Abstract
Abstract Stomatal conductance ( g s ) affects water use efficiency (WUE) through coordinating photosynthesis and transpiration and is regulated by chemical and/or hydraulic signals. However, the regulation mechanism of g s of tomato leaves has not been fully explored under combined water and salt stress. Here, we set up four salt treatments and two water treatments in a climate greenhouse and measured stomatal morphologies and conductance and other photosynthesis parameters. Water and salt stress reduced stomatal length ( SL ), width, perimeter, area ( a max ), density ( SD ), and the maximum stomatal conductance ( g smax ). Water and salt stress had a separate weakening effect on net photosynthetic rate ( A ) and transpiration rate but interactively reduced g s . The contents of abscisic acid (ABA) and Na + in tomato leaves increased with the NaCl concentration, while leaf water potential (Ψ l ) and chlorophyll content decreased. Under full irrigation, g smax was coordinated by SD and a max , and g s by ABA content under salt stress. Under water and salt combined stress, g smax was affected by a max , and g s was coordinated with ABA and Ψ l . The decrease of A was caused by both a reduction of chlorophyll content and g s under water and salt stress. Intrinsic WUE did not reduce under full irrigation or mild to moderate salt stress but decreased under a combination of water and severe salt stress, indicating that the leaves of the tested tomato cultivar performed better under moderate salt stress. Collectively, these results can provide useful insights for the efficient management of water and salt to adapt to drought and high salt environments.
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Claims 13
Claim · model-written summary
Water and salt stress reduced stomatal dimensions, density and maximum conductance.
- Taxon
- tomato
Solanum lycopersicumt0 - Treatment
- Water and salt stresse0
- Outcome
- stomatal length ( SL ), width, perimetere0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water and salt stress reduced stomatal length ( SL ), width, perimeter, area ( a max ), density ( SD ), and the maximum stomatal conductance ( g smax )”
t0“tomato leaves”
Claim · model-written summary
Water and salt stress reduced stomatal area, density and maximum conductance.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Water and salt stresse0
- Outcome
- area ( a max ), density ( SD ), and the maximum stomatal conductance ( g smax )e0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water and salt stress reduced stomatal length ( SL ), width, perimeter, area ( a max ), density ( SD ), and the maximum stomatal conductance ( g smax )”
t0“tomato leaves”
Claim · model-written summary
Water and salt stress separately weakened photosynthetic and transpiration rates.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Water and salt stresse0
- Outcome
- net photosynthetic rate ( A ) and transpiration ratee0
- Direction
- weakeninge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water and salt stress had a separate weakening effect on net photosynthetic rate ( A ) and transpiration rate”
t0“tomato leaves”
Claim · model-written summary
Combined water and salt stress interactively reduced stomatal conductance.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Water and salt stresse0
- Outcome
- g se0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water and salt stress had a separate weakening effect on net photosynthetic rate ( A ) and transpiration rate but interactively reduced g s”
t0“tomato leaves”
Claim · model-written summary
Leaf ABA and sodium contents increased with NaCl concentration.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- NaCl concentratione0
- Outcome
- abscisic acid (ABA) and Na + in tomato leavese0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The contents of abscisic acid (ABA) and Na + in tomato leaves increased with the NaCl concentration”
Claim · model-written summary
Leaf water potential and chlorophyll content decreased with NaCl concentration.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- NaCl concentratione0
- Outcome
- leaf water potential (Ψ l ) and chlorophyll contente0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The contents of abscisic acid (ABA) and Na + in tomato leaves increased with the NaCl concentration, while leaf water potential (Ψ l ) and chlorophyll content decreased”
Claim · model-written summary
Under full irrigation, stomatal maximum conductance was coordinated by stomatal density and area.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- tomato leavest0
- Outcome
- g smaxe0
- Qualifier
- Under full irrigatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under full irrigation, g smax was coordinated by SD and a max”
t0“tomato leaves”
Claim · model-written summary
Under full irrigation and salt stress, stomatal conductance was coordinated by ABA content.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- tomato leavest0
- Outcome
- g se0
- Qualifier
- under salt stresse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“g s by ABA content under salt stress”
t0“tomato leaves”
Claim · model-written summary
Under combined water and salt stress, maximum stomatal conductance was affected by stomatal area.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- tomato leavest0
- Outcome
- g smaxe0
- Qualifier
- Under water and salt combined stresse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under water and salt combined stress, g smax was affected by a max”
t0“tomato leaves”
Claim · model-written summary
Under combined water and salt stress, stomatal conductance was coordinated with ABA and leaf water potential.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- tomato leavest0
- Outcome
- g se0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“g s was coordinated with ABA and Ψ l”
t0“tomato leaves”
Claim · model-written summary
Reduced chlorophyll content and stomatal conductance caused the decrease in net photosynthetic rate under water and salt stress.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- Ae0
- Direction
- decreasee0
- Qualifier
- a reduction of chlorophyll content and g se0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decrease of A was caused by both a reduction of chlorophyll content and g s under water and salt stress”
t0“tomato leaves”
Claim · model-written summary
Intrinsic water use efficiency did not decline under full irrigation or mild to moderate salt stress.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- mild to moderate salt stresse0
- Outcome
- Intrinsic WUEe0
- Direction
- did not reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Intrinsic WUE did not reduce under full irrigation or mild to moderate salt stress”
t0“tomato leaves”
Claim · model-written summary
Combined water and severe salt stress decreased intrinsic water use efficiency.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- a combination of water and severe salt stresse0
- Outcome
- Intrinsic WUEe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Intrinsic WUE did not reduce under full irrigation or mild to moderate salt stress but decreased under a combination of water and severe salt stress”
t0“tomato leaves”
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