Abstract
Carbon dioxide exchange rates (CER) were measured during seed fill on leaflets of soybean [ Glycine max (L.) Merr. ‘Bragg’] plants grown at 330 and 660 μmol mol −1 CO 2 environments in outdoor growth chambers to investigate their photosynthetic response to light. During midday periods at the R5 growth stage, the plants were submitted to short‐term CO 2 levels ranging from 90 to 990 μmol mo1 −1 to determine differences in leaf photosynthetic response caused by CO 2 acclimation. The data were fitted to a rectangular hyperbola of the Michaelis‐Menten form in which the independent variable was radiation or CO 2 . Light and CO 2 compensation points were calculated from the parameters of the model. Light response curves showed that leaflets grown and measured at 660 μmol mol −1 CO 2 had higher CER asymptotes, higher apparent Michaelis‐Menten constants for light, higher apparent quantum yield, and lower light compensation points than leaflets adapted to and measured at 330 μmol mol −1 CO 2 . The CER‐CO 2 curve parameters also indicated higher asymptotic ceilings of CER at high CO 2 and higher apparent Michaelis‐ Menten constants for CO 2 for the higher CO 2 adapted leaflets. The CO 2 compensation point was significantly lower in leaflets adapted to high CO 2 levels than those adapted to ambient CO 2 , indicating a decrease in photorespiration. It was concluded that, during seed fill, leaflets adapted to high CO 2 environments exhibited a capability to utilize CO 2 and radiation more efficiently at elevated CO 2 and throughout all light levels than leaflets grown at low CO 2 .
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Claims 6
Claim · model-written summary
High CO2 adapted leaflets had higher CER asymptotes, apparent Michaelis-Menten constants for light, and apparent quantum yield.
- Taxon
- soybean
Glycine maxe1 - Treatment
- 660 μmol mol −1 CO 2e0
- Outcome
- CER asymptotes, higher apparent Michaelis‐Menten constants for light, higher apparent quantum yielde0
- Direction
- highere0
- Comparator
- 330 μmol mol −1 CO 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaflets grown and measured at 660 μmol mol −1 CO 2 had higher CER asymptotes, higher apparent Michaelis‐Menten constants for light, higher apparent quantum yield, and lower light compensation points than leaflets adapted to and measured at 330 μmol mol −1 CO 2”
e1“soybean [ Glycine max (L.) Merr. ‘Bragg’]”
Claim · model-written summary
High CO2 adapted leaflets had lower light compensation points.
- Taxon
- soybeanGlycine maxe1
- Treatment
- 660 μmol mol −1 CO 2e2
- Outcome
- light compensation pointse0
- Direction
- lowere0
- Comparator
- 330 μmol mol −1 CO 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lower light compensation points than leaflets adapted to and measured at 330 μmol mol −1 CO 2”
e1“soybean [ Glycine max (L.) Merr. ‘Bragg’]”
e2“leaflets grown and measured at 660 μmol mol −1 CO 2”
Claim · model-written summary
High CO2 adapted leaflets had higher CER asymptotic ceilings at high CO2 and higher apparent constants for CO2.
- Taxon
- soybeanGlycine maxe1
- Treatment
- high CO 2e0
- Outcome
- asymptotic ceilings of CER at high CO 2 and higher apparent Michaelis‐ Menten constants for CO 2e0
- Direction
- highere0
- Comparator
- ambient CO 2e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher asymptotic ceilings of CER at high CO 2 and higher apparent Michaelis‐ Menten constants for CO 2 for the higher CO 2 adapted leaflets”
e1“soybean [ Glycine max (L.) Merr. ‘Bragg’]”
e2“ambient CO 2”
Claim · model-written summary
High CO2 adaptation significantly lowered the CO2 compensation point.
- Taxon
- soybeanGlycine maxe1
- Treatment
- high CO 2 levelse0
- Outcome
- CO 2 compensation pointe0
- Direction
- lowere0
- Comparator
- ambient CO 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The CO 2 compensation point was significantly lower in leaflets adapted to high CO 2 levels than those adapted to ambient CO 2”
e1“soybean [ Glycine max (L.) Merr. ‘Bragg’]”
Claim · model-written summary
Authors interpreted the lower compensation point as decreased photorespiration.
- Taxon
- soybeanGlycine maxe1
- Outcome
- photorespiratione0
- Direction
- decreasee0
- Qualifier
- indicatinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“indicating a decrease in photorespiration”
e1“soybean [ Glycine max (L.) Merr. ‘Bragg’]”
Claim · model-written summary
During seed fill, high CO2 adapted leaflets were concluded to use CO2 and radiation more efficiently at elevated CO2 and all light levels.
- Taxon
- soybeanGlycine maxe1
- Organ / stage
- seed fille0
- Outcome
- utilize CO 2 and radiation more efficientlye0
- Comparator
- leaflets grown at low CO 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“during seed fill, leaflets adapted to high CO 2 environments exhibited a capability to utilize CO 2 and radiation more efficiently at elevated CO 2 and throughout all light levels than leaflets grown at low CO 2”
e1“soybean [ Glycine max (L.) Merr. ‘Bragg’]”
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