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Clonal differences and impact of defoliation on Sauvignon blanc ( Vitis vinifera L.) wines: a chemical and sensory investigation
Author(s) -
Šuklje Katja,
Antalick Guillaume,
Buica Astrid,
Langlois Jennifer,
Coetzee Zelmari A,
Gouot Julia,
Schmidtke Leigh M,
Deloire Alain
Publication year - 2016
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.7165
Subject(s) - wine , chemistry , vitis vinifera , food science , clone (java method) , sensory analysis , aroma of wine , aroma , horticulture , biology , biochemistry , dna
BACKGROUND The aim of this study, performed on Sauvignon blanc clones SB11 and SB316 , grafted on the same rootstock 101–14 Mgt ( Vitis riparia × V. ruperstris ) and grown at two adjacent vineyards, was two‐fold: (1) to study wine chemical and sensory composition of both clones within an unaltered canopy; and (2) to determine the effect of defoliation (e.g. bunch microclimate) on wine chemical and sensory composition. RESULTS Orthogonal projection to latent structures discriminate analysis ( OPLS‐DA ) was applied to the concentration profiles of volatile compounds derived from gas chromatography–mass spectrometry data. The loadings directions inferred that 3‐isobutyl‐2‐methoxypyrazine ( IBMP ) discriminated control treatments (shaded fruit zone) of both clones from defoliation treatments (exposed fruit zone), whereas 3‐sulfanyl‐hexan‐1‐ol ( 3SH ), 3‐sulfanylhexyl acetate ( 3SHA ), hexanol, hexyl hexanoate and some other esters discriminated defoliated treatments from the controls. The OPLS‐DA indicated the importance of IBMP , higher alcohol acetates and phenylethyl esters, for discrimination of clone SB11 from clone SB316 irrespective of the treatment. Defoliation in the fruit zone significantly decreased perceived greenness in clone SB11 and elevated fruitier aromas, whereas in clone SB316 the effect of defoliation on wine sensory perception was less noticeable regardless the decrease in IBMP concentrations. CONCLUSION These findings highlight the importance of clone selection and bunch microclimate to diversify produced wine styles. © 2015 Society of Chemical Industry