Abstract
Abstract A greenhouse experiment was performed in order to investigate the effects of different levels of water stress on leaf water potential (Ψ w ), stomatal resistance (r s ), protein content and chlorophyll (Chl) content of tomato plants ( Lycopersicon esculentum Mill. cv. Nikita). Water stress was induced by adding polyethylene glycol (PEG 6 000) to the nutrient solution to reduce the osmotic potential (Ψ s ). We investigated the behavior of anti‐oxidant enzymes, such as catalase (CAT) and superoxide dismutase (SOD), during the development of water stress. Moderate and severe water stress (i.e. Ψs= ‐0.51 and ‐1.22 MPa, respectively) caused a decrease in Ψ w for all treated (water‐stressed) plants compared with control plants, with the reduction being more pronounced for severely stressed plants. In addition, r s was significantly affected by the induced water stress and a decrease in leaf soluble proteins and Chl content was observed. Whereas CAT activity remained constant, SOD activity was increased in water‐stressed plants compared with unstressed plants. These results indicate the possible role of SOD as an anti‐oxidant protector system for plants under water stress conditions. Moreover, it suggests the possibility of using this enzyme as an additional screening criterion for detecting water stress in plants. (Managing editor: Ping He)
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Claims 8
Claim · model-written summary
Moderate and severe stress reduced tomato leaf water potential relative to controls, more under severe stress.
- Taxon
- tomato plants
Solanum lycopersicumt0 - Treatment
- Moderate and severe water stresse0
- Outcome
- Ψ we0
- Direction
- decreasee0
- Qualifier
- more pronounced for severely stressed plantse0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moderate and severe water stress (i.e. Ψs= ‐0.51 and ‐1.22 MPa, respectively) caused a decrease in Ψ w for all treated (water‐stressed) plants compared with control plants, with the reduction being more pronounced for severely stressed plants.”
t0“Tomato Plants”
Claim · model-written summary
Water stress significantly affected stomatal resistance without a stated direction.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Treatment
- induced water stresse0
- Outcome
- r se0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“r s was significantly affected by the induced water stress”
t0“Tomato Plants”
Claim · model-written summary
Water stress decreased leaf soluble protein content.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Treatment
- induced water stresse0
- Outcome
- leaf soluble proteinse0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In addition, r s was significantly affected by the induced water stress and a decrease in leaf soluble proteins and Chl content was observed”
t0“Tomato Plants”
Claim · model-written summary
Water stress decreased chlorophyll content.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Treatment
- induced water stresse0
- Outcome
- Chl contente0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In addition, r s was significantly affected by the induced water stress and a decrease in leaf soluble proteins and Chl content was observed”
t0“Tomato Plants”
Claim · model-written summary
Catalase activity remained constant under water stress.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Treatment
- water‐stressed plantse0
- Gene
- CATe0
- Outcome
- CAT activitye0
- Direction
- remained constante0
- Comparator
- unstressed plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Whereas CAT activity remained constant, SOD activity was increased in water‐stressed plants compared with unstressed plants.”
t0“Tomato Plants”
Claim · model-written summary
SOD activity increased in water-stressed relative to unstressed plants.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Treatment
- water‐stressed plantse0
- Gene
- SODe0
- Outcome
- SOD activitye0
- Direction
- increasede0
- Comparator
- unstressed plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Whereas CAT activity remained constant, SOD activity was increased in water‐stressed plants compared with unstressed plants.”
t0“Tomato Plants”
Claim · model-written summary
The authors suggest SOD may protect plants under water stress.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Gene
- SODe0
- Outcome
- anti‐oxidant protector systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These results indicate the possible role of SOD as an anti‐oxidant protector system for plants under water stress conditions.”
t0“Tomato Plants”
Claim · model-written summary
The authors suggest using SOD activity as a water-stress screening criterion.
- Taxon
- tomato plantsSolanum lycopersicumt0
- Outcome
- additional screening criterion for detecting water stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it suggests the possibility of using this enzyme as an additional screening criterion for detecting water stress in plants”
t0“Tomato Plants”
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