Abstract
Seed yield and photosynthetic responses of soybean (Glycine max L. Merr. ’Ransom’) were studied in growth chambers at day/night temperatures of 18/12, 22/16, and 26/20 °C and atmospheric CO 2 concentrations of 350, 675 and 1000 μL L −1 . No seeds were produced at 18/12 °C within any of the CO 2 concentrations. Numbers of pods and seeds increased with increasing temperature and CO 2 levels. Carbon dioxide enrichment increased seed yield of soybean grown at moderately cool temperatures. This increase was associated with an increase in net photosynthetic rate. Leaf photosynthesis in response to CO 2 enrichment increased more at 22/16 °C than at 26/20 °C. Increases in temperature and CO 2 levels enhanced total growth of plants but hastened senescence of leaves. The extended photosynthetic capacity at cool temperatures did not result in allocating more dry matter to developing pods. CO 2 enrichment at 26/20 °C resulted in greater seed yield increases than CO 2 enrichment at lower temperatures.Key words: Soybean yield, low temperature, CO 2 × temperature
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Claims 10
Claim · model-written summary
No seeds formed at 18/12 °C at any tested CO2 level.
- Taxon
- soybean
Glycine maxt0 - Treatment
- 18/12 °Ce0
- Outcome
- No seeds were producede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No seeds were produced at 18/12 °C within any of the CO 2 concentrations”
t0“SOYBEAN”
Claim · model-written summary
Pod numbers increased as temperature and CO2 increased.
- Taxon
- soybeanGlycine maxt0
- Treatment
- increasing temperature and CO 2 levelse0
- Outcome
- Numbers of podse0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Numbers of pods and seeds increased with increasing temperature and CO 2 levels”
t0“SOYBEAN”
Claim · model-written summary
Seed numbers increased as temperature and CO2 increased.
- Taxon
- soybeanGlycine maxt0
- Treatment
- increasing temperature and CO 2 levelse0
- Outcome
- seedse0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Numbers of pods and seeds increased with increasing temperature and CO 2 levels”
t0“SOYBEAN”
Claim · model-written summary
CO2 enrichment increased soybean seed yield at moderately cool temperatures.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Carbon dioxide enrichmente0
- Outcome
- seed yielde0
- Direction
- increasede0
- Qualifier
- moderately cool temperaturese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Carbon dioxide enrichment increased seed yield of soybean grown at moderately cool temperatures”
Claim · model-written summary
The yield increase with CO2 enrichment was associated with increased net photosynthetic rate.
- Taxon
- soybeanGlycine maxt0
- Treatment
- CO2 ENRICHMENTt0
- Outcome
- net photosynthetic ratee0
- Direction
- increasee0
- Qualifier
- associated with an increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This increase was associated with an increase in net photosynthetic rate”
t0“CO2 ENRICHMENT ON SOYBEAN”
Claim · model-written summary
CO2 enrichment raised leaf photosynthesis more at 22/16 °C than at 26/20 °C.
- Taxon
- soybeanGlycine maxt0
- Treatment
- CO 2 enrichmente0
- Outcome
- Leaf photosynthesise0
- Direction
- increased moree0
- Qualifier
- 22/16 °Ce0
- Comparator
- 26/20 °Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf photosynthesis in response to CO 2 enrichment increased more at 22/16 °C than at 26/20 °C”
t0“SOYBEAN”
Claim · model-written summary
Higher temperature and CO2 enhanced total plant growth.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Increases in temperature and CO 2 levelse0
- Outcome
- total growth of plantse0
- Direction
- enhancede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increases in temperature and CO 2 levels enhanced total growth of plants”
t0“SOYBEAN”
Claim · model-written summary
Higher temperature and CO2 hastened leaf senescence.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Increases in temperature and CO 2 levelse0
- Outcome
- senescence of leavese0
- Direction
- hastenede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increases in temperature and CO 2 levels enhanced total growth of plants but hastened senescence of leaves”
t0“SOYBEAN”
Claim · model-written summary
Extended photosynthetic capacity at cool temperatures did not increase dry matter allocation to developing pods.
- Taxon
- soybeanGlycine maxt0
- Outcome
- allocating more dry matter to developing podse0
- Direction
- did not result ine0
- Qualifier
- cool temperaturese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The extended photosynthetic capacity at cool temperatures did not result in allocating more dry matter to developing pods”
t0“SOYBEAN”
Claim · model-written summary
CO2 enrichment increased seed yield more at 26/20 °C than at lower temperatures.
- Taxon
- soybeanGlycine maxt0
- Treatment
- CO 2 enrichment at 26/20 °Ce0
- Outcome
- seed yielde0
- Direction
- greatere0
- Qualifier
- 26/20 °Ce0
- Comparator
- CO 2 enrichment at lower temperaturese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO 2 enrichment at 26/20 °C resulted in greater seed yield increases than CO 2 enrichment at lower temperatures”
t0“SOYBEAN”
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