Abstract
Water use efficiency (WUE) is considered as a determinant of yield under stress and a component of crop drought resistance. Stomatal behavior regulates both transpiration rate and net assimilation and has been suggested to be crucial for improving crop WUE. In this work, a dynamic model was used to examine the impact of dynamic properties of stomata on WUE. The model includes sub-models of stomatal conductance dynamics, solute accumulation in the mesophyll, mesophyll water content, and water flow to the mesophyll. Using the instantaneous value of stomatal conductance, photosynthesis, and transpiration rate were simulated using a biochemical model and Penman-Monteith equation, respectively. The model was parameterized for a cucumber leaf and model outputs were evaluated using climatic data. Our simulations revealed that WUE was higher on a cloudy than a sunny day. Fast stomatal reaction to light decreased WUE during the period of increasing light (e.g., in the morning) by up to 10.2% and increased WUE during the period of decreasing light (afternoon) by up to 6.25%. Sensitivity of daily WUE to stomatal parameters and mesophyll conductance to CO2 was tested for sunny and cloudy days. Increasing mesophyll conductance to CO2 was more likely to increase WUE for all climatic conditions (up to 5.5% on the sunny day) than modifications of stomatal reaction speed to light and maximum stomatal conductance.
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Claims 4
Claim · model-written summary
Modeled water use efficiency was higher on cloudy than sunny days.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“WUE was higher on a cloudy than a sunny day”
e1“The model was parameterized for a cucumber leaf and model outputs were evaluated using climatic data. Our simulations revealed that WUE was higher on a cloudy than a sunny day. Fast stomatal reaction to light decreased WUE during the period of increasing light (e.g., in the morning) by up to 10.2% and increased WUE during the period of decreasing light (afternoon) by up to 6.25%”
Claim · model-written summary
Fast stomatal reaction to increasing light reduced modeled water use efficiency by up to 10.2%.
- Taxon
- cucumber
Cucumis sativuse1 - Treatment
- Fast stomatal reaction to lighte0
- Outcome
- WUEe0
- Direction
- decreasede0
- Value
- up to 10.2%e0
- Qualifier
- period of increasing lighte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fast stomatal reaction to light decreased WUE during the period of increasing light (e.g., in the morning) by up to 10.2%”
e1“The model was parameterized for a cucumber leaf and model outputs were evaluated using climatic data. Our simulations revealed that WUE was higher on a cloudy than a sunny day. Fast stomatal reaction to light decreased WUE during the period of increasing light (e.g., in the morning) by up to 10.2% and increased WUE during the period of decreasing light (afternoon) by up to 6.25%”
Claim · model-written summary
Fast stomatal reaction to decreasing light increased modeled water use efficiency by up to 6.25%.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- Fast stomatal reaction to lighte1
- Outcome
- WUEe0
- Direction
- increasede0
- Value
- up to 6.25%e0
- Qualifier
- period of decreasing lighte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased WUE during the period of decreasing light (afternoon) by up to 6.25%”
e1“The model was parameterized for a cucumber leaf and model outputs were evaluated using climatic data. Our simulations revealed that WUE was higher on a cloudy than a sunny day. Fast stomatal reaction to light decreased WUE during the period of increasing light (e.g., in the morning) by up to 10.2% and increased WUE during the period of decreasing light (afternoon) by up to 6.25%”
Claim · model-written summary
Increasing mesophyll CO2 conductance was more likely to increase modeled water use efficiency under all climates than changing stomatal speed or maximum conductance.
- Taxon
- cucumberCucumis sativuse1
- Treatment
- Increasing mesophyll conductance to CO2e0
- Outcome
- WUEe0
- Direction
- increasee0
- Value
- up to 5.5%e0
- Qualifier
- all climatic conditionse0
- Comparator
- modifications of stomatal reaction speed to light and maximum stomatal conductancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing mesophyll conductance to CO2 was more likely to increase WUE for all climatic conditions (up to 5.5% on the sunny day) than modifications of stomatal reaction speed to light and maximum stomatal conductance”
e1“The model was parameterized for a cucumber leaf and model outputs were evaluated using climatic data. Our simulations revealed that WUE was higher on a cloudy than a sunny day. Fast stomatal reaction to light decreased WUE during the period of increasing light (e.g., in the morning) by up to 10.2% and increased WUE during the period of decreasing light (afternoon) by up to 6.25%”
The same questions in other papers
co2 · physiology: water · Cucumis sativus (cucumber)Results agree
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light · physiology: water · Cucumis sativus (cucumber)Results agree
4 papers in the same direction as this paper
- positive
- positive
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1 paper more in this group
See all 5 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.