Abstract
Atmospheric ozone causes various highly reactive intermediates (eg. peroxyl and superoxide radicals, H{sub 2}O{sub 2} etc.) to form in plant tissues. A plants productivity in environments with ozone may be related to its ability to scavenge the free radicals formed. The effects of ozone on photosynthesis (PS) and some free radical scavengers were measured in poplars (fifth emergent leaf). Clonal poplars (P. deltoides X P. cv. caudina) were grown and fumigated with 180 ppb ozone for 3 h at appropriate times. Total glutathione (GSH GSSG) increased in fumigated leaves. The ratio of GSH/GSSG decreased from 18.8 to 1.2 in fumigated plants. Superoxide dismutase levels increased 2-fold in fumigated plants. PS declined approx. 50% in fumigated plants even though electron transport and HADPH levels were unaffected. We speculate that reduced PS may be due to a diversion of energy to ozone adaptation processes.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 6
Claim · model-written summary
Total glutathione increased in ozone-fumigated poplar leaves.
- Material
- P. deltoides X P. cv. caudinae0
- Treatment
- 180 ppb ozone for 3 he0
- Outcome
- Total glutathione (GSH GSSG)e0
- Direction
- increasede0
PopulusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Clonal poplars (P. deltoides X P. cv. caudina) were grown and fumigated with 180 ppb ozone for 3 h at appropriate times. Total glutathione (GSH GSSG) increased in fumigated leaves”
Claim · model-written summary
The GSH/GSSG ratio fell from 18.8 to 1.2 in fumigated plants.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ratio of GSH/GSSG decreased from 18.8 to 1.2 in fumigated plants”
e1“poplars (fifth emergent leaf)”
e2“fumigated with 180 ppb ozone for 3 h”
Claim · model-written summary
Superoxide dismutase levels doubled in fumigated poplars.
- Treatment
- 180 ppb ozone for 3 he2
- Outcome
- Superoxide dismutase levelse0
- Direction
- increasede0
- Value
- 2-folde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Superoxide dismutase levels increased 2-fold in fumigated plants”
e1“poplars (fifth emergent leaf)”
e2“fumigated with 180 ppb ozone for 3 h”
Claim · model-written summary
Photosynthesis declined approximately 50% in fumigated poplars.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PS declined approx. 50% in fumigated plants”
e1“poplars (fifth emergent leaf)”
e2“fumigated with 180 ppb ozone for 3 h”
Claim · model-written summary
Electron transport and HADPH levels were unaffected by ozone fumigation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“electron transport and HADPH levels were unaffected”
e1“poplars (fifth emergent leaf)”
e2“fumigated with 180 ppb ozone for 3 h”
Claim · model-written summary
The authors speculate reduced photosynthesis may reflect energy diversion to ozone adaptation.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We speculate that reduced PS may be due to a diversion of energy to ozone adaptation processes”
e1“poplars (fifth emergent leaf)”
The same questions in other papers
ozone · physiology: photosynthesis · Populus (poplar)Results differ
16 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- negative
14 papers more in this group
See all 18 papers →ozone · physiology: antioxidant enzymes · Populus (poplar)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
ozone · molecular: metabolites · Populus (poplar)Positive and negative results
6 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- no effect
4 papers more in this group
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.