Physiological Responses of Two Olive Cultivars to Salt Stress

被引：9

作者：

Boussadia, Olfa ^{[1
]}

Zgallai, Hatem ^{[2
]}

Mzid, Nada ^{[3
]}

Zaabar, Rihem ^{[1
]}

Braham, Mohamed ^{[1
]}

Doupis, Georgios ^{[4
]}

Koubouris, Georgios ^{[4
]}

机构：

[1] Olive Inst, Ibn Khaldoun BP 14, Sousse 4061, Tunisia

[2] Nat Inst Agron Res Tunisia, Rue Hedi Karray, Tunis 1004, Tunisia

[3] Univ Tuscia, Dept Agr Forestry & Nat DAFNE, I-01100 Viterbo, Italy

[4] Hellen Agr Org DIMITRA, Inst Olive Tree Subtrop Crops & Viticulture, Lab Olive Cultivat, Leoforos Karamanli 167, Iraklion 73134, Greece

来源：

PLANTS-BASEL | 2023年 / 12卷 / 10期

关键词：

antioxidant enzymes; climate change; K+/Na+ ratio; Olea europaea L; photosynthesis; plant phenotyping; OLEA-EUROPAEA L; SALINITY STRESS; GAS-EXCHANGE; OXIDATIVE DAMAGE; LEAF DEVELOPMENT; ION CONTENT; TOLERANCE; PHOTOSYNTHESIS; GROWTH; LEAVES;

D O I：

10.3390/plants12101926

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

The olive tree (Olea europaea L.) is the main fruit tree in most of the arid and semi-arid regions of Tunisia, which is where the problem of salinity is more pronounced. Salinity is one of the main factors that affects the productivity of olive trees, so the objective of this experiment was to study the effects of salinity on the photosynthesis, water relations, mineral status, and enzymatic activity of two cultivars of Olea europaea L., 'Chemlali' and 'Koroneiki'. The trial was conducted under controlled conditions in a greenhouse for a period of 49 days and included two treatments: T0 control and T100 (irrigation with 100 mM of NaCl solution). Under salinity stress, the photosynthesis, stomatal conductance, and leaves of both cultivars were negatively affected. 'Chemlali' showed greater tolerance to NaCl salinity, based on a progressive decrease in osmotic potential (?p) followed by a progressive and synchronous decrease in gs, without a comparable decrease in photosynthesis. The water use efficiency (WUE) improved as a result. In addition, the K+/Na+ ratio in 'Chemlali' rose. This appears to be crucial for managing stress. Conversely, enzymatic activity showed an accumulation of glutathione peroxidase (GPX) in stressed plants. The catalase (CAT) and ascorbate peroxidase (APX) content decreased in both stressed varieties. It can be concluded that the cultivar 'Koroneiki' is more susceptible to salt stress than the cultivar 'Chemlali', because the accumulation of GPX and the decreases in CAT and APX were more pronounced in this cultivar.

引用

页数：12