Abstract
Mature Thompson Seedless grapevines were exposed to charcoal-filtered air or ambient ozone in open-top field chambers near Fresno, CA. Chronic exposure to ambient ozone reduced net carbon dioxide assimilation rates an average of 9% through the season when compared to the filtered-air treatment. The initial slope of a carboxylation efficiency curve was less for the ambient ozone treatment compared to the filtered-air treatment. Individual leaves were exposed to ozone concentrations of 200, 400, or 600 ppb for 5 to 10 hours. No visual ozone damage was found. Exposure of leaves to 200 ppb ozone for 5 hours had no effect on photosynthesis. Photosynthesis was reduced approximately 50 to 80% respectively after 5 hours of exposure to 400 and 600 ppb ozone compared to the controls. There were no significant differences in vine-growth parameters, bud fruitfulness or yield between vines exposed to either filtered or ambient air. Net carbon dioxide assimilation rates for five of six potted grape cultivars exposed to 1.5 times ambient ozone concentrations were substantially less than for those grown in the charcoal-filtered air. The cultivar 'Barbera' had greater rates of photosynthesis at the higher ozone concentration.
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Claims 8
Claim · model-written summary
Chronic exposure to ambient ozone reduced net carbon dioxide assimilation rates of Thompson Seedless grapevines by an average of 9% through the season relative to filtered air in open-top field chambers near Fresno, CA.
Verbatim
e0“Mature Thompson Seedless grapevines were exposed to charcoal-filtered air or ambient ozone in open-top field chambers near Fresno, CA”
e1“Chronic exposure to ambient ozone reduced net carbon dioxide assimilation rates an average of 9% through the season when compared to the filtered-air treatment”
Claim · model-written summary
The initial slope of the carboxylation efficiency curve of grapevines was lower under ambient ozone than under filtered air.
Verbatim
e0“Mature Thompson Seedless grapevines”
e1“The initial slope of a carboxylation efficiency curve was less for the ambient ozone treatment compared to the filtered-air treatment”
Claim · model-written summary
Photosynthesis of individual grapevine leaves was reduced by approximately 50 to 80% after 5 hours of exposure to 400 and 600 ppb ozone respectively, compared with controls.
Verbatim
e0“Mature Thompson Seedless grapevines”
e1“Photosynthesis was reduced approximately 50 to 80% respectively after 5 hours of exposure to 400 and 600 ppb ozone compared to the controls”
Claim · model-written summary
Exposure of leaves to 200 ppb ozone for 5 hours had no effect on photosynthesis.
- Taxon
- Thompson Seedless grapevinese0
- Treatment
- 200 ppb ozone for 5 hourse1
- Outcome
- photosynthesise1
- Direction
- no effecte1
Not reportedComparator
Verbatim
e0“Mature Thompson Seedless grapevines”
e1“Exposure of leaves to 200 ppb ozone for 5 hours had no effect on photosynthesis”
Claim · model-written summary
No visual ozone damage was found on the exposed grapevine leaves.
Not reportedDirection
Verbatim
e0“Mature Thompson Seedless grapevines”
e1“No visual ozone damage was found”
Claim · model-written summary
There were no significant differences in vine-growth parameters, bud fruitfulness or yield between grapevines exposed to filtered or ambient air.
Verbatim
e0“Mature Thompson Seedless grapevines”
e1“There were no significant differences in vine-growth parameters, bud fruitfulness or yield between vines exposed to either filtered or ambient air”
Claim · model-written summary
Net carbon dioxide assimilation rates of five of six potted grape cultivars exposed to 1.5 times ambient ozone were substantially lower than those grown in charcoal-filtered air.
Verbatim
e0“Net carbon dioxide assimilation rates for five of six potted grape cultivars exposed to 1.5 times ambient ozone concentrations were substantially less than for those grown in the charcoal-filtered air”
Claim · model-written summary
The grape cultivar 'Barbera' had greater rates of photosynthesis at the higher ozone concentration.
- Taxon
- grapee0
- Material
- 'Barbera'e1
- Treatment
- higher ozone concentratione1
- Outcome
- rates of photosynthesise1
- Direction
- greatere1
Not reportedComparator
Verbatim
e0“potted grape cultivars”
e1“The cultivar 'Barbera' had greater rates of photosynthesis at the higher ozone concentration”
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- positive
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5 papers more in this group
See all 9 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.