Abstract
The purpose of this experiment was to determine how respiration of soybeans may respond to potential increases in atmospheric carbon dioxide concentration and growth temperature. Three cultivars of soybeans (Glycine max L. Merr.), from maturity groups 00, IV, and VIII, were grown at 370, 555 and 740 cm$ m -$ carbon dioxide concentrations at 20\15, 25\20, and 31\26 mC day ight temperatures. Rates of carbon dioxide efflux in the dark were measured for whole plants several times during exponential growth. These measurements were made at the night temperature and the carbon dioxide concentration at which the plants were grown. For the lowest and highest temperature treatments, the short term response of respiration rate to measurement at the three growth carbon dioxide concentrations was also determined. Elemental analysis of the tissue was used to estimate the growth conversion efficiency. This was combined with the observed relative growth rates to estimate growth respiration. Maintenance respiration was estimated as the difference between growth respiration and total respiration. Respiration rates were generally sensitive to short term changes in the measurement carbon dioxide concentration for plants grown at the lowest, but not the highest carbon dioxide concentration. At all temperatures, growth at elevated carbon dioxide concentrations decreased total respiration measured at the growth concentration, with no significant differences among cultivars. Total respiration increased very little with increasing growth temperature, despite an increase in relative growth rate. Growth respiration was not affected by carbon dioxide treatment at any temperature, but increased with temperature because of the increase in relative growth rate. Values calculated for maintenance respiration decreased with increasing carbon dioxide concentration and also decreased with increasing temperature. Calculated values of maintenance respiration were sometimes zero or negative at the warmer temperatures. This suggests that respiration rates measured in the dark may not have reflected average 24-h rates of energy use. The results indicate that increasing atmospheric carbon dioxide concentration may reduce respiration in soybeans, and respiration may be insensitive to climate warming.
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Claims 14
Claim · model-written summary
Short-term measurement carbon dioxide changes generally affected respiration in plants grown at the lowest carbon dioxide concentration.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- short term changes in the measurement carbon dioxide concentratione0
- Outcome
- Respiration ratese0
- Qualifier
- plants grown at the loweste0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Respiration rates were generally sensitive to short term changes in the measurement carbon dioxide concentration for plants grown at the lowest, but not the highest carbon dioxide concentration.”
t0“Soybean”
Claim · model-written summary
Respiration in plants grown at the highest carbon dioxide concentration was generally insensitive to short-term measurement carbon dioxide changes.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- short term changes in the measurement carbon dioxide concentratione0
- Outcome
- Respiration ratese0
- Qualifier
- not the highest carbon dioxide concentratione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Respiration rates were generally sensitive to short term changes in the measurement carbon dioxide concentration for plants grown at the lowest, but not the highest carbon dioxide concentration.”
t0“Soybean”
Claim · model-written summary
Elevated growth carbon dioxide decreased total respiration at the growth concentration at all temperatures.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- growth at elevated carbon dioxide concentrationse0
- Outcome
- total respiratione0
- Direction
- decreasede0
- Qualifier
- At all temperaturese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At all temperatures, growth at elevated carbon dioxide concentrations decreased total respiration measured at the growth concentration, with no significant differences among cultivars.”
t0“Soybean”
Claim · model-written summary
Cultivars did not differ significantly in total respiration under elevated growth carbon dioxide.
- Taxon
- SoybeanGlycine maxt0
- Material
- cultivarse0
- Outcome
- total respiratione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At all temperatures, growth at elevated carbon dioxide concentrations decreased total respiration measured at the growth concentration, with no significant differences among cultivars.”
t0“Soybean”
Claim · model-written summary
Total respiration increased very little as growth temperature increased.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- increasing growth temperaturee0
- Outcome
- Total respiratione0
- Direction
- increased very littlee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total respiration increased very little with increasing growth temperature, despite an increase in relative growth rate.”
t0“Soybean”
Claim · model-written summary
Relative growth rate increased with growth temperature.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- increasing growth temperaturee0
- Outcome
- relative growth ratee0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total respiration increased very little with increasing growth temperature, despite an increase in relative growth rate.”
t0“Soybean”
Claim · model-written summary
Carbon dioxide treatment did not affect estimated growth respiration at any temperature.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- carbon dioxide treatmente0
- Outcome
- Growth respiratione0
- Direction
- not affectede0
- Qualifier
- at any temperaturee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth respiration was not affected by carbon dioxide treatment at any temperature”
t0“Soybean”
Claim · model-written summary
Estimated growth respiration increased with temperature because relative growth rate increased.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- temperaturee0
- Outcome
- Growth respiratione0
- Direction
- increasede0
- Qualifier
- because of the increase in relative growth ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth respiration was not affected by carbon dioxide treatment at any temperature, but increased with temperature because of the increase in relative growth rate.”
t0“Soybean”
Claim · model-written summary
Calculated maintenance respiration decreased with increasing carbon dioxide concentration.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- increasing carbon dioxide concentratione0
- Outcome
- maintenance respiratione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Values calculated for maintenance respiration decreased with increasing carbon dioxide concentration and also decreased with increasing temperature.”
t0“Soybean”
Claim · model-written summary
Calculated maintenance respiration decreased with increasing temperature.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- increasing temperaturee0
- Outcome
- maintenance respiratione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Values calculated for maintenance respiration decreased with increasing carbon dioxide concentration and also decreased with increasing temperature.”
t0“Soybean”
Claim · model-written summary
Calculated maintenance respiration was sometimes zero or negative at warmer temperatures.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- maintenance respiratione0
- Value
- zero or negativee0
- Qualifier
- sometimes zero or negative at the warmer temperaturese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Calculated values of maintenance respiration were sometimes zero or negative at the warmer temperatures.”
t0“Soybean”
Claim · model-written summary
Dark respiration measurements may not reflect average daily energy use.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- respiration rates measured in the dark may not have reflected average 24-h rates of energy usee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This suggests that respiration rates measured in the dark may not have reflected average 24-h rates of energy use.”
t0“Soybean”
Claim · model-written summary
Increasing atmospheric carbon dioxide may reduce soybean respiration.
- Taxon
- soybeansGlycine maxe0
- Treatment
- increasing atmospheric carbon dioxide concentratione0
- Outcome
- respiratione0
- Direction
- reducee0
- Qualifier
- may reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results indicate that increasing atmospheric carbon dioxide concentration may reduce respiration in soybeans, and respiration may be insensitive to climate warming.”
Claim · model-written summary
Soybean respiration may be insensitive to climate warming.
- Taxon
- soybeansGlycine maxe0
- Treatment
- climate warminge0
- Outcome
- respiratione0
- Direction
- insensitivee0
- Qualifier
- may be insensitivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results indicate that increasing atmospheric carbon dioxide concentration may reduce respiration in soybeans, and respiration may be insensitive to climate warming.”
The same questions in other papers
co2 · physiology: respiration · Glycine max (soybean)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- 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.