Abstract
ABSTRACT Although enhancement of sink capacity with heavy-panicle is an important approach to the improvement of yield potential in super rice (Oryza sativa L.) breeding, environmental fluctuations may greatly affect fertilization and grain filling of heavy-panicle rice. Here, we investigated the response of heavy-panicle rice varieties to high temperature at flowering and grain filling stages under field conditions, with a focus on spikelets positions on the panicle. Six varieties each with four staggered sowings were grown under various climatic conditions, and thus their flowering stages and grain filling stages experienced high or normal temperature weather scenarios. When rice varieties grown under high temperature, spikelet fertilities increased in all tested varieties. Grain weights of varieties CW2221, K106 and R-2 under high temperature stress showed an average of 10.81% increase compared with normal temperature, whereas 'C418', 'J1307' and 'Xianghui210' decreased by 15.21%. Head milled rice rates significantly decreased, but chalky grain rates and chalkiness degrees significantly increased under high temperature. We further demonstrated that the effects of high temperature on spikelet fertility, grain weight and grain qualities were correlated with grain positions. These results indicate that understanding effects of high temperature on grain weight and quality in heavy-panicle rice varieties is a key factor for super rice breeding in the future.
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Claims 7
Claim · model-written summary
High temperature increased spikelet fertility in all tested rice varieties.
- Taxon
- rice
Oryza sativae0 - Treatment
- high temperaturee0
- Outcome
- spikelet fertilitiese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When rice varieties grown under high temperature, spikelet fertilities increased in all tested varieties”
Claim · model-written summary
High temperature increased grain weight by an average 10.81% in CW2221, K106 and R-2 relative to normal temperature.
Verbatim
e0“Grain weights of varieties CW2221, K106 and R-2 under high temperature stress showed an average of 10.81% increase compared with normal temperature”
Claim · model-written summary
High temperature decreased grain weight by 15.21% in C418, J1307 and Xianghui210.
- Taxon
- riceOryza sativat0
- Material
- 'C418', 'J1307' and 'Xianghui210'e0
- Treatment
- high temperature stresse1
- Outcome
- Grain weightse1
- Direction
- decreasede0
- Value
- 15.21%e0
- Comparator
- normal temperaturee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whereas 'C418', 'J1307' and 'Xianghui210' decreased by 15.21%”
e1“Grain weights of varieties CW2221, K106 and R-2 under high temperature stress showed an average of 10.81% increase compared with normal temperature”
t0“rice varieties”
Claim · model-written summary
High temperature significantly decreased head milled rice rates.
- Taxon
- riceOryza sativat0
- Treatment
- high temperaturee0
- Outcome
- Head milled rice ratese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Head milled rice rates significantly decreased, but chalky grain rates and chalkiness degrees significantly increased under high temperature”
t0“rice varieties”
Claim · model-written summary
High temperature significantly increased chalky grain rates.
- Taxon
- riceOryza sativat0
- Treatment
- high temperaturee0
- Outcome
- chalky grain ratese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Head milled rice rates significantly decreased, but chalky grain rates and chalkiness degrees significantly increased under high temperature”
t0“rice varieties”
Claim · model-written summary
High temperature significantly increased chalkiness degrees.
- Taxon
- riceOryza sativat0
- Treatment
- high temperaturee0
- Outcome
- chalkiness degreese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Head milled rice rates significantly decreased, but chalky grain rates and chalkiness degrees significantly increased under high temperature”
t0“rice varieties”
Claim · model-written summary
Heat effects on spikelet fertility, grain weight and grain quality were correlated with grain position.
- Taxon
- riceOryza sativat0
- Organ / stage
- grain positionse0
- Outcome
- effects of high temperature on spikelet fertility, grain weight and grain qualitiese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effects of high temperature on spikelet fertility, grain weight and grain qualities were correlated with grain positions”
t0“rice varieties”
The same questions in other papers
heat · organism · Oryza sativa (rice)Positive and negative results
9 papers in the same direction as this paper · 4 in the opposite direction
- positive
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