Abstract
Hybrid poplar plants were exposed to 0.5 ppm SO 2 , 0.25 ppm O 3 or 0.5 ppm SO 2 + 0.25 ppm O 3 , 12 hr/day for 24 days to ascertain their effects on leaf growth and abscission. The data revealed that both O 3 alone and O 3 + SO 2 promoted leaf abscission, while SO 2 alone had no effect. Leaf area and dry weight were reduced while leaf abscission was stimulated by ozone fumigation. The interaction found between SO 2 and O 3 , with all the parameters measured, was an antagonistic relationship in which SO 2 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 O 3 alone and O 3 + SO 2 promoted leaf abscission”
t0“HYBRID POPLAR”
Claim · model-written summary
Ozone plus sulfur dioxide promoted leaf abscission.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both O 3 alone and O 3 + SO 2 promoted leaf abscission”
t0“HYBRID POPLAR”
Claim · model-written summary
Sulfur dioxide alone had no effect on leaf abscission.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SO 2 alone had no effect”
t0“HYBRID POPLAR”
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“HYBRID POPLAR”
Claim · model-written summary
Sulfur dioxide reduced the toxic effect of ozone across measured parameters.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SO 2 reduced the toxic effect of ozone”
t0“HYBRID POPLAR”
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“HYBRID POPLAR”
Claim · model-written summary
Ozone significantly reduced leaf area and weight at later developmental stages.
- 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“HYBRID POPLAR”
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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.