Abstract
Climate change is recognized to increase the frequency and severity of extreme temperature events. At flowering and grain filling stages, risk of high temperature stress (HTS) on rice might increase, and lead to declining grain yields. A regulated cabinet experiment was carried out to investigate effects of high temperature stress on rice growth at flowering and grain-filling stages. Results showed that no obvious decrease pattern in net photosynthesis appeared along with the temperature rising, but the dry matter allocation in leaf, leaf sheath, culm, and panicle all changed. Dry weight of panicle decreased, and ratio of straw to total above ground crop dry weight increased 6–34% from CK, which might have great effects on carbon cycling and green house gas emission. Grain yield decreased significantly across all treatments on average from 15 to 73%. Occurrence of HTS at flowering stage showed more serious influence on grain yield than at grain filling stage. High temperature stress showed negative effects on harvest index. It might be helpful to provide valuable information for crop simulation models to capture the effects of high temperature stress on rice, and evaluate the high temperature risk.
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Claims 7
Claim · model-written summary
Net photosynthesis showed no obvious decrease as temperature rose.
- Taxon
- Rice
Oryza sativat0 - Treatment
- temperature risinge0
- Outcome
- net photosynthesise0
- Direction
- no obvious decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e0“no obvious decrease pattern in net photosynthesis appeared along with the temperature rising”
Claim · model-written summary
High temperature changed dry matter allocation among leaf, sheath, culm and panicle.
- Taxon
- RiceOryza sativat0
- Organ / stage
- leaf, leaf sheath, culm, and paniclee0
- Treatment
- High Temperature Stresst1
- Outcome
- dry matter allocatione0
- Direction
- changede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
t1“High Temperature Stress”
e0“the dry matter allocation in leaf, leaf sheath, culm, and panicle all changed”
Claim · model-written summary
Panicle dry weight decreased under high temperature stress.
- Taxon
- RiceOryza sativat0
- Organ / stage
- paniclee0
- Treatment
- High Temperature Stresst1
- Outcome
- Dry weight of paniclee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
t1“High Temperature Stress”
e0“Dry weight of panicle decreased”
Claim · model-written summary
Straw share of aboveground dry weight rose 6–34% from CK.
- Taxon
- RiceOryza sativat0
- Treatment
- High Temperature Stresst1
- Outcome
- ratio of straw to total above ground crop dry weighte0
- Direction
- increasede0
- Value
- 6–34%e0
- Comparator
- CKe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
t1“High Temperature Stress”
e0“ratio of straw to total above ground crop dry weight increased 6–34% from CK”
Claim · model-written summary
Grain yield fell significantly by 15 to 73% across heat treatments.
- Taxon
- RiceOryza sativat0
- Treatment
- High Temperature Stresst1
- Outcome
- Grain yielde0
- Direction
- decreasede0
- Value
- 15 to 73%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
t1“High Temperature Stress”
e0“Grain yield decreased significantly across all treatments on average from 15 to 73%”
Claim · model-written summary
Heat at flowering affected grain yield more seriously than heat at grain filling.
- Taxon
- RiceOryza sativat0
- Treatment
- HTS at flowering stagee0
- Outcome
- grain yielde0
- Direction
- more seriouse0
- Comparator
- at grain filling stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e0“Occurrence of HTS at flowering stage showed more serious influence on grain yield than at grain filling stage.”
Claim · model-written summary
High temperature stress negatively affected harvest index.
- Taxon
- RiceOryza sativat0
- Treatment
- High temperature stresse0
- Outcome
- harvest indexe0
- Direction
- negative effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice”
e0“High temperature stress showed negative effects on harvest index.”
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