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Title: Fire Blight Management: Physiological Assessment of Cultural Control By Pruning in Pear Orchards
Authors: Mendes, Rafael J.
Mariz-Ponte, Nuno
Correia, Cristiana V.
Dias, Maria Celeste 
Sousa, Miguel Leão de
Tavares, Fernando
Santos, Conceição
Keywords: Erwinia amylovora; pear tree; photosynthesis; pruning; RuBisCO
Issue Date: 2020
Project: FCT SFRH/BD/133519/2017 
FCT SFRH/BD/138187/2018 
FCT SFRH/BPD/100865/2014 
Serial title, monograph or event: Agriculture
Volume: 66
Issue: 3
Abstract: The aim of this work was to evaluate the photosynthetic performance of Pear trees (cv. 'Rocha') infected with Erwinia amylovora, three months after suffering a pruning of infected branches (P-trees) compared with asymptomatic trees (C-trees) of the same orchard. Three months after pruning, P-trees looked healthy and were negative for the presence of E. amylovora. In September of 2018, fully expanded leaves of both P- and C- trees were sampled and analysed for photosynthetic parameters related to chlorophyll a fluorescence and gas exchange, alongside with pigments, total soluble sugars, starch, and ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) contents. No significant differences were found in chlorophyll and carotenoids levels, but anthocyanins significantly decreased in P-trees. Also, despite the maximum quantum yield (Fv/Fm) significantly decreased in P-trees, the effective quantum yield of the PSII was maintained, paralleled with no changes in gas exchange parameters (PN, gs, Ci, E, iWUE, PN/gs), nor in RuBisCO relative content. Finally, the maintenance of the levels of total soluble sugars and starch also supports that the photosynthetic performance of P-trees, three months after pruning, reached values similar to those of the C-trees, contributing to the normal development and ripening of the fruit. Data support that pruning represents a reliable control measure against this quarantine pathogen. This work is the first evaluation of pruning in fire blight management regarding carbon metabolism in P. communis trees.
ISSN: 1338-4376
DOI: 10.2478/agri-2020-0012
Rights: openAccess
Appears in Collections:I&D CFE - Artigos em Revistas Internacionais

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