Abstract
BACKGROUND AND AIMS: Respiration of autotrophs is an important component of their carbon balance as well as the global carbon dioxide budget. How autotrophic respiration may respond to increasing carbon dioxide concentrations, [CO(2)], in the atmosphere remains uncertain. The existence of short-term responses of respiration rates of plant leaves to [CO(2)] is controversial. Short-term responses of respiration to temperature are not disputed. This work compared responses of dark respiration and two processes dependent on the energy and reductant supplied by dark respiration, translocation and nitrate reduction, to changes in [CO(2)] and temperature. METHODS: Mature soybean leaves were exposed for a single 8-h dark period to one of five combinations of air temperature and [CO(2)], and rates of respiration, translocation and nitrate reduction were determined for each treatment. KEY RESULTS: Low temperature and elevated [CO(2)] reduced rates of respiration, translocation and nitrate reduction, while increased temperature and low [CO(2)] increased rates of all three processes. A given change in the rate of respiration was accompanied by the same change in the rate of translocation or nitrate reduction, regardless of whether the altered respiration was caused by a change in temperature or by a change in [CO(2)]. CONCLUSIONS: These results make it highly unlikely that the observed responses of respiration rate to [CO(2)] were artefacts due to errors in the measurement of carbon dioxide exchange rates in this case, and indicate that elevated [CO(2)] at night can affect translocation and nitrate reduction through its effect on respiration.
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Claims 6
Claim · model-written summary
Low temperature reduced soybean leaf respiration, translocation and nitrate reduction.
- Taxon
- Soybean
Glycine maxt0 - Organ / stage
- Leavest0
- Treatment
- Low temperaturee0
- Outcome
- rates of respiration, translocation and nitrate reductione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean Leaves”
e0“Low temperature and elevated [CO(2)] reduced rates of respiration, translocation and nitrate reduction”
Claim · model-written summary
Elevated carbon dioxide reduced soybean leaf respiration, translocation and nitrate reduction.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- elevated [CO(2)]e0
- Outcome
- rates of respiration, translocation and nitrate reductione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean Leaves”
e0“Low temperature and elevated [CO(2)] reduced rates of respiration, translocation and nitrate reduction”
Claim · model-written summary
Increased temperature increased all three soybean leaf processes.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- increased temperaturee0
- Outcome
- rates of all three processese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean Leaves”
e0“increased temperature and low [CO(2)] increased rates of all three processes”
Claim · model-written summary
Low carbon dioxide increased all three soybean leaf processes.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- low [CO(2)]e0
- Outcome
- rates of all three processese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean Leaves”
e0“increased temperature and low [CO(2)] increased rates of all three processes”
Claim · model-written summary
Changes in soybean leaf respiration accompanied the same changes in translocation or nitrate reduction regardless of the altered environmental factor.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- change in temperaturee0
- Outcome
- rate of translocation or nitrate reductione0
- Direction
- same changee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean Leaves”
e0“A given change in the rate of respiration was accompanied by the same change in the rate of translocation or nitrate reduction, regardless of whether the altered respiration was caused by a change in temperature or by a change in [CO(2)]”
Claim · model-written summary
Elevated nighttime carbon dioxide can affect soybean translocation and nitrate reduction through its effect on respiration.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- elevated [CO(2)] at nighte0
- Outcome
- translocation and nitrate reductione0
- Qualifier
- through its effect on respiratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean Leaves”
e0“elevated [CO(2)] at night can affect translocation and nitrate reduction through its effect on respiration”
The same questions in other papers
co2 · physiology: respiration · Glycine max (soybean)Positive and negative results
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- positive
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3 papers in the same direction as this paper · 1 in the opposite direction
- positive
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1 paper more in this group
See all 5 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.