Abstract
High-temperature stress during the grain-filling stage reduces grain quality of rice, and this is a serious problem in Japan, especially in the Kyushu region. To solve this problem, various heat-tolerant cultivars have been bred, such as ‘Nikomaru’, ‘Kumasannochikara’, ‘Genkitsukushi’, ‘Sagabiyori’, and ‘Otentosodachi’. When cultivated under high temperature after flowering, these heat-tolerant cultivars had lower percentages of chalky grains than in the heat-sensitive cultivar ‘Hinohikari’. All the heat-tolerant cultivars markedly decreased the nonstructural carbohydrate content in the stem under the high temperature compared to control condition during early grain-filling stage, which is considered to be a common trait of heat tolerance. Notably, ‘Sagabiyori’, ‘Genkitsukushi’, and ‘Nikomaru’ maintained a nucellar epidermis at 17 days after flowering (DAF) under high temperature, whereas the nucellar epidermis disappeared in ‘Hinohikari’. In addition, the expression of AGPS2b, thought to be a rate-limiting enzyme in starch synthesis, in ‘Kumasannochikara’, ‘Otentosodachi’, and ‘Nikomaru’ did not decrease under high temperature, whereas ‘Hinohikari’, ‘Sagabiyori’, and ‘Genkitsukushi’ could not maintain expression of the gene at 17 DAF. Moreover, the expression of Amy3E, a starch-degradation-related gene considered to induce grain chalkiness, in ‘Kumasannochikara’ at 17 DAF was not increased by high temperature. These results suggest that the heat-stress-tolerant cultivars have various mechanisms for dealing with high-temperature stress.
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Claims 7
Claim · model-written summary
Heat-tolerant rice cultivars had lower percentages of chalky grains than the heat-sensitive cultivar Hinohikari when cultivated under high temperature after flowering.
- Taxon
- rice
Oryza sativae0 - Treatment
- high temperature after floweringe1
- Outcome
- percentages of chalky grainse1
- Direction
- lowere1
- Comparator
- heat-sensitive cultivar ‘Hinohikari’e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High-temperature stress during the grain-filling stage reduces grain quality of rice”
e1“When cultivated under high temperature after flowering, these heat-tolerant cultivars had lower percentages of chalky grains than in the heat-sensitive cultivar ‘Hinohikari’”
Claim · model-written summary
All heat-tolerant rice cultivars markedly decreased stem nonstructural carbohydrate content under high temperature compared with control condition during early grain filling.
- Taxon
- riceOryza sativae0
- Organ / stage
- steme2
- Treatment
- high temperaturee2
- Outcome
- nonstructural carbohydrate contente2
- Direction
- decreasede2
- Comparator
- control conditione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High-temperature stress during the grain-filling stage reduces grain quality of rice”
e2“All the heat-tolerant cultivars markedly decreased the nonstructural carbohydrate content in the stem under the high temperature compared to control condition during early grain-filling stage”
Claim · model-written summary
Sagabiyori, Genkitsukushi and Nikomaru maintained nucellar epidermis at 17 DAF under high temperature.
- Taxon
- riceOryza sativae0
- Material
- ‘Sagabiyori’, ‘Genkitsukushi’, and ‘Nikomaru’e3
- Organ / stage
- nucellar epidermise3
- Treatment
- high temperaturee3
- Outcome
- nucellar epidermise3
- Direction
- maintainede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High-temperature stress during the grain-filling stage reduces grain quality of rice”
e3“Notably, ‘Sagabiyori’, ‘Genkitsukushi’, and ‘Nikomaru’ maintained a nucellar epidermis at 17 days after flowering (DAF) under high temperature”
Claim · model-written summary
The nucellar epidermis disappeared in heat-sensitive Hinohikari at 17 DAF under high temperature.
- Taxon
- riceOryza sativae0
- Material
- ‘Hinohikari’e4
- Outcome
- nucellar epidermis disappearede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High-temperature stress during the grain-filling stage reduces grain quality of rice”
e4“whereas the nucellar epidermis disappeared in ‘Hinohikari’”
Claim · model-written summary
AGPS2b expression did not decrease under high temperature in Kumasannochikara, Otentosodachi and Nikomaru.
- Taxon
- riceOryza sativae0
- Material
- ‘Kumasannochikara’, ‘Otentosodachi’, and ‘Nikomaru’e5
- Treatment
- high temperaturee5
- Gene
- AGPS2be5
- Outcome
- expressione5
- Direction
- did not decreasee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High-temperature stress during the grain-filling stage reduces grain quality of rice”
e5“the expression of AGPS2b, thought to be a rate-limiting enzyme in starch synthesis, in ‘Kumasannochikara’, ‘Otentosodachi’, and ‘Nikomaru’ did not decrease under high temperature, whereas ‘Hinohikari’, ‘Sagabiyori’, and ‘Genkitsukushi’ could not maintain expression of the gene at 17 DAF”
Claim · model-written summary
AGPS2b expression could not be maintained at 17 DAF in Hinohikari, Sagabiyori and Genkitsukushi.
- Taxon
- riceOryza sativae0
- Material
- ‘Hinohikari’, ‘Sagabiyori’, and ‘Genkitsukushi’e5
- Organ / stage
- 17 DAFe5
- Gene
- AGPS2be5
- Outcome
- expression of the genee5
- Direction
- could not maintaine5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High-temperature stress during the grain-filling stage reduces grain quality of rice”
e5“the expression of AGPS2b, thought to be a rate-limiting enzyme in starch synthesis, in ‘Kumasannochikara’, ‘Otentosodachi’, and ‘Nikomaru’ did not decrease under high temperature, whereas ‘Hinohikari’, ‘Sagabiyori’, and ‘Genkitsukushi’ could not maintain expression of the gene at 17 DAF”
Claim · model-written summary
Amy3E expression at 17 DAF in Kumasannochikara was not increased by high temperature.
- Taxon
- riceOryza sativae0
- Material
- ‘Kumasannochikara’e6
- Treatment
- high temperaturee6
- Gene
- Amy3Ee6
- Outcome
- expression of Amy3Ee6
- Direction
- was not increasede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High-temperature stress during the grain-filling stage reduces grain quality of rice”
e6“the expression of Amy3E, a starch-degradation-related gene considered to induce grain chalkiness, in ‘Kumasannochikara’ at 17 DAF was not increased by high temperature”
The same questions in other papers
heat · quality: sugar starch · Oryza sativa (rice)Results differ
4 papers in the same direction as this paper · 35 in the opposite direction
- negative
- negative
- negative
36 papers more in this group
See all 40 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.