Abstract
To assess photosynthesis and yield components' response of field-grown wheat to increasing ozone (O3) concentration (based on diurnal pattern of ambient O3) in China, winter wheat (Triticum aestivum L.) cv. Jia 403 was planted in open top chambers and exposed to three different O3 concentrations: O3-free air (CF), ambient air (NF), and O3-free air with additional O3 (CF+O3). Diurnal changes of gas exchange and net photosynthetic rate (P N) in response to photosynthetic photon flux density (PPFD) of flag leaves were measured at the filling grain stage, and yield components were investigated at harvest. High O3 concentration altered diurnal course of gas exchange [P N, stomatal conductance (g s), and intercellular CO2 concentration (C i)] and decreased significantly their values except for C i. Apparent quantum yield (AQY), compensation irradiance (CI), and saturation irradiance (SI) were significantly decreased, suggesting photosynthetic capacity was also altered, characterized as reduced photon-saturated photosynthetic rate (P Nmax). The limit of photosynthetic activity was probably dominated by non-stomatal factors in combination with stomatal closure. The significant reduction in yield was observed in CF+O3 treatment as a result of a marked decrease in the ear length and the number of grains per ear, and a significant increase in the number of infertile florets per ear. Even though similar responses were also observed in plants exposed to ambient O3 concentration, no statistical difference was observed at current ambient O3 concentration in China.
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Claims 11
Claim · model-written summary
High ozone changed the diurnal course of flag leaf gas exchange.
- Taxon
- Triticum aestivum L.
Triticum aestivume1 - Material
- Jia 403e1
- Treatment
- High O3 concentratione0
- Outcome
- diurnal course of gas exchangee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High O3 concentration altered diurnal course of gas exchange [P N, stomatal conductance (g s), and intercellular CO2 concentration (C i)] and decreased significantly their values except for C i.”
e1“winter wheat (Triticum aestivum L.) cv. Jia 403”
Claim · model-written summary
High ozone significantly decreased net photosynthetic rate and stomatal conductance.
- Taxon
- Triticum aestivum L.Triticum aestivume1
- Material
- Jia 403e1
- Treatment
- High O3 concentratione0
- Outcome
- P N, stomatal conductance (g s)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High O3 concentration altered diurnal course of gas exchange [P N, stomatal conductance (g s), and intercellular CO2 concentration (C i)] and decreased significantly their values except for C i.”
e1“winter wheat (Triticum aestivum L.) cv. Jia 403”
Claim · model-written summary
High ozone did not show a stated decrease in intercellular CO2 concentration.
- Taxon
- Triticum aestivum L.Triticum aestivume1
- Material
- Jia 403e1
- Treatment
- High O3 concentratione0
- Outcome
- intercellular CO2 concentration (C i)e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High O3 concentration altered diurnal course of gas exchange [P N, stomatal conductance (g s), and intercellular CO2 concentration (C i)] and decreased significantly their values except for C i.”
e1“winter wheat (Triticum aestivum L.) cv. Jia 403”
Claim · model-written summary
High ozone significantly decreased apparent quantum yield, compensation irradiance and saturation irradiance.
- Taxon
- Triticum aestivum L.Triticum aestivume1
- Material
- Jia 403e1
- Treatment
- High O3 concentratione2
- Outcome
- Apparent quantum yield (AQY), compensation irradiance (CI), and saturation irradiance (SI)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Apparent quantum yield (AQY), compensation irradiance (CI), and saturation irradiance (SI) were significantly decreased”
e1“winter wheat (Triticum aestivum L.) cv. Jia 403”
e2“High O3 concentration altered diurnal course of gas exchange [P N, stomatal conductance (g s), and intercellular CO2 concentration (C i)] and decreased significantly their values except for C i.”
Claim · model-written summary
Elevated ozone reduced photon saturated photosynthetic rate.
- Taxon
- Triticum aestivum L.Triticum aestivume1
- Material
- Jia 403e1
- Treatment
- High O3 concentratione2
- Outcome
- photon-saturated photosynthetic rate (P Nmax)e0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“characterized as reduced photon-saturated photosynthetic rate (P Nmax).”
e1“winter wheat (Triticum aestivum L.) cv. Jia 403”
e2“High O3 concentration altered diurnal course of gas exchange [P N, stomatal conductance (g s), and intercellular CO2 concentration (C i)] and decreased significantly their values except for C i.”
Claim · model-written summary
Non stomatal factors and stomatal closure probably limited photosynthetic activity.
- Taxon
- Triticum aestivum L.Triticum aestivume1
- Material
- Jia 403e1
- Outcome
- limit of photosynthetic activitye0
- Qualifier
- non-stomatal factors in combination with stomatal closuree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The limit of photosynthetic activity was probably dominated by non-stomatal factors in combination with stomatal closure.”
e1“winter wheat (Triticum aestivum L.) cv. Jia 403”
Claim · model-written summary
Additional ozone significantly reduced wheat yield.
- Taxon
- Triticum aestivum L.Triticum aestivume1
- Material
- Jia 403e1
- Treatment
- CF+O3 treatmente0
- Outcome
- yielde0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The significant reduction in yield was observed in CF+O3 treatment as a result of a marked decrease in the ear length and the number of grains per ear, and a significant increase in the number of infertile florets per ear.”
e1“winter wheat (Triticum aestivum L.) cv. Jia 403”
Claim · model-written summary
Additional ozone markedly decreased ear length.
- Taxon
- Triticum aestivum L.Triticum aestivume1
- Material
- Jia 403e1
- Treatment
- CF+O3 treatmente0
- Outcome
- ear lengthe0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The significant reduction in yield was observed in CF+O3 treatment as a result of a marked decrease in the ear length and the number of grains per ear, and a significant increase in the number of infertile florets per ear.”
e1“winter wheat (Triticum aestivum L.) cv. Jia 403”
Claim · model-written summary
Additional ozone markedly decreased grains per ear.
- Taxon
- Triticum aestivum L.Triticum aestivume1
- Material
- Jia 403e1
- Treatment
- CF+O3 treatmente0
- Outcome
- number of grains per eare0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The significant reduction in yield was observed in CF+O3 treatment as a result of a marked decrease in the ear length and the number of grains per ear, and a significant increase in the number of infertile florets per ear.”
e1“winter wheat (Triticum aestivum L.) cv. Jia 403”
Claim · model-written summary
Additional ozone significantly increased infertile florets per ear.
- Taxon
- Triticum aestivum L.Triticum aestivume1
- Material
- Jia 403e1
- Treatment
- CF+O3 treatmente0
- Outcome
- number of infertile florets per eare0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The significant reduction in yield was observed in CF+O3 treatment as a result of a marked decrease in the ear length and the number of grains per ear, and a significant increase in the number of infertile florets per ear.”
e1“winter wheat (Triticum aestivum L.) cv. Jia 403”
Claim · model-written summary
Ambient ozone produced similar responses without statistical differences at current ambient concentration.
- Taxon
- Triticum aestivum L.Triticum aestivume1
- Material
- Jia 403e1
- Treatment
- ambient O3 concentratione0
- Outcome
- similar responsese0
- Setting
- Chinae0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Even though similar responses were also observed in plants exposed to ambient O3 concentration, no statistical difference was observed at current ambient O3 concentration in China.”
e1“winter wheat (Triticum aestivum L.) cv. Jia 403”
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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.