Skip to main content
Advertisement

Main menu

  • Home
  • Content
    • Current Volume
    • AJEV and Catalyst Archive
    • Best Papers
    • ASEV National Conference Technical Abstracts
    • Print on Demand
  • Information For
    • Authors
    • Open Access and Subscription Publishing
    • Submission
    • Subscribers
      • Proprietary Rights Notice for AJEV Online
    • Permissions and Reproductions
  • About Us
  • Feedback
  • Alerts
  • Help
  • Login
  • ASEV MEMBER LOGIN

User menu

  • Log in
  • Log out

Search

  • Advanced search
American Journal of Enology and Viticulture
  • Log in
  • Log out
  • Follow ajev on Twitter
  • Follow ajev on Linkedin
American Journal of Enology and Viticulture

Advanced Search

  • Home
  • Content
    • Current Volume
    • AJEV and Catalyst Archive
    • Best Papers
    • ASEV National Conference Technical Abstracts
    • Print on Demand
  • Information For
    • Authors
    • Open Access and Subscription Publishing
    • Submission
    • Subscribers
    • Permissions and Reproductions
  • About Us
  • Feedback
  • Alerts
  • Help
  • Login
  • ASEV MEMBER LOGIN
Article

Partial Defoliation of Vitis vinifera L. cv. Cabernet Sauvignon/99 Richter: Effect on Root Growth, Canopy Efficiency; Grape Composition, and Wine Quality

J. J. Hunter, H. P. Ruffner, C. G. Volschenk, D. J. Le Roux
Am J Enol Vitic.  1995  46: 306-314  ; DOI: 10.5344/ajev.1995.46.3.306
J. J. Hunter
Plant Physiologist, Plant Physiologist and Agricultural Research Technician, respectively, Nietvoorbij Institute for Viticulture and Oenology, Private Bag X5026, 7599 Stellenbosch, Republic of South Africa
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Find this author on ADS search
  • Find this author on Agricola
  • Search for this author on this site
H. P. Ruffner
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Find this author on ADS search
  • Find this author on Agricola
  • Search for this author on this site
C. G. Volschenk
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Find this author on ADS search
  • Find this author on Agricola
  • Search for this author on this site
D. J. Le Roux
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Find this author on ADS search
  • Find this author on Agricola
  • Search for this author on this site
  • Article
  • Info & Metrics
  • PDF
Loading

Abstract

Vitis vinifera L. cv. Cabernet Sauvignon/99 Richter was grown under field conditions. The effect of partial defoliation (33%) in the lower half of the canopy at berry set stage, and thereafter at pea-size and veraison, respectively, on root development, distribution, and composition as well as on canopy efficiency, yield, grape composition, and wine quality was investigated. Defoliation evidently stimulated occurrence of fine and extension roots, which may have increased the absorptive capacity of the root system. Root number decreased with increasing depth and roots occurred predominantly in the top 800 mm of the soil profile. Starch was the principal carbohydrate storage form in the roots, irrespective of root size. Starch synthesis appeared not affected by root age. Sucrose and organic acid patterns were similar. Citric and tartaric acids were the main organic acids in roots, followed by malic acid. Elevated sugar and organic acid levels were found in roots of treated vines. The results demonstrate that the remaining leaves of partially defoliated vines were able to sustain normal metabolic functions in the roots. Canopy density was efficiently reduced by partial defoliation, leading to increased light penetration, fruit exposure, and photosynthetic activity of mature and old leaves. Although partially defoliated vines had much less leaf area per gram fresh berry mass at ripeness, yield increased considerably with defoliation at pea-size and veraison. Root density, yield, and cane mass were related. Grape total soluble sugar content was unaffected, but titratable acidity increased and the pH of the must decreased with partial defoliation. Ostensible increases in wine constituents (anthocyanins, phenolics), color density, cultivar character intensity, and overall wine quality were found in wines from treated vines.

  • Vitis vinifera
  • partial defoliation
  • root growth
  • root composition
  • canopy efficiency
  • grape composition
  • wine quality
  • Received June 1994.
  • Copyright 1995 by the American Society for Enology and Viticulture

Sign in for ASEV members

ASEV Members, please sign in at ASEV to access the journal online.

