Abstract
Understanding the physiological responses of crops to drought is important for ensuring sustained crop productivity under climate change, which is expected to exacerbate the frequency and intensity of periods of drought. Drought responses involve multiple traits, and the correlations between these traits are poorly understood. Using a variety of techniques, we estimated the changes in gas exchange, leaf hydraulic conductance, and leaf turgor in rice (Oryza sativa) in response to both short- and long-term soil drought. We performed a photosynthetic limitation analysis to quantify the contributions of each limiting factor to the resultant overall decrease in photosynthesis during drought. Biomass, leaf area, and leaf width significantly decreased during the 2-week drought treatment, but leaf mass per area and leaf vein density increased. Light-saturated photosynthetic rate declined dramatically during soil drought, mainly due to the decrease in stomatal conductance (gs) and mesophyll conductance (gm). Stomatal modeling suggested that the decline in leaf hydraulic conductance explained most of the decrease in stomatal closure during the drought treatment, and may also trigger the drought-related decrease of stomatal conductance and mesophyll conductance. The results of this study provide insight into the regulation of carbon assimilation under drought conditions.
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Claims 7
Claim · model-written summary
Biomass, leaf area and leaf width of rice decreased significantly during a 2-week drought treatment.
- Taxon
- rice
Oryza sativat0 - Treatment
- 2-week drought treatmente1
- Outcome
- Biomass, leaf area, and leaf widthe1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“during drought in rice”
e1“Biomass, leaf area, and leaf width significantly decreased during the 2-week drought treatment, but leaf mass per area and leaf vein density increased”
Claim · model-written summary
Leaf mass per area and leaf vein density of rice increased during a 2-week drought treatment.
- Taxon
- riceOryza sativat0
- Treatment
- 2-week drought treatmente1
- Outcome
- leaf mass per area and leaf vein densitye1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“during drought in rice”
e1“Biomass, leaf area, and leaf width significantly decreased during the 2-week drought treatment, but leaf mass per area and leaf vein density increased”
Claim · model-written summary
Light-saturated photosynthetic rate of rice declined during soil drought.
- Taxon
- riceOryza sativat0
- Treatment
- soil droughte2
- Outcome
- Light-saturated photosynthetic ratee2
- Direction
- declinede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“during drought in rice”
e2“Light-saturated photosynthetic rate declined dramatically during soil drought, mainly due to the decrease in stomatal conductance (gs) and mesophyll conductance (gm)”
Claim · model-written summary
Stomatal conductance and mesophyll conductance of rice decreased during soil drought.
- Taxon
- riceOryza sativat0
- Treatment
- soil droughte2
- Outcome
- stomatal conductance (gs) and mesophyll conductance (gm)e2
- Direction
- decreasee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“during drought in rice”
e2“Light-saturated photosynthetic rate declined dramatically during soil drought, mainly due to the decrease in stomatal conductance (gs) and mesophyll conductance (gm)”
Claim · model-written summary
The decrease in stomatal and mesophyll conductance was the main cause of the drop in light-saturated photosynthesis in rice.
- Taxon
- riceOryza sativat0
- Outcome
- Light-saturated photosynthetic ratee2
- Qualifier
- the decrease in stomatal conductance (gs) and mesophyll conductance (gm)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“during drought in rice”
e2“Light-saturated photosynthetic rate declined dramatically during soil drought, mainly due to the decrease in stomatal conductance (gs) and mesophyll conductance (gm)”
Claim · model-written summary
Stomatal modelling suggested that the decline in leaf hydraulic conductance explained most of the stomatal closure in rice.
- Taxon
- riceOryza sativat0
- Outcome
- stomatal closuree3
- Qualifier
- the decline in leaf hydraulic conductancee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“during drought in rice”
e3“Stomatal modeling suggested that the decline in leaf hydraulic conductance explained most of the decrease in stomatal closure during the drought treatment, and may also trigger the drought-related decrease of stomatal conductance and mesophyll conductance”
Claim · model-written summary
The decline in leaf hydraulic conductance may trigger the drought-related decrease of stomatal and mesophyll conductance in rice.
- Taxon
- riceOryza sativat0
- Outcome
- stomatal conductance and mesophyll conductancee3
- Qualifier
- the decline in leaf hydraulic conductancee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“during drought in rice”
e3“Stomatal modeling suggested that the decline in leaf hydraulic conductance explained most of the decrease in stomatal closure during the drought treatment, and may also trigger the drought-related decrease of stomatal conductance and mesophyll conductance”
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