Abstract
To evaluate soybean performance in response to high night temperature (HNT), a soybean cultivar, Fukuyutaka, was grown in 2 years under different night temperatures on a mini field in a temperature gradient chamber (TGC) at Kyoto, Japan. The average night temperature ranged from 21.7°C to 23.9°C and from 20.3°C to 22.8°C in 2017 and 2018, respectively. An additional experiment was conducted using a phytotron observing the same cv. under NT as high as 28°C (extreme HNT) and the control at 22 C from a R1 to R6.5 period. In the TGC yield tended to decline by 4.6% per °C when the results from the 2 years were combined. The responses of yield components tended to offset and the harvest index did not respond to varying NT. And thus the decrease in yield by HNT resulted from the change in biomass. The reduction of biomass was attributable more to branch growth than to main stem and more to leaf growth thant to other organs. Leaf area and leaf weight showed responses to NT as convex curves, suggesting that HNT may inhibit leaf growth. Reduction of biomass was more evident by extreme HNT in the phytotron. Pn was not significantly affected by HNT in TGC. The estimated maintenance respiration (Rm) increased with HNT but it seemed to explain the biomass response to HNT only partially. The results suggested that the growth and yield of soybean are potentially affected by increased NT through a negative impact on biomass production caused by multiple factors.
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Claims 11
Claim · model-written summary
Yield tended to decline 4.6% per degree C across two years.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“In the TGC yield tended to decline by 4.6% per °C when the results from the 2 years were combined.”
Claim · model-written summary
Yield component responses tended to offset one another.
- Taxon
- Soybean
Glycine maxt0 - Outcome
- responses of yield componentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“The responses of yield components tended to offset”
Claim · model-written summary
Harvest index did not respond to varying night temperature.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- varying NTe0
- Outcome
- harvest indexe0
- Direction
- did not responde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“the harvest index did not respond to varying NT.”
Claim · model-written summary
The authors attributed the yield decline under high night temperature to biomass change.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- HNTe0
- Outcome
- decrease in yielde0
- Qualifier
- change in biomasse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“the decrease in yield by HNT resulted from the change in biomass.”
Claim · model-written summary
Biomass reduction was more attributable to branch growth than main stem growth.
- Taxon
- SoybeanGlycine maxt0
- Organ / stage
- branche0
- Outcome
- reduction of biomasse0
- Qualifier
- more to branch growth than to main steme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“The reduction of biomass was attributable more to branch growth than to main stem”
Claim · model-written summary
Biomass reduction was more attributable to leaf growth than other organs.
- Taxon
- SoybeanGlycine maxt0
- Organ / stage
- leafe0
- Outcome
- leaf growthe0
- Qualifier
- thant to other organse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“more to leaf growth thant to other organs.”
Claim · model-written summary
Leaf area and weight had convex responses to night temperature.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- NTe0
- Outcome
- Leaf area and leaf weighte0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“Leaf area and leaf weight showed responses to NT as convex curves”
Claim · model-written summary
Extreme high night temperature reduced biomass more evidently in the phytotron.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- extreme HNTe0
- Outcome
- biomasse0
- Direction
- Reductione0
- Setting
- phytotrone0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“Reduction of biomass was more evident by extreme HNT in the phytotron.”
Claim · model-written summary
High night temperature did not significantly affect Pn in the chamber.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- HNTe0
- Outcome
- Pne0
- Setting
- TGCe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“Pn was not significantly affected by HNT in TGC.”
Claim · model-written summary
Estimated maintenance respiration increased with high night temperature.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- HNTe0
- Outcome
- maintenance respiration (Rm)e0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“The estimated maintenance respiration (Rm) increased with HNT”
Claim · model-written summary
The authors judged respiration to explain biomass response only partially.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- HNTe0
- Outcome
- biomass responsee0
- Qualifier
- only partiallye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean”
e0“it seemed to explain the biomass response to HNT only partially.”
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