Abstract
Ozone causes the formation of free radicals in vivo. Our previous results indicate no changes in photosynthesis in poplar for the first 90 min. of 180ppb ozone exposure, although 4 hrs after the end of the exposure, it was inhibited by 60%. Other changes may precede effects on photosynthesis. We have found that glutathione and SOD increase (2.5x and 0.25x) respectively during this initial period. Glutathione levels and SOD activity remain elevated (3.5x and 0.75x respectively) up to 21 hrs after ozone exposure, while photosynthesis had recovered to ca. 75% of the original levels.
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Claims 7
Claim · model-written summary
Photosynthesis in poplar did not change during the first 90 minutes of ozone exposure.
PopulusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no changes in photosynthesis in poplar for the first 90 min. of 180ppb ozone exposure”
Claim · model-written summary
Poplar photosynthesis was inhibited by 60% four hours after ozone exposure.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“4 hrs after the end of the exposure, it was inhibited by 60%”
e1“photosynthesis in poplar”
Claim · model-written summary
Glutathione increased 2.5-fold during the initial ozone exposure period.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“glutathione and SOD increase (2.5x and 0.25x) respectively during this initial period”
e1“photosynthesis in poplar”
Claim · model-written summary
SOD increased 0.25-fold during the initial ozone exposure period.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“glutathione and SOD increase (2.5x and 0.25x) respectively during this initial period”
e1“photosynthesis in poplar”
Claim · model-written summary
Glutathione remained elevated 3.5-fold up to 21 hours after ozone exposure.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glutathione levels and SOD activity remain elevated (3.5x and 0.75x respectively) up to 21 hrs after ozone exposure”
e1“photosynthesis in poplar”
Claim · model-written summary
SOD activity remained elevated 0.75-fold up to 21 hours after ozone exposure.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glutathione levels and SOD activity remain elevated (3.5x and 0.75x respectively) up to 21 hrs after ozone exposure”
e1“photosynthesis in poplar”
Claim · model-written summary
Poplar photosynthesis recovered to about 75% of its original level after ozone exposure.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“photosynthesis had recovered to ca. 75% of the original levels”
e1“photosynthesis in poplar”
The same questions in other papers
ozone · physiology: photosynthesis · Populus (poplar)Results differ
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7 in the opposite direction
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See all 8 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.