Abstract
Two cultivars of soybeans (Glycine max (L.) Merr.) differing widely in their resistance to ozone were exposed to 0.5 μl/ℓ ozone for 2 h in growth chambers. In vivo nitrate reduction was depressed by more than 50% in the primary leaves of Dare, the ozone-sensitive cultivar, but was not significantly altered in Hood, the ozone-resistant cultivar. Sucrose, up to 1.5% (w/v), added to excised seedlings of the Dare cultivar during exposure to ozone eliminated the ozone depression of in vivo nitrate reductase activity and also reduced foliar injury. Addition of two glycolytic intermediates, glyceraldehyde-3-phosphate and fructose-1,6-diphosphate, to the infiltration medium recovered some in vivo nitrate reduction in treated Dare leaves. The levels of extractable nitrate reductase and glyceraldehyde-3-phosphate dehydrogenase in the primary leaves of both cultivars were unaltered by ozone fumigations. These observations led to the conclusion that ozone depression of in vivo nitrate reduction is not due to ozone inactivation of nitrate reductase or of the enzymes coupling nitrate reduction to glycolysis, but may be caused by an inadequate supply of photosynthetic sugars. It was also noted that ozone depression of in vivo nitrate reduction only occurred with treatments which subsequently caused the development of visible foliar injury.
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Claims 10
Claim · model-written summary
Ozone depressed in vivo nitrate reduction by more than 50% in Dare primary leaves.
- Taxon
- soybeans
Glycine maxe1 - Material
- Daree0
- Organ / stage
- primary leavese0
- Treatment
- 0.5 μl/ℓ ozone for 2 he1
- Outcome
- In vivo nitrate reductione0
- Direction
- depressede0
- Value
- more than 50%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In vivo nitrate reduction was depressed by more than 50% in the primary leaves of Dare, the ozone-sensitive cultivar”
e1“Two cultivars of soybeans (Glycine max (L.) Merr.) differing widely in their resistance to ozone were exposed to 0.5 μl/ℓ ozone for 2 h in growth chambers.”
Claim · model-written summary
Ozone did not significantly alter in vivo nitrate reduction in Hood.
- Taxon
- soybeansGlycine maxe2
- Material
- Hoode0
- Treatment
- 0.5 μl/ℓ ozone for 2 he2
- Outcome
- In vivo nitrate reductione1
- Direction
- not significantly alterede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“was not significantly altered in Hood, the ozone-resistant cultivar”
e1“In vivo nitrate reduction was depressed by more than 50% in the primary leaves of Dare, the ozone-sensitive cultivar, but was not significantly altered in Hood, the ozone-resistant cultivar.”
e2“Two cultivars of soybeans (Glycine max (L.) Merr.) differing widely in their resistance to ozone were exposed to 0.5 μl/ℓ ozone for 2 h in growth chambers.”
Claim · model-written summary
Sucrose eliminated ozone suppression of nitrate reductase activity in Dare.
- Taxon
- soybeansGlycine maxe1
- Material
- Daree0
- Organ / stage
- excised seedlingse0
- Treatment
- Sucrose, up to 1.5% (w/v)e0
- Outcome
- in vivo nitrate reductase activitye0
- Direction
- eliminatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sucrose, up to 1.5% (w/v), added to excised seedlings of the Dare cultivar during exposure to ozone eliminated the ozone depression of in vivo nitrate reductase activity”
e1“Two cultivars of soybeans (Glycine max (L.) Merr.)”
Claim · model-written summary
Sucrose reduced foliar injury in ozone exposed Dare.
- Taxon
- soybeansGlycine maxe1
- Material
- Daree0
- Treatment
- Sucrose, up to 1.5% (w/v)e0
- Outcome
- foliar injurye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sucrose, up to 1.5% (w/v), added to excised seedlings of the Dare cultivar during exposure to ozone eliminated the ozone depression of in vivo nitrate reductase activity and also reduced foliar injury.”
e1“Two cultivars of soybeans (Glycine max (L.) Merr.)”
