Abstract
By using open top chamber,a field experiment was conducted to study the effects of elevated ozone concentration on the diurnal change of winter wheat photosynthesis at milking stage.At 13:00-15:00,the field environmental variables (photosynthetic active radiation,chamber temperature,and vapor pressure difference) were the menace to the winter wheat photosynthesis.Comparing with the control,fumigation with 100 and 150 nl·L-1 of ozone led to the decrease of net photosynthetic rate by 6.3% and 11.1%,respectively (P0.05).In treatment 100 nl·L-1 of ozone,the stoma limit value,transpiration rate,stomatal conductance,and water use efficiency had a change trend basically in accordance with that in control;whereas in treatment 150 nl·L-1 of ozone,the transpiration rate and stomatal conductance increased significantly before 11:00,but the water use efficiency was in adverse.At 13:00-15:00,the water use efficiency increased significantly in both cases.The above evidences indicated that under no environmental stress,the decrease of net photosynthetic rate could be attributed to the stomatal and non-stomatal limitation in treatments 100 and 150 nl·L-1 of ozone,respectively.Under stressed environment,both 100 and 150 nl·L-1 of ozone improved the winter wheat water use efficiency significantly,moreover,150 nl·L-1 of ozone induced a significant increase of intercellular CO2 use efficiency.
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Claims 12
Claim · model-written summary
Environmental variables threatened winter wheat photosynthesis at 13:00-15:00.
- Taxon
- winter wheat
Triticum aestivume0 - Outcome
- winter wheat photosynthesise0
- Qualifier
- 13:00-15:00e0
- Setting
- fielde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 13:00-15:00,the field environmental variables (photosynthetic active radiation,chamber temperature,and vapor pressure difference) were the menace to the winter wheat photosynthesis.”
Claim · model-written summary
Ozone at 100 nl·L-1 decreased net photosynthetic rate by 6.3% versus control.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- 100 nl·L-1 of ozonee1
- Outcome
- net photosynthetic ratee0
- Direction
- decreasee0
- Value
- 6.3%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Comparing with the control,fumigation with 100 and 150 nl·L-1 of ozone led to the decrease of net photosynthetic rate by 6.3% and 11.1%,respectively (P0.05).”
t0“winter wheat”
e1“In treatment 100 nl·L-1 of ozone,the stoma limit value,transpiration rate,stomatal conductance,and water use efficiency had a change trend basically in accordance with that in control”
Claim · model-written summary
Ozone at 150 nl·L-1 decreased net photosynthetic rate by 11.1% versus control.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- 150 nl·L-1 of ozonee0
- Outcome
- net photosynthetic ratee0
- Direction
- decreasee0
- Value
- 11.1%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Comparing with the control,fumigation with 100 and 150 nl·L-1 of ozone led to the decrease of net photosynthetic rate by 6.3% and 11.1%,respectively (P0.05).”
t0“winter wheat”
Claim · model-written summary
At 100 nl·L-1 ozone, stomatal limitation, transpiration, conductance and water use efficiency followed control trends.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- 100 nl·L-1 of ozonee0
- Outcome
- stoma limit value,transpiration rate,stomatal conductance,and water use efficiencye0
- Direction
- in accordance withe0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In treatment 100 nl·L-1 of ozone,the stoma limit value,transpiration rate,stomatal conductance,and water use efficiency had a change trend basically in accordance with that in control”
t0“winter wheat”
Claim · model-written summary
At 150 nl·L-1 ozone, transpiration rate and stomatal conductance increased before 11:00.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- 150 nl·L-1 of ozonee0
- Outcome
- transpiration rate and stomatal conductancee0
- Direction
- increasede0
- Qualifier
- before 11:00e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in treatment 150 nl·L-1 of ozone,the transpiration rate and stomatal conductance increased significantly before 11:00”
t0“winter wheat”
Claim · model-written summary
At 150 nl·L-1 ozone, water use efficiency showed the adverse trend before 11:00.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- 150 nl·L-1 of ozonee0
- Outcome
- water use efficiencye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in treatment 150 nl·L-1 of ozone,the transpiration rate and stomatal conductance increased significantly before 11:00,but the water use efficiency was in adverse.”
t0“winter wheat”
Claim · model-written summary
Water use efficiency increased significantly at 13:00-15:00 in both ozone treatments.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- both casese0
- Outcome
- water use efficiencye0
- Direction
- increasede0
- Qualifier
- 13:00-15:00e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 13:00-15:00,the water use efficiency increased significantly in both cases.”
t0“winter wheat”
Claim · model-written summary
At 100 nl·L-1 ozone without environmental stress, authors attributed lower photosynthesis to stomatal limitation.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- 100 nl·L-1 of ozonee1
- Outcome
- decrease of net photosynthetic ratee0
- Qualifier
- stomatale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under no environmental stress,the decrease of net photosynthetic rate could be attributed to the stomatal and non-stomatal limitation in treatments 100 and 150 nl·L-1 of ozone,respectively.”
t0“winter wheat”
e1“In treatment 100 nl·L-1 of ozone,the stoma limit value,transpiration rate,stomatal conductance,and water use efficiency had a change trend basically in accordance with that in control”
Claim · model-written summary
At 150 nl·L-1 ozone without environmental stress, authors attributed lower photosynthesis to non-stomatal limitation.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- 150 nl·L-1 of ozonee0
- Outcome
- decrease of net photosynthetic ratee0
- Qualifier
- non-stomatal limitatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under no environmental stress,the decrease of net photosynthetic rate could be attributed to the stomatal and non-stomatal limitation in treatments 100 and 150 nl·L-1 of ozone,respectively.”
t0“winter wheat”
Claim · model-written summary
Under stressed environment, 100 nl·L-1 ozone significantly improved water use efficiency.
- Taxon
- winter wheatTriticum aestivume0
- Treatment
- 100 nl·L-1 of ozonee1
- Outcome
- water use efficiencye0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under stressed environment,both 100 and 150 nl·L-1 of ozone improved the winter wheat water use efficiency significantly”
e1“In treatment 100 nl·L-1 of ozone,the stoma limit value,transpiration rate,stomatal conductance,and water use efficiency had a change trend basically in accordance with that in control”
Claim · model-written summary
Under stressed environment, 150 nl·L-1 ozone significantly improved water use efficiency.
- Taxon
- winter wheatTriticum aestivume0
- Treatment
- 150 nl·L-1 of ozonee0
- Outcome
- water use efficiencye0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under stressed environment,both 100 and 150 nl·L-1 of ozone improved the winter wheat water use efficiency significantly”
Claim · model-written summary
At 150 nl·L-1 ozone, intercellular CO2 use efficiency increased significantly.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- 150 nl·L-1 of ozonee0
- Outcome
- intercellular CO2 use efficiencye0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“150 nl·L-1 of ozone induced a significant increase of intercellular CO2 use efficiency.”
t0“winter wheat”
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