Sign in for Institutional and Non-member Subscribers

Log in using your username and password

Forgot your user name or password?

Pay Per Article - You may access this article (from the computer you are currently using) for 2 day for US$10.00

Regain Access - You can regain access to a recent Pay per Article purchase if your access period has not yet expired.

Forgot your user name or password?

PreviousNext
Back to top

Vol 46 Issue 3

  • Table of Contents
  • Index by author
View full PDF
Email Article

Thank you for your interest in spreading the word on AJEV.

NOTE: We only request your email address so that the person you are recommending the page to knows that you wanted them to see it, and that it is not junk mail. We do not capture any email address.

Enter multiple addresses on separate lines or separate them with commas.
Partial Defoliation of Vitis vinifera L. cv. Cabernet Sauvignon/99 Richter: Effect on Root Growth, Canopy Efficiency; Grape Composition, and Wine Quality
(Your Name) has forwarded a page to you from AJEV
(Your Name) thought you would like to read this article from the American Journal of Enology and Viticulture.
CAPTCHA
This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.
Citation Tools
You have accessRestricted access
Partial Defoliation of Vitis vinifera L. cv. Cabernet Sauvignon/99 Richter: Effect on Root Growth, Canopy Efficiency; Grape Composition, and Wine Quality
J. J. Hunter, H. P. Ruffner, C. G. Volschenk, D. J. Le Roux
Am J Enol Vitic.  1995  46: 306-314  ; DOI: 10.5344/ajev.1995.46.3.306
J. J. Hunter
Plant Physiologist, Plant Physiologist and Agricultural Research Technician, respectively, Nietvoorbij Institute for Viticulture and Oenology, Private Bag X5026, 7599 Stellenbosch, Republic of South Africa
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
H. P. Ruffner
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
C. G. Volschenk
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
D. J. Le Roux
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site

Citation Manager Formats

  • BibTeX
  • Bookends
  • EasyBib
  • EndNote (tagged)
  • EndNote 8 (xml)
  • Medlars
  • Mendeley
  • Papers
  • RefWorks Tagged
  • Ref Manager
  • RIS
  • Zotero

Share
You have accessRestricted access
Partial Defoliation of Vitis vinifera L. cv. Cabernet Sauvignon/99 Richter: Effect on Root Growth, Canopy Efficiency; Grape Composition, and Wine Quality
J. J. Hunter, H. P. Ruffner, C. G. Volschenk, D. J. Le Roux
Am J Enol Vitic.  1995  46: 306-314  ; DOI: 10.5344/ajev.1995.46.3.306
J. J. Hunter
Plant Physiologist, Plant Physiologist and Agricultural Research Technician, respectively, Nietvoorbij Institute for Viticulture and Oenology, Private Bag X5026, 7599 Stellenbosch, Republic of South Africa
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
H. P. Ruffner
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
C. G. Volschenk
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
D. J. Le Roux
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
del.icio.us logo Digg logo Reddit logo Twitter logo CiteULike logo Facebook logo Google logo Mendeley logo
  • Tweet Widget
  • Facebook Like
  • Google Plus One
Save to my folders

Jump to section

  • Article
  • Info & Metrics
  • PDF

Related Articles

Cited By...

More from this TOC section

  • Effect of Winery Yeast Lees on Touriga Nacional Red Wine Color and Tannin Evolution
  • Predicting Berry Quality Attributes in cv. Xarel·lo Rain-Fed Vineyards Using Narrow-Band Reflectance-Based Indices
  • Impact of Exogenous Abscisic Acid on Vine Physiology and Grape Composition of Cabernet Sauvignon
Show more Article

Similar Articles

AJEV Content

  • Current Volume
  • Archive
  • Best Papers
  • ASEV National Conference Technical Abstracts
  • Print on Demand
  • Print on Demand

Information For

  • Authors
  • Open Access/Subscription Publishing
  • Submission
  • Subscribers
  • Permissions and Reproductions
  • Advertisers

Other

  • Home
  • About Us
  • Feedback
  • Help
  • Alerts
  • Catalyst
  • ASEV
asev.org

© 2023 American Society for Enology and Viticulture.  ISSN 0002-9254.

Powered by HighWire