Abstract
High temperature increases the amount of chalk in rice (Oryza sativa L.) grains, which causes grains to break during polishing, lowering the amount of rice for consumption. Here, we examined the effect of elevated temperature on substrate supply to the panicle, the capacity of the panicle to produce edible grains, and underlying factors affecting yield of edible grain in two varieties. During grain-filling, substrate supply followed a bell shaped curve, and high temperature significantly shortened supply time. The rate of grain-filling did not change and paddy yield fell in both varieties. In high temperature, yield loss in IR8 was due to lighter grains relative to those grown in cool temperature, but in IR60, it was due to the early sacrifice of 30% of the spikelets. The yield of edible rice was zero for IR8 and ~60% for IR60 for the high temperature treatments, and 100% for IR60 and 70% for IR8 in the cool temperature. IR60 differs from IR8 in regulation of substrate supply, architecture of the panicles and the capacity of the panicles to alter sink size in response to the stress and these factors may be responsible for the difference in edible rice in the two varieties.
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Claims 11
Claim · model-written summary
Substrate supply during grain filling followed a bell-shaped curve.
- Taxon
- rice
Oryza sativat0 - Organ / stage
- grain-fillinge0
- Outcome
- substrate supply followed a bell shaped curvee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During grain-filling, substrate supply followed a bell shaped curve”
t0“rice”
Claim · model-written summary
High temperature significantly shortened substrate supply time.
- Taxon
- riceOryza sativat0
- Treatment
- high temperaturee0
- Outcome
- supply timee0
- Direction
- shortenede0
- Comparator
- cool temperaturee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high temperature significantly shortened supply time”
t0“rice”
e1“those grown in cool temperature”
Claim · model-written summary
Grain filling rate did not change under high temperature.
- Taxon
- riceOryza sativat0
- Treatment
- high temperaturee1
- Outcome
- rate of grain-fillinge0
- Direction
- did not changee0
- Comparator
- cool temperaturee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rate of grain-filling did not change”
t0“rice”
e1“high temperature significantly shortened supply time”
e2“those grown in cool temperature”
Claim · model-written summary
Paddy yield fell in both varieties.
- Taxon
- riceOryza sativat0
- Treatment
- high temperaturee1
- Outcome
- paddy yielde0
- Direction
- felle0
- Comparator
- cool temperaturee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“paddy yield fell in both varieties”
t0“rice”
e1“high temperature significantly shortened supply time”
e2“those grown in cool temperature”
Claim · model-written summary
IR8 heat-related yield loss was due to lighter grains than in cool conditions.
- Taxon
- riceOryza sativat0
- Material
- IR8e0
- Outcome
- yield losse0
- Qualifier
- lighter grainse0
- Comparator
- cool temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield loss in IR8 was due to lighter grains relative to those grown in cool temperature”
t0“rice”
Claim · model-written summary
IR60 heat-related yield loss was due to early sacrifice of 30% of spikelets.
- Taxon
- riceOryza sativat0
- Material
- IR60e0
- Organ / stage
- spikeletse0
- Outcome
- early sacrifice of 30% of the spikeletse0
- Value
- 30%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in IR60, it was due to the early sacrifice of 30% of the spikelets”
t0“rice”
Claim · model-written summary
Edible rice yield was zero for IR8 under heat.
- Taxon
- riceOryza sativae0
- Material
- IR8e0
- Treatment
- high temperature treatmentse0
- Outcome
- yield of edible ricee0
- Value
- zeroe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield of edible rice was zero for IR8 and ~60% for IR60 for the high temperature treatments”
Claim · model-written summary
Edible rice yield was about 60% for IR60 under heat.
- Taxon
- riceOryza sativae0
- Material
- IR60e0
- Treatment
- high temperature treatmentse0
- Outcome
- yield of edible ricee0
- Value
- ~60%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield of edible rice was zero for IR8 and ~60% for IR60 for the high temperature treatments”
Claim · model-written summary
Under cool temperature edible rice yield was 100% for IR60.
- Taxon
- riceOryza sativat0
- Material
- IR60e0
- Treatment
- cool temperaturee0
- Outcome
- yield of edible ricee1
- Value
- 100%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“100% for IR60 and 70% for IR8 in the cool temperature”
t0“rice”
e1“yield of edible rice”
Claim · model-written summary
Under cool temperature edible rice yield was 70% for IR8.
- Taxon
- riceOryza sativat0
- Material
- IR8e0
- Treatment
- cool temperaturee0
- Outcome
- yield of edible ricee1
- Value
- 70%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“100% for IR60 and 70% for IR8 in the cool temperature”
t0“rice”
e1“yield of edible rice”
Claim · model-written summary
IR60 and IR8 differ in substrate-supply regulation, panicle architecture and sink-size adjustment.
- Taxon
- riceOryza sativat0
- Material
- IR60e0
- Outcome
- regulation of substrate supply, architecture of the panicles and the capacity of the panicles to alter sink sizee0
- Direction
- differse0
- Comparator
- IR8e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“IR60 differs from IR8 in regulation of substrate supply, architecture of the panicles and the capacity of the panicles to alter sink size in response to the stress”
t0“rice”
The same questions in other papers
heat · yield · Oryza sativa (rice)Positive and negative results
158 papers in the same direction as this paper · 36 in the opposite direction
- negative
- negative
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See all 195 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.