Please use this identifier to cite or link to this item: https://hdl.handle.net/10316/105352
Title: Antioxidant Adjustments of Olive Trees (Olea Europaea) under Field Stress Conditions
Authors: Araújo, Márcia 
Prada, João
Mariz-Ponte, Nuno
Santos, Conceição
Pereira, José Alberto 
Pinto, Diana C. G. A.
Silva, Artur M. S. 
Dias, Maria Celeste 
Keywords: climate change; flavonoids; secoiridoids; Olea europaea; rainfed olive groves; drought
Issue Date: 1-Apr-2021
Publisher: MDPI
Project: UI0183–UID/BIA/04004/2020 
UID/QUI/00062/2019 
UIDB/50006/2020 
CIMO UIDB/00690/2020 
SFRH/BD/116801/2016 
SFRH/BD/138187/2018 
SFRH/BPD/100865/2014 
Serial title, monograph or event: Plants
Volume: 10
Issue: 4
Abstract: Extreme climate events are increasingly frequent, and the 2017 summer was particularly critical in the Mediterranean region. Olive is one of the most important species of this region, and these climatic events represent a threat to this culture. However, it remains unclear how olive trees adjust the antioxidant enzymatic system and modulate the metabolite profile under field stress conditions. Leaves from two distinct adjacent areas of an olive orchard, one dry and the other hydrated, were harvested. Tree water status, oxidative stress, antioxidant enzymes, and phenolic and lipophilic metabolite profiles were analyzed. The environmental conditions of the 2017 summer caused a water deficit in olive trees of the dry area, and this low leaf water availability was correlated with the reduction of long-chain alkanes and fatty acids. Hydrogen peroxide (H2O2) and superoxide radical (O2•-) levels increased in the trees collected from the dry area, but lipid peroxidation did not augment. The antioxidant response was predominantly marked by guaiacol peroxidase (GPOX) activity that regulates the H2O2 harmful effect and by the action of flavonoids (luteolin-7-O-glucuronide) that may act as reactive oxygen species scavengers. Secoiridoids adjustments may also contribute to stress regulation. This work highlights for the first time the protective role of some metabolite in olive trees under field drought conditions.
URI: https://hdl.handle.net/10316/105352
ISSN: 2223-7747
DOI: 10.3390/plants10040684
Rights: openAccess
Appears in Collections:FCTUC Ciências da Vida - Artigos em Revistas Internacionais

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This item is licensed under a Creative Commons License Creative Commons