Claim · model-written summary
Glyceraldehyde-3-phosphate restored some nitrate reduction in ozone treated Dare leaves.
- Taxon
- soybeansGlycine maxe1
- Material
- Daree0
- Treatment
- glyceraldehyde-3-phosphatee0
- Outcome
- in vivo nitrate reductione0
- Direction
- recoverede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition of two glycolytic intermediates, glyceraldehyde-3-phosphate and fructose-1,6-diphosphate, to the infiltration medium recovered some in vivo nitrate reduction in treated Dare leaves.”
e1“Two cultivars of soybeans (Glycine max (L.) Merr.)”
Claim · model-written summary
Fructose-1,6-diphosphate restored some nitrate reduction in ozone treated Dare leaves.
- Taxon
- soybeansGlycine maxe1
- Material
- Daree0
- Treatment
- fructose-1,6-diphosphatee0
- Outcome
- in vivo nitrate reductione0
- Direction
- recoverede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition of two glycolytic intermediates, glyceraldehyde-3-phosphate and fructose-1,6-diphosphate, to the infiltration medium recovered some in vivo nitrate reduction in treated Dare leaves.”
e1“Two cultivars of soybeans (Glycine max (L.) Merr.)”
Claim · model-written summary
Ozone did not alter extractable nitrate reductase levels in either cultivar.
- Taxon
- soybeansGlycine maxe1
- Organ / stage
- primary leavese0
- Treatment
- ozone fumigationse0
- Outcome
- levels of extractable nitrate reductasee0
- Direction
- unalterede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The levels of extractable nitrate reductase and glyceraldehyde-3-phosphate dehydrogenase in the primary leaves of both cultivars were unaltered by ozone fumigations.”
e1“Two cultivars of soybeans (Glycine max (L.) Merr.)”
Claim · model-written summary
Ozone did not alter glyceraldehyde-3-phosphate dehydrogenase levels in either cultivar.
- Taxon
- soybeansGlycine maxe1
- Organ / stage
- primary leavese0
- Treatment
- ozone fumigationse0
- Outcome
- glyceraldehyde-3-phosphate dehydrogenasee0
- Direction
- unalterede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The levels of extractable nitrate reductase and glyceraldehyde-3-phosphate dehydrogenase in the primary leaves of both cultivars were unaltered by ozone fumigations.”
e1“Two cultivars of soybeans (Glycine max (L.) Merr.)”
Claim · model-written summary
The authors propose inadequate photosynthetic sugar supply as a cause of ozone depressed nitrate reduction.
- Taxon
- soybeansGlycine maxe1
- Outcome
- ozone depression of in vivo nitrate reductione0
- Qualifier
- inadequate supply of photosynthetic sugarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ozone depression of in vivo nitrate reduction is not due to ozone inactivation of nitrate reductase or of the enzymes coupling nitrate reduction to glycolysis, but may be caused by an inadequate supply of photosynthetic sugars”
e1“Two cultivars of soybeans (Glycine max (L.) Merr.)”
Claim · model-written summary
Ozone suppression of nitrate reduction occurred only with treatments that subsequently caused visible foliar injury.
- Taxon
- soybeansGlycine maxe1
- Treatment
- treatments which subsequently caused the development of visible foliar injurye0
- Outcome
- ozone depression of in vivo nitrate reductione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ozone depression of in vivo nitrate reduction only occurred with treatments which subsequently caused the development of visible foliar injury”
e1“Two cultivars of soybeans (Glycine max (L.) Merr.)”
The same questions in other papers
sucrose · physiology: enzyme activity · Glycine max (soybean)Results agree
1 paper in the same direction as this paper
- positive
solarization · molecular: metabolites · Glycine max (soybean)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
ozone · physiology: enzyme activity · Glycine max (soybean)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
1 paper more in this group
See all 5 papers →ozone · molecular: metabolites · Glycine max (soybean)Positive and negative results
17 papers in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
18 papers more in this group
See all 22 papers →ozone · nutrient: content · Glycine max (soybean)Results agree
3 papers in the same direction as this paper
- no effect
- no effect
- negative
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.