Abstract
Prior illumination in CO(2)-free air enhances a respiration from maize (Zea mays L.) leaves different in onset and duration from the postillumination burst of photorespiration. The course of respiration after brief illumination of attached leaves was measured as CO(2) efflux in darkness into CO(2)-free atmospheres with four O(2) concentrations. The peak of CO(2) efflux following illumination was suppressed by 2.23% O(2), was completely eliminated by 0.04% O(2), and was not stimulated by 40% O(2) compared with air. Compared with air, steady dark respiration was suppressed by 0.04% O(2) but was not affected by 2.23% nor 40% O(2). Excision and subsequent uptake of distilled water through the vascular system nearly eliminated the enhanced respiration.Several metabolites fed to excised leaves through the vascular system during illumination doubled or tripled the respiration of maize in darkness. The sensitivity to 2.23% O(2) of the respiration of glycolic acid in the dark imitated the sensitivity to O(2) of attached leaves.The respiration of glycolic acid was inhibited by alpha-hydroxy-2-pyridinemethanesulfonate.While attached leaves and leaves fed glycolic acid both released little CO(2) into CO(2)-free air in bright light, declining illuminance caused a larger and prompter CO(2) efflux from leaves fed glycolic acid than from attached leaves. Leaves fed glycolic acid plus 3-(p-chlorophenyl)-1, 1-dimethyl urea released more CO(2) into CO(2)-free air in bright light than did controls fed glycolic acid.
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Claims 11
Claim · model-written summary
Prior illumination enhanced maize leaf respiration.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Prior illumination in CO(2)-free air enhances a respiration from maize (Zea mays L.) leaves”
Claim · model-written summary
At 2.23% O(2), peak postillumination CO(2) efflux was suppressed.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The peak of CO(2) efflux following illumination was suppressed by 2.23% O(2)”
t0“Maize”
Claim · model-written summary
At 0.04% O(2), peak postillumination CO(2) efflux was eliminated.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“was completely eliminated by 0.04% O(2)”
t0“Maize”
Claim · model-written summary
At 40% O(2), peak postillumination efflux was not stimulated relative to air.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“was not stimulated by 40% O(2) compared with air”
t0“Maize”
Claim · model-written summary
Steady dark respiration was suppressed by 0.04% O(2) relative to air.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with air, steady dark respiration was suppressed by 0.04% O(2)”
t0“Maize”
Claim · model-written summary
Steady dark respiration was unaffected by 2.23% or 40% O(2).
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“was not affected by 2.23% nor 40% O(2)”
t0“Maize”
Claim · model-written summary
Excision and water uptake nearly eliminated enhanced respiration.
- Treatment
- Excision and subsequent uptake of distilled watere0
- Outcome
- enhanced respiratione0
- Direction
- nearly eliminatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Excision and subsequent uptake of distilled water through the vascular system nearly eliminated the enhanced respiration”
t0“Maize”
Claim · model-written summary
Metabolites fed to excised leaves doubled or tripled dark respiration.
- Treatment
- Several metabolites fed to excised leavese0
- Outcome
- respiration of maize in darknesse0
- Direction
- doubled or triplede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Several metabolites fed to excised leaves through the vascular system during illumination doubled or tripled the respiration of maize in darkness”
Claim · model-written summary
Glycolic acid respiration was inhibited by alpha-hydroxy-2-pyridinemethanesulfonate.
- Treatment
- alpha-hydroxy-2-pyridinemethanesulfonatee0
- Outcome
- respiration of glycolic acide0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The respiration of glycolic acid was inhibited by alpha-hydroxy-2-pyridinemethanesulfonate”
t0“Maize”
Claim · model-written summary
Declining light caused greater and faster CO(2) efflux in glycolic-acid-fed leaves than attached leaves.
- Treatment
- declining illuminancee0
- Outcome
- CO(2) effluxe0
- Direction
- larger and promptere0
- Comparator
- attached leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“declining illuminance caused a larger and prompter CO(2) efflux from leaves fed glycolic acid than from attached leaves”
t0“Maize”
Claim · model-written summary
Glycolic acid plus urea treatment increased CO(2) release relative to glycolic acid controls in bright light.
- Treatment
- glycolic acid plus 3-(p-chlorophenyl)-1, 1-dimethyl ureae0
- Outcome
- CO(2)e0
- Direction
- moree0
- Comparator
- controls fed glycolic acide0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves fed glycolic acid plus 3-(p-chlorophenyl)-1, 1-dimethyl urea released more CO(2) into CO(2)-free air in bright light than did controls fed glycolic acid”
t0“Maize”
The same questions in other papers
co2 · physiology: respiration · Zea mays (maize)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
light · physiology: respiration · Zea mays (maize)Positive and negative results
2 in the opposite direction
- 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.