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Effect of summer pruning on some fruit quality traitsin Hayward kiwifruit

Published online by Cambridge University Press:  10 July 2013

Gregorio Gullo ,
Valentino Branca ,
Agostino Dattola ,
Rocco Zappia  and
Paolo Inglese
Gregorio Gullo*
Affiliation:
Dep. AG.R.A.R.I.A., Univ. Reggio Calabria, Feo di Vito, 89124 Reggio Calabria, Italy. ggullo@unirc.it
Valentino Branca
Affiliation:
Dep. AG.R.A.R.I.A., Univ. Reggio Calabria, Feo di Vito, 89124 Reggio Calabria, Italy. ggullo@unirc.it
Agostino Dattola
Affiliation:
Dep. AG.R.A.R.I.A., Univ. Reggio Calabria, Feo di Vito, 89124 Reggio Calabria, Italy. ggullo@unirc.it
Rocco Zappia
Affiliation:
Dep. AG.R.A.R.I.A., Univ. Reggio Calabria, Feo di Vito, 89124 Reggio Calabria, Italy. ggullo@unirc.it
Paolo Inglese
Affiliation:
Dep. Agric For Sci, Univ. Palermo, Viale delle Scienze 90128PalermoItaly
*
* Correspondence and reprints
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Abstract

Introduction. The aim of ourstudy was to analyze the effect of various levels of light availabilityin the fruit microenvironment (induced by summer pruning) on somefruit quality traits. Materials and methods. Two levelsof summer pruning were set: removal of either 30% or 60% of thecanopy leaf area. These treatments were compared with the control(unpruned vines). Two canopy layers (upper and lower) were identifiedin each treatment and in the control vines. At harvest, yield percane and per shoot was recorded in the two canopy layers; fruitfresh weight, flesh firmness, total soluble solid content and totaltitratable acidity were measured. Fruit Total Antioxidant Capacity (TAC)and Total Polyphenols (TPH) were determined at kiwifruit harvestand post-harvest (60 days after storage at 1 °C) in relation totheir position within the canopy (layer) and to the pruning treatmentapplied. Results. Removing 60% of the canopy leaf areainduced higher titratable acidity and flesh firmness of kiwifruitsat harvest; it reduced fruit weight and crop yield, but increasedTAC and TPH compared with kiwifruits of control. Removing 30% leaf areadid not reduce mean fruit weight and crop yield; it increased TACand TPH at harvest by 20%. Post-harvest TAC and TPH evolution didnot differ among treatments. Discussion and conclusion.Pergola-trained kiwifruit vines showed good performances in termsof crop yield and fruit quality when summer pruning reduced the LeafArea Index (LAI) to 3. More intense pruning resulted in a significantincrease in fruit TAC, but reduced fruit weight and crop yield,and delayed softening of pulp.

Keywords

ItalyActinidia deliciosacultivationdefoliationleaf area indexfruitsqualityantioxidantspolyphenolsItalieActinidia deliciosapratique culturaledefolitionindice de surface foliairequalitéantioxydantpolyphénolItaliaActinidia deliciosacultivodefoliacióníndice de superficie foliarfrutoscalidadantioxidantespolyfenoles
Type
Original article
Information
Fruits , Volume 68 , Issue 4 , July 2013 , pp. 315 - 322
Copyright
© 2013 Cirad/EDP Sciences

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