Abstract
Salicylic acid (SA), a signalling molecule in plant-pathogen interactions induces stomatal closure in intact leaves and it has a direct control over stomatal movement by increasing the levels of reactive oxygen species (ROS) and nitric oxide (NO) in guard cells (GC). Stomatal closure on the abaxial epidermal peels of tomato leaves was induced at 10-7 and 10-3M SA but stomata remained open at 10-4M. At concentrations that reduced stomatal aperture, the ROS and NO levels were raised. The accumulation of ROS and NO could be prevented by specific scavengers, which were effective inhibitors of the SA-induced stomatal closure. In contrast with other plant species, the guard cells (GCs) of tomato did not show a long-lasting accumulation of ROS in the presence of 10-4M SA and their NO content decreased to below the control level, leading to stomatal opening. Increasing SA concentrations resulted in a significant decrease in the maximum and effective quantum yields of PSII photochemistry and in the photochemical quenching parameter of GCs. In the presence of 10-7 and 10-4M SA, the chloroplasts of GCs sustained a higher electron transport rate than in the presence of 10-3M, suggesting that the SA-induced inhibition of GC photosynthesis may affect stomatal closure at high SA concentrations.
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Claims 8
Claim · model-written summary
Salicylic acid at 10-7 and 10-3M induced stomatal closure.
- Taxon
- tomato
Solanum lycopersicume0 - Organ / stage
- abaxial epidermal peelse0
- Treatment
- 10-7 and 10-3M SAe0
- Outcome
- Stomatal closuree0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stomatal closure on the abaxial epidermal peels of tomato leaves was induced at 10-7 and 10-3M SA”
Claim · model-written summary
Stomata remained open at 10-4M SA.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- 10-4Me0
- Outcome
- stomata remained opene0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stomata remained open at 10-4M”
t0“tomato”
Claim · model-written summary
ROS and NO levels rose at SA concentrations that reduced aperture.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- concentrations that reduced stomatal aperturee0
- Outcome
- ROS and NO levelse0
- Direction
- raisede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At concentrations that reduced stomatal aperture, the ROS and NO levels were raised”
t0“tomato”
Claim · model-written summary
Specific scavengers prevented ROS and NO accumulation and inhibited SA-induced closure.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- specific scavengerse0
- Outcome
- accumulation of ROS and NOe0
- Direction
- preventede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The accumulation of ROS and NO could be prevented by specific scavengers, which were effective inhibitors of the SA-induced stomatal closure”
t0“tomato”
Claim · model-written summary
At 10-4M SA, tomato guard cells did not sustain ROS accumulation.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- guard cellse0
- Treatment
- 10-4M SAe0
- Outcome
- long-lasting accumulation of ROSe0
- Direction
- did not showe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the guard cells (GCs) of tomato did not show a long-lasting accumulation of ROS in the presence of 10-4M SA”
Claim · model-written summary
At 10-4M SA, NO content fell below control and stomata opened.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- 10-4M SAe1
- Outcome
- NO contente0
- Direction
- decreasede0
- Comparator
- control levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“their NO content decreased to below the control level, leading to stomatal opening”
e1“in the presence of 10-4M SA”
t0“tomato”
Claim · model-written summary
Increasing SA significantly decreased maximum and effective quantum yields and photochemical quenching.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Increasing SA concentrationse0
- Outcome
- maximum and effective quantum yields of PSII photochemistry and in the photochemical quenching parametere0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing SA concentrations resulted in a significant decrease in the maximum and effective quantum yields of PSII photochemistry and in the photochemical quenching parameter of GCs”
t0“tomato”
Claim · model-written summary
At 10-7 and 10-4M SA, guard cell electron transport was higher than at 10-3M.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- 10-7 and 10-4M SAe0
- Outcome
- electron transport ratee0
- Direction
- highere0
- Comparator
- 10-3Me0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the presence of 10-7 and 10-4M SA, the chloroplasts of GCs sustained a higher electron transport rate than in the presence of 10-3M”
t0“tomato”
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salicylic acid · physiology: gas exchange · Solanum lycopersicum (tomato)Results agree
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See all 15 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.