Abstract
Carbon dioxide exchange rates (CER) of intact soybean (Glycine max (L.) Merr.) plants at the fruiting stage were measured in continuous stirred tank reactor (CSTR) chambers. Plants were exposed to clean air, 67 ppb ozone (O 3 ), 300 ppb sulphur dioxide (SO 2 ), or 67 ppb O 3 plus 300 ppb SO 2 for 7.5 h∙day −1 for 5 days. Carbon dioxide exchange rates were measured hourly during the last 6 h of each exposure period and decreased progressively during the first period of exposure to O 3 plus SO 2 , dropping in hour 6 to 42% of the hour 1 rate, and to a lesser extent in the second daily exposure when the corresponding decline was to 70%. There was a declining trend in CER of SO 2 -treated but not O 3 -treated plants with increasing number of days of exposure. Carbon dioxide exchange rates of all plants generally peaked and declined during each exposure period.Key words: Air pollution, net photosynthesis, mixtures, Glycine max
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Claims 5
Claim · model-written summary
Combined ozone and sulphur dioxide exposure lowered soybean CER to 42% of the hour 1 rate in hour 6 of the first exposure.
- Taxon
- soybean
Glycine maxe1 - Organ / stage
- fruiting stagee1
- Treatment
- O 3 plus SO 2e0
- Outcome
- Carbon dioxide exchange rates (CER)e1
- Direction
- decreasede0
- Value
- 42%e0
- Qualifier
- first period of exposuree0
- Comparator
- the hour 1 ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased progressively during the first period of exposure to O 3 plus SO 2 , dropping in hour 6 to 42% of the hour 1 rate”
e1“Carbon dioxide exchange rates (CER) of intact soybean (Glycine max (L.) Merr.) plants at the fruiting stage”
Claim · model-written summary
Combined exposure lowered soybean CER to 70% of the hour 1 rate during the second daily exposure.
- Taxon
- soybeanGlycine maxe1
- Organ / stage
- fruiting stagee1
- Treatment
- O 3 plus SO 2e3
- Outcome
- Carbon dioxide exchange rates (CER)e1
- Direction
- declinee0
- Value
- 70%e0
- Qualifier
- second daily exposuree0
- Comparator
- the hour 1 ratee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“to a lesser extent in the second daily exposure when the corresponding decline was to 70%”
e1“Carbon dioxide exchange rates (CER) of intact soybean (Glycine max (L.) Merr.) plants at the fruiting stage”
e2“the hour 1 rate, and to a lesser extent in the second daily exposure”
e3“exposure to O 3 plus SO 2”
Claim · model-written summary
SO2-treated soybean had a declining CER trend as exposure days increased.
- Taxon
- soybeanGlycine maxe1
- Treatment
- SO 2 -treatede0
- Outcome
- CERe0
- Direction
- declininge0
- Qualifier
- increasing number of days of exposuree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a declining trend in CER of SO 2 -treated but not O 3 -treated plants with increasing number of days of exposure.”
e1“soybean (Glycine max (L.) Merr.) plants”
Claim · model-written summary
O3-treated soybean had no declining CER trend with exposure days.
- Taxon
- soybeanGlycine maxe1
- Treatment
- O 3 -treatede0
- Outcome
- CERe0
- Direction
- note0
- Qualifier
- increasing number of days of exposuree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a declining trend in CER of SO 2 -treated but not O 3 -treated plants with increasing number of days of exposure.”
e1“soybean (Glycine max (L.) Merr.) plants”
Claim · model-written summary
CER generally peaked then declined during each exposure period for all soybean plants.
- Taxon
- soybeanGlycine maxe1
- Outcome
- Carbon dioxide exchange ratese0
- Direction
- peaked and declinede0
- Qualifier
- during each exposure periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Carbon dioxide exchange rates of all plants generally peaked and declined during each exposure period.”
e1“soybean (Glycine max (L.) Merr.) plants”
The same questions in other papers
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- positive
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See all 22 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.