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Early Leaf Removal has a Larger Effect than Cluster Thinning on Grape Phenolic Composition in cv. Teran

Marijan Bubola, Paolo Sivilotti, Danijela Janjanin, Stefano Poni
Am J Enol Vitic. April 2017 68: 234-242; published ahead of print January 05, 2017 ; DOI: 10.5344/ajev.2016.16071
Marijan Bubola
Institute of Agriculture and Tourism, Karla Huguesa 8, 52440 Poreč, Croatia
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Paolo Sivilotti
Dipartimento di Scienze Agroalimentari, Ambientali e Animali, Università degli Studi di Udine, via delle Scienze 206, 33100 Udine, Italy
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Danijela Janjanin
Institute of Agriculture and Tourism, Karla Huguesa 8, 52440 Poreč, Croatia
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Stefano Poni
Dipartimento di Scienze delle Produzioni Vegetali Sostenibili, Area Frutticoltura e Viticoltura, Università Cattolica del Sacro Cuore, via Emilia Parmense 84, 29100 Piacenza, Italy
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  • For correspondence: stefano.poni@unicatt.it
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Abstract

This study aimed to assess the effects of early leaf removal (ELR) and cluster thinning (CT) on vegetative growth, yield components, and berry composition of Teran (Vitis vinifera L.) grown in the Istria region of Croatia. Both treatments were compared with an untreated control (UC) during the 2012 and 2013 growing seasons. ELR involved the removal of six basal leaves at the preflowering stage, while in CT, 35% of clusters were removed at the onset of veraison. Both ELR and CT resulted in lower yield per vine compared to UC (22 and 37% less, respectively), and in greater Brix at harvest (+1.3 and +1.0, respectively). The concentration of total phenolics in grapes increased by 19% in ELR and by 6% in CT compared to UC, while total anthocyanin concentrations increased only in ELR (+20% versus UC). Despite greater yield and a lower leaf area-to-yield ratio compared to CT, ELR achieved higher total anthocyanin and phenolic concentration, suggesting that ELR is more suitable than CT for the production of high-quality Teran grapes.

  • anthocyanins
  • canopy management
  • fruit exposure
  • leaf area
  • phenolic compounds
  • yield
  • ©2017 by the American Society for Enology and Viticulture
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Early Leaf Removal has a Larger Effect than Cluster Thinning on Grape Phenolic Composition in cv. Teran
Marijan Bubola, Paolo Sivilotti, Danijela Janjanin, Stefano Poni
Am J Enol Vitic.  April 2017  68: 234-242;  published ahead of print January 05, 2017 ; DOI: 10.5344/ajev.2016.16071

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Early Leaf Removal has a Larger Effect than Cluster Thinning on Grape Phenolic Composition in cv. Teran
Marijan Bubola, Paolo Sivilotti, Danijela Janjanin, Stefano Poni
Am J Enol Vitic.  April 2017  68: 234-242;  published ahead of print January 05, 2017 ; DOI: 10.5344/ajev.2016.16071
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