Abstract
Matters, G. L. and Scandalios, J. G. 1987. Synthesis of isozymes of superoxide dismutase in maize leaves in response to O3 SO2 and elevated O2.—J. exp. Bot 38: 842–852. The activities of the enzymes superoxide dismutase (SOD) and catalase were determined in maize leaves treated with O3or SO2for 8 h, or with elevated levels of oxygen for up to 96 h. Neither O3nor SO2significantly increased the levels of superoxide dismutase or catalase activity. However, after 72 h in an atmosphere containing 90% oxygen, superoxide dismutase activity was increased, but not the activities of catalase, ascorbate pcroxidase, and malate dehydrogenase. Immunological analysis showed that amounts of the cytosolic superoxide dismutase isozymes, SOD-2 and SOD-4, were increased by the elevated oxygen but not the chroloplast (SOD-1) or mitochondrial (SOD-3) isozymes. Immunoprecipitation of translation products of leaf polysomes indicated that the higher levels of SOD-2 and SOD-4 were due to increased amounts of polysome-bound mRNA coding for these proteins. The specific response of SOD-2 and SOD-4 to 90% oxygen treatments contrasts with the increase in all SOD isozymes in maize leaves treated with the herbicide paraquat.
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Claims 13
Claim · model-written summary
O3 did not significantly increase superoxide dismutase.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Neither O3nor SO2significantly increased the levels of superoxide dismutase or catalase activity.”
t0“Maize Leaves”
Claim · model-written summary
O3 did not significantly increase catalase activity.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Neither O3nor SO2significantly increased the levels of superoxide dismutase or catalase activity.”
t0“Maize Leaves”
Claim · model-written summary
SO2 did not significantly increase superoxide dismutase.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Neither O3nor SO2significantly increased the levels of superoxide dismutase or catalase activity.”
t0“Maize Leaves”
Claim · model-written summary
SO2 did not significantly increase catalase activity.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Neither O3nor SO2significantly increased the levels of superoxide dismutase or catalase activity.”
t0“Maize Leaves”
Claim · model-written summary
After 72 hours at 90% oxygen, superoxide dismutase activity increased.
- Treatment
- 90% oxygene0
- Outcome
- superoxide dismutase activitye0
- Direction
- increasede0
- Qualifier
- after 72 he0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, after 72 h in an atmosphere containing 90% oxygen, superoxide dismutase activity was increased, but not the activities of catalase, ascorbate pcroxidase, and malate dehydrogenase.”
t0“Maize Leaves”
Claim · model-written summary
Catalase, ascorbate peroxidase, and malate dehydrogenase activities did not increase at 90% oxygen.
- Treatment
- 90% oxygene0
- Outcome
- activities of catalase, ascorbate pcroxidase, and malate dehydrogenasee0
- Direction
- but note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, after 72 h in an atmosphere containing 90% oxygen, superoxide dismutase activity was increased, but not the activities of catalase, ascorbate pcroxidase, and malate dehydrogenase.”
t0“Maize Leaves”
Claim · model-written summary
SOD-2 protein amount increased under elevated oxygen.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Immunological analysis showed that amounts of the cytosolic superoxide dismutase isozymes, SOD-2 and SOD-4, were increased by the elevated oxygen but not the chroloplast (SOD-1) or mitochondrial (SOD-3) isozymes.”
t0“Maize Leaves”
Claim · model-written summary
SOD-4 protein amount increased under elevated oxygen.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Immunological analysis showed that amounts of the cytosolic superoxide dismutase isozymes, SOD-2 and SOD-4, were increased by the elevated oxygen but not the chroloplast (SOD-1) or mitochondrial (SOD-3) isozymes.”
t0“Maize Leaves”
Claim · model-written summary
SOD-1 protein amount did not increase under elevated oxygen.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Immunological analysis showed that amounts of the cytosolic superoxide dismutase isozymes, SOD-2 and SOD-4, were increased by the elevated oxygen but not the chroloplast (SOD-1) or mitochondrial (SOD-3) isozymes.”
t0“Maize Leaves”
Claim · model-written summary
SOD-3 protein amount did not increase under elevated oxygen.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Immunological analysis showed that amounts of the cytosolic superoxide dismutase isozymes, SOD-2 and SOD-4, were increased by the elevated oxygen but not the chroloplast (SOD-1) or mitochondrial (SOD-3) isozymes.”
t0“Maize Leaves”
Claim · model-written summary
Higher SOD-2 protein levels were attributed to increased polysome-bound mRNA.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Immunoprecipitation of translation products of leaf polysomes indicated that the higher levels of SOD-2 and SOD-4 were due to increased amounts of polysome-bound mRNA coding for these proteins.”
t0“Maize Leaves”
Claim · model-written summary
Higher SOD-4 protein levels were attributed to increased polysome-bound mRNA.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Immunoprecipitation of translation products of leaf polysomes indicated that the higher levels of SOD-2 and SOD-4 were due to increased amounts of polysome-bound mRNA coding for these proteins.”
t0“Maize Leaves”
Claim · model-written summary
Paraquat increased all SOD isozymes in maize leaves.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The specific response of SOD-2 and SOD-4 to 90% oxygen treatments contrasts with the increase in all SOD isozymes in maize leaves treated with the herbicide paraquat.”
The same questions in other papers
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- positive
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ozone · physiology: antioxidant enzymes · Zea mays (maize)Results differ
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- positive
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See all 6 papers →herbicide · physiology: antioxidant enzymes · Zea mays (maize)Positive and negative results
4 papers in the same direction as this paper · 3 in the opposite direction
- negative
- no effect
- negative
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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.