Abstract
Hybrid poplar plants were exposed to 0.5 ppm SO2, 0.25 ppm O3 or 0.5 ppm SO2 + 0.25 ppm O3, 12 hr/day for 24 days to ascertain their effects on leaf growth and abscission. The data revealed that both O3 alone and O3 + SO2 promoted leaf abscission, while SO2 alone had no effect. Leaf area and dry weight were reduced while leaf abscission was stimulated by ozone fumigation. The interaction found between SO2 and O3, with all the parameters measured, was an antagonistic relationship in which SO2 reduced the toxic effect of ozone. The data analyzed, in relation to leaf position, demonstrated that ozone did not affect development of the six youngest rapidly growing leaves. However, ozone significantly reduced both leaf area and leaf weight, at later stages of development.
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Claims 7
Claim · model-written summary
Ozone alone promoted leaf abscission.
PopulusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both O3 alone and O3 + SO2 promoted leaf abscission, while SO2 alone had no effect”
t0“Effects of Sulfur Dioxide and Ozone on Growth of Hybrid Poplar Leaves”
Claim · model-written summary
Combined ozone and sulfur dioxide promoted leaf abscission.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both O3 alone and O3 + SO2 promoted leaf abscission, while SO2 alone had no effect”
t0“Effects of Sulfur Dioxide and Ozone on Growth of Hybrid Poplar Leaves”
Claim · model-written summary
Sulfur dioxide alone did not affect leaf abscission.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both O3 alone and O3 + SO2 promoted leaf abscission, while SO2 alone had no effect”
t0“Effects of Sulfur Dioxide and Ozone on Growth of Hybrid Poplar Leaves”
Claim · model-written summary
Ozone fumigation reduced leaf area and dry weight.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf area and dry weight were reduced while leaf abscission was stimulated by ozone fumigation”
t0“Effects of Sulfur Dioxide and Ozone on Growth of Hybrid Poplar Leaves”
Claim · model-written summary
Sulfur dioxide antagonized ozone toxicity across measured parameters.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The interaction found between SO2 and O3, with all the parameters measured, was an antagonistic relationship in which SO2 reduced the toxic effect of ozone”
t0“Effects of Sulfur Dioxide and Ozone on Growth of Hybrid Poplar Leaves”
Claim · model-written summary
Ozone did not affect development of the six youngest leaves.
- Treatment
- ozonee0
- Outcome
- development of the six youngest rapidly growing leavese0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ozone did not affect development of the six youngest rapidly growing leaves”
t0“Effects of Sulfur Dioxide and Ozone on Growth of Hybrid Poplar Leaves”
Claim · model-written summary
At later development stages, ozone reduced leaf area and weight.
- Treatment
- ozonee0
- Outcome
- leaf area and leaf weighte0
- Direction
- reducede0
- Qualifier
- at later stages of developmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ozone significantly reduced both leaf area and leaf weight, at later stages of development”
t0“Effects of Sulfur Dioxide and Ozone on Growth of Hybrid Poplar Leaves”
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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.