Ripening profile of grape berry acids and sugars in University of Minnesota wine grape cultivars, select vitis vinifera, and other hybrid cultivars
2013-08
View/Download File
Persistent link to this item
Statistics
View StatisticsJournal Title
Journal ISSN
Volume Title
Title
Ripening profile of grape berry acids and sugars in University of Minnesota wine grape cultivars, select vitis vinifera, and other hybrid cultivars
Authors
Published Date
2013-08
Publisher
Type
Thesis or Dissertation
Abstract
Recent introduction of new cold-hardy grape (<italic>Vitis sp.</italic>) cultivars has fueled a growing wine industry in non-traditional temperate growing regions. Though widely grown, little is known of the chemical composition of the cold-hardy wine grape cultivars. To develop a profile of the ripening process and quantify key grape berry metabolites, chemical analyses were performed on University of Minnesota wine grape cultivars, select <italic>V. vinifera</italic> cultivars, and other hybrid cultivars throughout fruit ripening. Organic acid and sugar concentrations of the eleven wine grape cultivars were determined using liquid chromatography/ mass spectrometry (LC/MS). All cultivars maintained glucose to fructose ratio of approximately 1:1 ratio and tartaric to malic ratio varied between years and cultivars. Cold-hardy wine grape cultivars `Frontenac', `Frontenac gris', and `La Crescent' retain higher concentrations of organic acids throughout berry development. Year was found to have little or no effect on malic or tartaric acid concentrations. Soluble solids content (SSC), titratable acidity (TA), pH and berry weight measurements were taken for three consecutive years (2010-2012). TA and pH profiles varied substantially among the years. TA, SSC, and pH were compared to growing degree days (GDD) to determine the number of heat units needed to ripen the selected cultivars and investigate if GDD is a valid predictor for grape maturity. Cold-hardy hybrid need approximately 1,400 GDD˚C to ripen fruit in Minnesota. GDD was found to be useful in predicting grape berry maturity especially SSC levels.
Keywords
Description
University of Minnesota M.S. thesis. August 2013. Major: Applied Plant Sciences. Advisors: James J. Luby and Adrian D. Hegeman. 1 computer file (PDF); vi, 82 pages.
Related to
Replaces
License
Series/Report Number
Funding information
Isbn identifier
Doi identifier
Previously Published Citation
Suggested citation
Content distributed via the University Digital Conservancy may be subject to additional license and use restrictions applied by the depositor. By using these files, users agree to the Terms of Use. Materials in the UDC may contain content that is disturbing and/or harmful. For more information, please see our statement on harmful content in digital repositories.