Abstract
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 (Ψπ) 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.
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Claims 7
Claim · model-written summary
NaCl salinity negatively affected photosynthesis and stomatal conductance in both olive cultivars.
- Taxon
- Olea europaea
Olea europaeae0 - Material
- ‘Chemlali’ and ‘Koroneiki’e0
- Treatment
- irrigation with 100 mM of NaCl solutione1
- Outcome
- photosynthesis, stomatal conductancee2
- Direction
- negatively affectede2
- Comparator
- T0 controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effects of salinity on the photosynthesis, water relations, mineral status, and enzymatic activity of two cultivars of Olea europaea L., ‘Chemlali’ and ‘Koroneiki’”
e1“included two treatments: T0 control and T100 (irrigation with 100 mM of NaCl solution)”
e2“Under salinity stress, the photosynthesis, stomatal conductance, and leaves of both cultivars were negatively affected”
Claim · model-written summary
Chemlali showed greater tolerance to NaCl salinity than Koroneiki, without a comparable decrease in photosynthesis.
- Taxon
- Olea europaeaOlea europaeae0
- Material
- ‘Chemlali’e3
- Outcome
- tolerance to NaCl salinitye3
- Direction
- greatere3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effects of salinity on the photosynthesis, water relations, mineral status, and enzymatic activity of two cultivars of Olea europaea L., ‘Chemlali’ and ‘Koroneiki’”
e3“‘Chemlali’ showed greater tolerance to NaCl salinity, based on a progressive decrease in osmotic potential (Ψπ) followed by a progressive and synchronous decrease in gs, without a comparable decrease in photosynthesis”
Claim · model-written summary
Salinity stress improved water use efficiency in olive trees.
- Taxon
- Olea europaeaOlea europaeae0
- Treatment
- salinity stresse2
- Outcome
- water use efficiency (WUE)e4
- Direction
- improvede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effects of salinity on the photosynthesis, water relations, mineral status, and enzymatic activity of two cultivars of Olea europaea L., ‘Chemlali’ and ‘Koroneiki’”
e2“Under salinity stress, the photosynthesis, stomatal conductance, and leaves of both cultivars were negatively affected”
e4“The water use efficiency (WUE) improved as a result”
Claim · model-written summary
The K+/Na+ ratio rose in Chemlali under salinity.
- Taxon
- Olea europaeaOlea europaeae0
- Material
- ‘Chemlali’e5
- Outcome
- K+/Na+ ratioe5
- Direction
- rosee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effects of salinity on the photosynthesis, water relations, mineral status, and enzymatic activity of two cultivars of Olea europaea L., ‘Chemlali’ and ‘Koroneiki’”
e5“the K+/Na+ ratio in ‘Chemlali’ rose”
Claim · model-written summary
Glutathione peroxidase (GPX) accumulated in stressed olive plants.
- Taxon
- Olea europaeaOlea europaeae0
- Treatment
- stressed plantse6
- Outcome
- glutathione peroxidase (GPX)e6
- Direction
- accumulatione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effects of salinity on the photosynthesis, water relations, mineral status, and enzymatic activity of two cultivars of Olea europaea L., ‘Chemlali’ and ‘Koroneiki’”
e6“enzymatic activity showed an accumulation of glutathione peroxidase (GPX) in stressed plants”
Claim · model-written summary
Catalase (CAT) and ascorbate peroxidase (APX) content decreased in both stressed olive cultivars.
- Taxon
- Olea europaeaOlea europaeae0
- Treatment
- stressed varietiese7
- Outcome
- The catalase (CAT) and ascorbate peroxidase (APX) contente7
- Direction
- decreasede7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effects of salinity on the photosynthesis, water relations, mineral status, and enzymatic activity of two cultivars of Olea europaea L., ‘Chemlali’ and ‘Koroneiki’”
e7“The catalase (CAT) and ascorbate peroxidase (APX) content decreased in both stressed varieties”
Claim · model-written summary
Koroneiki is more susceptible to salt stress than Chemlali.
- Taxon
- Olea europaeaOlea europaeae0
- Material
- ‘Koroneiki’e7
- Outcome
- susceptible to salt stresse7
- Direction
- more susceptiblee7
- Comparator
- ‘Chemlali’e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effects of salinity on the photosynthesis, water relations, mineral status, and enzymatic activity of two cultivars of Olea europaea L., ‘Chemlali’ and ‘Koroneiki’”
e7“the cultivar ‘Koroneiki’ is more susceptible to salt stress than the cultivar ‘Chemlali’”
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