Antioxidant Adjustments of Olive Trees (Olea Europaea) under Field Stress Conditions

• Type: Article in International Scientific Journal
• Date: 2021

Authors

Araujo, M (Author) Other; Prada, J (Author) Other; Mariz Ponte, N (Author) Other; Santos, C (Author) FCUP; Pereira, JA (Author) Other; Pinto, DCGA (Author) Other; Silva, AMS (Author) Other; Dias, MC (Author) Other

Journal

Title: Plants

Vol. 10

Final page: 684

Publisher: MDPI

Indexing

ISI Web of Knowledge - 4 Citations

Scopus - 4 Citations

Other information

Authenticus ID: P-00T-RBN

DOI: 10.3390/plants10040684

Abstract (EN): 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 (O-2(center dot-)) 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 17