. High expression level of both and paralleled with higher level of C6 aldehydes together with higher alcohols in Syrah grape. Gewürztraminer and Chardonnay grapes had high aldehydes and alcohols as well as low esters, which were resulted from their higher expression level of or and lower . From these above corresponding relations, it is concluded that , and in the LOX-HPL pathway are targets for altering GLVs composition in the grape varieties.
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