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

被引:14
作者
Araujo, Marcia [1 ,2 ,3 ]
Prada, Joao [2 ]
Mariz-Ponte, Nuno [2 ]
Santos, Conceicao [2 ]
Pereira, Jose Alberto [4 ]
Pinto, Diana C. G. A. [5 ]
Silva, Artur M. S. [5 ]
Dias, Maria Celeste [1 ,5 ]
机构
[1] Univ Coimbra, Dept Life Sci, Ctr Funct Ecol, Calcada Martim Freitas, P-3000456 Coimbra, Portugal
[2] Univ Porto, Dept Biol, Integrated Biol & Biotechnol Lab, LAQV REQUIMTE,Fac Sci, Rua Campo Alegre, P-4169007 Porto, Portugal
[3] Univ Tras os Montes & Alto Douro, Ctr Res & Technol Agroenvironm & Biol Sci, P-5001801 Vila Real, Portugal
[4] Inst Politecn Braganca, Ctr Invest Montanha CIMO, ESA, Campus Santa Apolonia, P-5300253 Braganca, Portugal
[5] Univ Aveiro, Dept Chem, LAQV REQUIMTE, P-3810193 Aveiro, Portugal
来源
PLANTS-BASEL | 2021年 / 10卷 / 04期
关键词
climate change; flavonoids; secoiridoids; Olea europaea; rainfed olive groves; drought; OXIDATIVE STRESS; PHENOLIC-COMPOUNDS; HYDROGEN-PEROXIDE; DROUGHT TOLERANCE; WATER-DEFICIT; GAS-EXCHANGE; LEAVES; L; FLAVONOIDS; PLANTS;
D O I
10.3390/plants10040684
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
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.
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页数:17
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