Abstract
Abstract Using controlled environmental growth chambers, whole plants of soybean, cv. ‘Clark’, were examined during early development (7–20 days after sowing) at both ambient (≈ 350 μL L –1 ) and elevated (≈ 700 μL L –1 ) carbon dioxide and a range of air temperatures (20, 25, 30, and 35 °C) to determine if future climatic change (temperature or CO 2 concentration) could alter the ratio of carbon lost by dark respiration to that gained via photosynthesis. Although whole‐plant respiration increased with short‐term increases in the measurement temperature, respiration acclimated to increasing growth temperature. Respiration, on a dry weight basis, was either unchanged or lower for the elevated CO 2 grown plants, relative to ambient CO 2 concentration, over the range of growth temperatures. Levels of both starch and sucrose increased with elevated CO 2 concentration, but no interaction between CO 2 and growth temperature was observed. Relative growth rate increased with elevated CO 2 concentration up to a growth temperature of 35 °C. The ratio of respiration to photosynthesis rate over a 24‐h period during early development was not altered over the growth temperatures (20–35 °C) and was consistently less at the elevated relative to the ambient CO 2 concentration. The current experiment does not support the proposition that global increases in carbon dioxide and temperature will increase the ratio of respiration to photosynthesis; rather, the data suggest that some plant species may continue to act as a sink for carbon even if carbon dioxide and temperature increase simultaneously.
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Claims 9
Claim · model-written summary
Whole plant respiration increased with short term measurement temperature.
- Taxon
- soybean
Glycine maxt0 - Treatment
- short‐term increases in the measurement temperaturee0
- Outcome
- whole‐plant respiratione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean seedlings”
e0“whole‐plant respiration increased with short‐term increases in the measurement temperature”
Claim · model-written summary
Respiration acclimated to increasing growth temperature.
- Taxon
- soybeanGlycine maxt0
- Outcome
- respiration acclimated to increasing growth temperaturee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean seedlings”
e0“respiration acclimated to increasing growth temperature”
Claim · model-written summary
Dry weight based respiration was unchanged or lower under elevated CO2 than ambient CO2 across growth temperatures.
- Taxon
- soybeanGlycine maxt0
- Treatment
- elevated CO 2e0
- Outcome
- Respiration, on a dry weight basise0
- Direction
- unchanged or lowere0
- Qualifier
- over the range of growth temperaturese0
- Comparator
- ambient CO 2 concentratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean seedlings”
e0“Respiration, on a dry weight basis, was either unchanged or lower for the elevated CO 2 grown plants, relative to ambient CO 2 concentration, over the range of growth temperatures”
Claim · model-written summary
Starch increased under elevated CO2.
- Taxon
- soybeanGlycine maxt0
- Treatment
- elevated CO 2 concentratione0
- Outcome
- starche0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean seedlings”
e0“Levels of both starch and sucrose increased with elevated CO 2 concentration”
Claim · model-written summary
Sucrose increased under elevated CO2.
- Taxon
- soybeanGlycine maxt0
- Treatment
- elevated CO 2 concentratione0
- Outcome
- sucrosee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean seedlings”
e0“Levels of both starch and sucrose increased with elevated CO 2 concentration”
Claim · model-written summary
No CO2 by growth temperature interaction was observed for starch and sucrose levels.
- Taxon
- soybeanGlycine maxt0
- Outcome
- interaction between CO 2 and growth temperaturee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean seedlings”
e0“no interaction between CO 2 and growth temperature was observed”
Claim · model-written summary
Elevated CO2 increased relative growth rate up to 35 °C.
- Taxon
- soybeanGlycine maxt0
- Treatment
- elevated CO 2 concentratione0
- Outcome
- Relative growth ratee0
- Direction
- increasede0
- Qualifier
- up to a growth temperature of 35 °Ce0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean seedlings”
e0“Relative growth rate increased with elevated CO 2 concentration up to a growth temperature of 35 °C”
Claim · model-written summary
The 24 hour respiration to photosynthesis ratio was not altered across 20–35 °C growth temperatures.
- Taxon
- soybeanGlycine maxt0
- Treatment
- growth temperatures (20–35 °C)e0
- Outcome
- ratio of respiration to photosynthesis ratee0
- Direction
- not alterede0
- Qualifier
- over a 24‐h period during early developmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean seedlings”
e0“The ratio of respiration to photosynthesis rate over a 24‐h period during early development was not altered over the growth temperatures (20–35 °C)”
Claim · model-written summary
The 24 hour respiration to photosynthesis ratio was lower at elevated CO2 than ambient CO2.
- Taxon
- soybeanGlycine maxt0
- Treatment
- elevatede0
- Outcome
- ratio of respiration to photosynthesis ratee0
- Direction
- lesse0
- Qualifier
- over a 24‐h period during early developmente0
- Comparator
- ambient CO 2 concentratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean seedlings”
e0“The ratio of respiration to photosynthesis rate over a 24‐h period during early development was not altered over the growth temperatures (20–35 °C) and was consistently less at the elevated relative to the ambient CO 2 concentration”
The same questions in other papers
co2 · growth · Glycine max (soybean)Positive and negative results
82 papers in the same direction as this paper · 16 in the opposite direction · 2 reporting no difference from an alternative
- positive
- positive
- positive
97 papers more in this group
See all 101 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.