Abstract
During the period of most active leaf expansion, the foliar dark respiration rate of soybeans (Glycine max cv Williams), grown for 2 weeks in 1000 microliters CO(2) per liter air, was 1.45 milligrams CO(2) evolved per hour leaf density thickness, and this was twice the rate displayed by leaves of control plants (350 microliters CO(2) per liter air). There was a higher foliar nonstructural carbohydrate level (e.g. sucrose and starch) in the CO(2) enriched compared with CO(2) normal plants. For example, leaves of enriched plants displayed levels of nonstructural carbohydrate equivalent to 174 milligrams glucose per gram dry weight compared to the 84 milligrams glucose per gram dry weight found in control plant leaves. As the leaves of CO(2) enriched plants approached full expansion, both the foliar respiration rate and carbohydrate content of the CO(2) enriched leaves decreased until they were equivalent with those same parameters in the leaves of control plants. A strong positive correlation between respiration rate and carbohydrate content was seen in high CO(2) adapted plants, but not in the control plants.Mitochondria, isolated simultaneously from the leaves of CO(2) enriched and control plants, showed no difference in NADH or malate-glutamate dependent O(2) uptake, and there were no observed differences in the specific activities of NAD(+) linked isocitrate dehydrogenase and cytochrome c oxidase. Since the mitochondrial O(2) uptake and total enzyme activities were not greater in young enriched leaves, the increase in leaf respiration rate was not caused by metabolic adaptations in the leaf mitochondria as a response to long term CO(2) enrichment. It was concluded, that the higher respiration rate in the enriched plant's foliage was attributable, in part, to a higher carbohydrate status.
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Claims 9
Claim · model-written summary
Young soybean leaves grown under elevated CO2 respired at twice the control rate.
- Taxon
- soybeans
Glycine maxe0 - Material
- Glycine max cv Williamse0
- Organ / stage
- leavese0
- Treatment
- 1000 microliters CO(2) per liter aire0
- Outcome
- foliar dark respiration ratee0
- Direction
- twicee0
- Value
- 1.45 milligrams CO(2) evolved per hour leaf density thicknesse0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“foliar dark respiration rate of soybeans (Glycine max cv Williams), grown for 2 weeks in 1000 microliters CO(2) per liter air, was 1.45 milligrams CO(2) evolved per hour leaf density thickness, and this was twice the rate displayed by leaves of control plants (350 microliters CO(2) per liter air)”
Claim · model-written summary
Elevated CO2 increased soybean leaf nonstructural carbohydrate content compared with controls.
- Taxon
- soybeansGlycine maxt0
- Treatment
- enrichede0
- Outcome
- nonstructural carbohydratee0
- Direction
- enrichede0
- Value
- 174 milligrams glucose per gram dry weighte0
- Qualifier
- 84 milligrams glucose per gram dry weighte0
- Comparator
- control plant leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaves of enriched plants displayed levels of nonstructural carbohydrate equivalent to 174 milligrams glucose per gram dry weight compared to the 84 milligrams glucose per gram dry weight found in control plant leaves”
t0“Effects of CO2 Enrichment and Carbohydrate Content on the Dark Respiration of Soybeans”
Claim · model-written summary
As elevated-CO2 leaves neared full expansion, their respiration rate declined to the control level.
- Taxon
- soybeansGlycine maxt0
- Organ / stage
- full expansione0
- Treatment
- CO(2) enrichede0
- Outcome
- foliar respiration ratee0
- Direction
- decreasede0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As the leaves of CO(2) enriched plants approached full expansion, both the foliar respiration rate and carbohydrate content of the CO(2) enriched leaves decreased until they were equivalent with those same parameters in the leaves of control plants”
t0“Effects of CO2 Enrichment and Carbohydrate Content on the Dark Respiration of Soybeans”
Claim · model-written summary
As elevated-CO2 leaves neared full expansion, their carbohydrate content declined to the control level.
- Taxon
- soybeansGlycine maxt0
- Treatment
- CO(2) enrichede0
- Outcome
- carbohydrate contente0
- Direction
- decreasede0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the foliar respiration rate and carbohydrate content of the CO(2) enriched leaves decreased until they were equivalent with those same parameters in the leaves of control plants”
t0“Effects of CO2 Enrichment and Carbohydrate Content on the Dark Respiration of Soybeans”
Claim · model-written summary
Leaf respiration and carbohydrate content were strongly positively correlated in high-CO2-adapted soybean plants.
- Taxon
- soybeansGlycine maxt0
- Treatment
- high CO(2)e0
- Outcome
- respiration rate and carbohydrate contente0
- Direction
- positive correlatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A strong positive correlation between respiration rate and carbohydrate content was seen in high CO(2) adapted plants”
t0“Effects of CO2 Enrichment and Carbohydrate Content on the Dark Respiration of Soybeans”
Claim · model-written summary
The respiration–carbohydrate correlation was absent in control plants.
- Taxon
- soybeansGlycine maxt0
- Outcome
- respiration rate and carbohydrate contente0
- Direction
- note0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A strong positive correlation between respiration rate and carbohydrate content was seen in high CO(2) adapted plants, but not in the control plants”
t0“Effects of CO2 Enrichment and Carbohydrate Content on the Dark Respiration of Soybeans”
Claim · model-written summary
Mitochondrial NADH- and malate-glutamate-dependent oxygen uptake did not differ between enriched and control leaves.
- Taxon
- soybeansGlycine maxt0
- Treatment
- CO2 Enrichmentt0
- Outcome
- NADH or malate-glutamate dependent O(2) uptakee0
- Direction
- no differencee0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mitochondria, isolated simultaneously from the leaves of CO(2) enriched and control plants, showed no difference in NADH or malate-glutamate dependent O(2) uptake”
t0“Effects of CO2 Enrichment and Carbohydrate Content on the Dark Respiration of Soybeans”
Claim · model-written summary
Isocitrate dehydrogenase and cytochrome c oxidase specific activities did not differ between treatments.
- Taxon
- soybeansGlycine maxt0
- Treatment
- CO2 Enrichmentt0
- Gene
- NAD(+) linked isocitrate dehydrogenase and cytochrome c oxidasee0
- Outcome
- specific activitiese0
- Direction
- no observed differencese0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mitochondria, isolated simultaneously from the leaves of CO(2) enriched and control plants, showed no difference in NADH or malate-glutamate dependent O(2) uptake, and there were no observed differences in the specific activities of NAD(+) linked isocitrate dehydrogenase and cytochrome c oxidase”
t0“Effects of CO2 Enrichment and Carbohydrate Content on the Dark Respiration of Soybeans”
Claim · model-written summary
The authors attributed part of elevated-CO2 leaf respiration to higher carbohydrate status.
- Taxon
- soybeansGlycine maxt0
- Treatment
- enrichede0
- Compound
- carbohydratee0
- Outcome
- higher respiration ratee0
- Qualifier
- in parte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the higher respiration rate in the enriched plant's foliage was attributable, in part, to a higher carbohydrate status”
t0“Effects of CO2 Enrichment and Carbohydrate Content on the Dark Respiration of Soybeans”
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See all 27 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.