Abstract
Plants may alter their growth pattern in response to being grown in elevated CO 2 concentrations. The nature of the change in carbon partitioning underlying those alterations was investigated in Phaseolus vulgaris cv. Gold Crop grown to the third trifoliate leaf stage in CO 2 concentrations of 380, 800, and 1400 ppm. There was no effect of the CO 2 concentration on plant height, leaf area, or dry weight, but the specific leaf weight increased significantly with the CO 2 , concentration, indicating a denser leaf structure. The starch content of the leaves also increased significantly as the CO 2 level increased. A primary leaf was pulse labelled with 14 CO 2 and the depletion of label from that source leaf was monitored with a GM tube. The depletion of the count rate with time was described by a nonlinear curve fitting procedure that allowed the derivation of rate constants to describe the partitioning of carbon in a two-compartment model. Rates of carbon storage decreased in the light with increasing CO 2 concentrations with no effect on the rates of export or remobilization. Both export and storage were reduced in the dark at all CO 2 levels, with an increase in the residence time of carbon in the export pool. Reducing the CO 2 concentration around the source leaf just after labelling did not change carbon partitioning compared to controls. Increasing the CO 2 concentration around the source leaf just after labelling increased all carbon flux rates and reduced the residence times in the leaf pools.
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Claims 10
Claim · model-written summary
Elevated CO2 concentrations had no effect on plant height, leaf area or dry weight of Phaseolus vulgaris.
- Taxon
- Phaseolus vulgaris
Phaseolus vulgarise0 - Material
- cv. Gold Crope0
- Organ / stage
- third trifoliate leaf stagee0
- Treatment
- CO 2 concentrations of 380, 800, and 1400 ppme0
- Outcome
- plant height, leaf area, or dry weighte1
- Direction
- no effecte1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phaseolus vulgaris cv. Gold Crop grown to the third trifoliate leaf stage in CO 2 concentrations of 380, 800, and 1400 ppm”
e1“There was no effect of the CO2 concentration on plant height, leaf area, or dry weight”
Claim · model-written summary
Specific leaf weight increased significantly with rising CO2 concentration, indicating a denser leaf structure.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Treatment
- CO 2 concentrations of 380, 800, and 1400 ppme0
- Outcome
- specific leaf weighte2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phaseolus vulgaris cv. Gold Crop grown to the third trifoliate leaf stage in CO 2 concentrations of 380, 800, and 1400 ppm”
e2“the specific leaf weight increased significantly with the CO 2 , concentration, indicating a denser leaf structure”
Claim · model-written summary
Leaf starch content increased significantly as CO2 level increased.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Organ / stage
- leavese3
- Treatment
- CO 2 levele3
- Outcome
- starch content of the leavese3
- Direction
- increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phaseolus vulgaris cv. Gold Crop grown to the third trifoliate leaf stage in CO 2 concentrations of 380, 800, and 1400 ppm”
e3“The starch content of the leaves also increased significantly as the CO 2 level increased”
Claim · model-written summary
Rates of carbon storage decreased in the light with increasing CO2 concentration.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Treatment
- increasing CO 2 concentrationse4
- Outcome
- Rates of carbon storagee4
- Direction
- decreasede4
- Qualifier
- in the lighte4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phaseolus vulgaris cv. Gold Crop grown to the third trifoliate leaf stage in CO 2 concentrations of 380, 800, and 1400 ppm”
e4“Rates of carbon storage decreased in the light with increasing CO 2 concentrations with no effect on the rates of export or remobilization”
Claim · model-written summary
Rates of carbon export and remobilization showed no effect of increasing CO2 concentration in the light.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Treatment
- increasing CO 2 concentrationse4
- Outcome
- rates of export or remobilizatione4
- Direction
- no effecte4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phaseolus vulgaris cv. Gold Crop grown to the third trifoliate leaf stage in CO 2 concentrations of 380, 800, and 1400 ppm”
e4“Rates of carbon storage decreased in the light with increasing CO 2 concentrations with no effect on the rates of export or remobilization”
Claim · model-written summary
In the dark, export and storage were reduced at all CO2 levels.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Treatment
- in the darke5
- Outcome
- export and storagee5
- Direction
- reducede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phaseolus vulgaris cv. Gold Crop grown to the third trifoliate leaf stage in CO 2 concentrations of 380, 800, and 1400 ppm”
e5“Both export and storage were reduced in the dark at all CO 2 levels, with an increase in the residence time of carbon in the export pool”
Claim · model-written summary
In the dark, the residence time of carbon in the export pool increased.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Treatment
- in the darke5
- Outcome
- residence time of carbon in the export poole5
- Direction
- increasee5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phaseolus vulgaris cv. Gold Crop grown to the third trifoliate leaf stage in CO 2 concentrations of 380, 800, and 1400 ppm”
e5“Both export and storage were reduced in the dark at all CO 2 levels, with an increase in the residence time of carbon in the export pool”
Claim · model-written summary
Reducing CO2 concentration around the source leaf after labelling did not change carbon partitioning compared with controls.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Treatment
- Reducing the CO 2 concentration around the source leaf just after labellinge6
- Outcome
- carbon partitioninge6
- Direction
- did not changee6
- Comparator
- controlse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phaseolus vulgaris cv. Gold Crop grown to the third trifoliate leaf stage in CO 2 concentrations of 380, 800, and 1400 ppm”
e6“Reducing the CO 2 concentration around the source leaf just after labelling did not change carbon partitioning compared to controls”
Claim · model-written summary
Increasing CO2 concentration around the source leaf after labelling increased all carbon flux rates.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Treatment
- Increasing the CO 2 concentration around the source leaf just after labellinge7
- Outcome
- all carbon flux ratese7
- Direction
- increasede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phaseolus vulgaris cv. Gold Crop grown to the third trifoliate leaf stage in CO 2 concentrations of 380, 800, and 1400 ppm”
e7“Increasing the CO 2 concentration around the source leaf just after labelling increased all carbon flux rates and reduced the residence times in the leaf pools”
Claim · model-written summary
Increasing CO2 concentration around the source leaf after labelling reduced residence times in the leaf pools.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarise0
- Treatment
- Increasing the CO 2 concentration around the source leaf just after labellinge7
- Outcome
- residence times in the leaf poolse7
- Direction
- reducede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phaseolus vulgaris cv. Gold Crop grown to the third trifoliate leaf stage in CO 2 concentrations of 380, 800, and 1400 ppm”
e7“Increasing the CO 2 concentration around the source leaf just after labelling increased all carbon flux rates and reduced the residence times in the leaf pools”
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See all 22 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.