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Whole-Canopy Source-Sink Balance at Bloom Dictates Fruit Set in cv. Pinot noir Subjected to Early Leaf Removal

Tommaso Frioni, Dana Acimovic, Joshua VanderWeide, Sergio Tombesi, Alberto Palliotti, Matteo Gatti, Stefano Poni, Paolo Sabbatini
Am J Enol Vitic. October 2019 70: 411-419; published ahead of print July 16, 2019 ; DOI: 10.5344/ajev.2019.19004
Tommaso Frioni
Department of Sustainable Crop Production, Università Cattolica del Sacro Cuore, Via Emilia Parmense, 84, 29122 Piacenza, Italy
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Dana Acimovic
Cornell University, Hudson Valley Research Laboratory, Highland, NY 12528
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Joshua VanderWeide
Department of Horticulture, Michigan State University, East Lansing, MI 48824
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Sergio Tombesi
Department of Sustainable Crop Production, Università Cattolica del Sacro Cuore, Via Emilia Parmense, 84, 29122 Piacenza, Italy
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Alberto Palliotti
Dipar-timento di Scienze Agrarie, Alimentari e Ambientali, Università di Perugia, Borgo XX 7 Giugno 74, 06128 Perugia, Italy
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Matteo Gatti
Department of Sustainable Crop Production, Università Cattolica del Sacro Cuore, Via Emilia Parmense, 84, 29122 Piacenza, Italy
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Stefano Poni
Department of Sustainable Crop Production, Università Cattolica del Sacro Cuore, Via Emilia Parmense, 84, 29122 Piacenza, Italy
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Paolo Sabbatini
Department of Horticulture, Michigan State University, East Lansing, MI 48824
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  • For correspondence: sabbatin@msu.edu
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Abstract

Severe prebloom leaf removal dramatically affects the source-sink balance in grapevines, leading to a reduction in fruit set. In this study, carried on for two consecutive years, the impact of defoliation at bloom was evaluated with the objective to assess the capacity of developing inflorescences to attract photosynthates from adjacent shoots subjected to varying source/sink manipulations. In Pinot noir trained to a bilateral cordon, untreated vines (UT-UT) were compared to a treatment where shoots on one-half of the vines were subjected to the removal of 10 basal leaves at bloom (UT-LR). Another set of vines underwent sink removal (inflorescences and shoot apex) at bloom on half of the shoots by hand thinning (TFR-UT). A final treatment consisted of removing 10 basal leaves on half of the shoots and removing sinks on the other half of the canopy (TFR-LR). Following treatment application, shoot leaf area retained was ~40% of the total in UT-LR and TFR-LR. UT-LR reduced the whole canopy leaf area available per inflorescence by ~44% when compared to UT-UT. TFR-LR did not affect this balance. In UT-LR, fruit set was significantly reduced (-36% as compared to UT-UT), whereas it was unaffected by TFR-LR and TFR-UT. Independent of treatments, fruit set in both seasons was correlated with whole-canopy leaf area per inflorescence at bloom and not with the single shoot leaf area retained after early leaf removal.

  • fruit set
  • leaf removal
  • reproductive activity
  • translocation
  • Received January 2019.
  • Revision received March 2019.
  • Revision received April 2019.
  • Accepted June 2019.
  • ©2019 by the American Society for Enology and Viticulture
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Whole-Canopy Source-Sink Balance at Bloom Dictates Fruit Set in cv. Pinot noir Subjected to Early Leaf Removal
Tommaso Frioni, Dana Acimovic, Joshua VanderWeide, Sergio Tombesi, Alberto Palliotti, Matteo Gatti, Stefano Poni, Paolo Sabbatini
Am J Enol Vitic.  October 2019  70: 411-419;  published ahead of print July 16, 2019 ; DOI: 10.5344/ajev.2019.19004

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Whole-Canopy Source-Sink Balance at Bloom Dictates Fruit Set in cv. Pinot noir Subjected to Early Leaf Removal
Tommaso Frioni, Dana Acimovic, Joshua VanderWeide, Sergio Tombesi, Alberto Palliotti, Matteo Gatti, Stefano Poni, Paolo Sabbatini
Am J Enol Vitic.  October 2019  70: 411-419;  published ahead of print July 16, 2019 ; DOI: 10.5344/ajev.2019.19004
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