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Article

Effect of Shoot Number on Potted Grapevines: II. Dry Matter Accumulation and Partitioning

D. P. Miller, G. S. Howell, J. A. Flore
Am J Enol Vitic.  1996  47: 251-256  ; DOI: 10.5344/ajev.1996.47.3.251
D. P. Miller
Department of Horticulture, Michigan State University, East Lansing, MI 48824-1325.
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G. S. Howell
Department of Horticulture, Michigan State University, East Lansing, MI 48824-1325.
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J. A. Flore
Department of Horticulture, Michigan State University, East Lansing, MI 48824-1325.
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Abstract

Potted, one-year old Chambourcin grapevines were grown with one, three, or six shoots in the absence of fruit to determine the impact of increasing early-season leaf area on dry weight accumulation throughout the growing season. No fruit was retained so the role of vegetative sinks could be more carefully studied. Very few differences in dry weight were found for various organs (roots, trunks, shoots, and leaves) among the three treatments. Six-shoot vines had greater shoot weight just after bud burst, but at veraison and harvest, there was an inverse, linear relationship between shoot number and shoot dry weight. Three- and six-shoot vines had greater leaf and total canopy dry weights (leaves + shoots) at harvest only. Total plant dry weight was positively related to shoot number at harvest with three- and six-shoot vines having about 20% greater dry weight than one-shoot vines. No differences were detected in vine dry weight at any other time during the growing season. While dry weight differences were not large, increasing shoot numbers affected canopy morphology. Specific leaf and shoot weights decreased as shoot numbers increased, but leaf area per unit shoot weight increased. Additionally, the ratio of cane fresh weight to perennial storage tissues was inversely related to shoot number. This supports the hypothesis that cane fresh weights are of questionable value when used to estimate the cropping capacity of minimally pruned vines.

  • carbohydrates
  • source/sink relations
  • growth flush
  • Received April 1995.
  • Copyright 1996 by the American Society for Enology and Viticulture

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You have accessRestricted access
Effect of Shoot Number on Potted Grapevines: II. Dry Matter Accumulation and Partitioning
D. P. Miller, G. S. Howell, J. A. Flore
Am J Enol Vitic.  1996  47: 251-256  ; DOI: 10.5344/ajev.1996.47.3.251
D. P. Miller
Department of Horticulture, Michigan State University, East Lansing, MI 48824-1325.
  • Find this author on Google Scholar
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G. S. Howell
Department of Horticulture, Michigan State University, East Lansing, MI 48824-1325.
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J. A. Flore
Department of Horticulture, Michigan State University, East Lansing, MI 48824-1325.
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Effect of Shoot Number on Potted Grapevines: II. Dry Matter Accumulation and Partitioning
D. P. Miller, G. S. Howell, J. A. Flore
Am J Enol Vitic.  1996  47: 251-256  ; DOI: 10.5344/ajev.1996.47.3.251
D. P. Miller
Department of Horticulture, Michigan State University, East Lansing, MI 48824-1325.
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
G. S. Howell
Department of Horticulture, Michigan State University, East Lansing, MI 48824-1325.
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  • Find this author on PubMed
  • Search for this author on this site
J. A. Flore
Department of Horticulture, Michigan State University, East Lansing, MI 48824-1325.
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
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