Abstract
등숙기 고온이 잎의 생리적 활력과 등숙에 미치는 영향을 알아보고자, 동안과 일품 두 품종을 등숙기에 고온 처리하여 등숙 형질을 분석하고, 잎의 광합성, 엽록소 함량 및 엽록소 a/b율 등을 알아보았다. 등숙기 고온($27{\pm}4^{\circ}C$)처리에서 두 품종 모두 등숙률, 완전립률, 천립중이 감소하였으나 일품은 동안에 비해 모두 감소율이 컸다. 엽록소 함량은 등숙초기 고온에서 적온보다 두 품종 모두 증가하였으며, 등숙중기이후 엽록소감소양상은 온도처리에 따른 차이가 없었다. 엽록소 a/b율은 고온에서 감소하였다가 출수후 15일 이후 증가하였으며 적온에서는 출수 이후 지속적으로 증가하였다. 잎의 단백질농도 변화는 고온에서 등숙초기 약간 높은 경향이었으나 이후 처리 간 차이없이 등숙후기까지 지속적으로 감소하였다. 최대 광합성량은 유숙기인 출수 후 14일에 고온이 적온보다 높았고 출수후 7일과, 등숙후기(출수후 34일)에는 유의한 차이가 없었다. 잎의 유리당 함량은 고온이 적온보다 낮았다. 결론적으로 등숙기 고온은 잎의 생리적 활력을 적온보다 오히려 증가 시켜 엽록소함량과 광합성율이 증가하였으므로, 고온에 의한 이삭의 등숙저하는 이삭으로의 전류나 전분축적기작 과정의 문제가 더 클 것으로 생각된다. High temperature impairs rice grain yield and quality. To understand the effect of high temperature on leaf physiological activity and grain filling, two cultivars of rice that Dongan and Ilpum were exposed to high temperature during ripening stage. Grain filling rate, perfect grain ratio and grain weight of high temperature ($27^{\circ}C{\pm}4^{\circ}C$) treated both rice cultivars were decreased than those of control temperature ($22^{\circ}C{\pm}4^{\circ}C$) treated. The reduction rates of grain filling ratio, perfect grain ratio and grain weight of high temperature treated to control treated rice were higher in Ilpum than Dongan. Chlorophyll contents of rice leaves under high temperature at early ripening stage were higher than those of control temperature, but those were slowly decreased with no difference between temperature treatment since at mid ripening stage. Although chlorophyll a/b ratio under high temperature was decreased from heading to 15 days after heading, that was gradually increased since 15 days after heading. Protein concentrations of rice leaves for ripening stage was a similar pattern with chlorophyll changes. The rate of photosynthesis at 14 days after heading under high temperature was higher than those of control temperature, but there was no difference at those of 7 and 34 days after heading between two temperature treatment. Free sugars under high temperature treated leaves were lower than control temperature. Consequently, these results exhibit that high temperature accelerate leaf physiological activity as chlorophyll synthesis and photosynthesis rate unlike the deterioration of grain filling.
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Claims 11
Claim · model-written summary
High temperature reduced grain filling rate in both rice cultivars.
- Taxon
- Rice
Oryza sativat0 - Treatment
- high temperaturee0
- Outcome
- Grain filling ratee0
- Direction
- decreasede0
- Comparator
- control temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain filling rate, perfect grain ratio and grain weight of high temperature ($27^{\circ}C{\pm}4^{\circ}C$) treated both rice cultivars were decreased than those of control temperature ($22^{\circ}C{\pm}4^{\circ}C$) treated.”
t0“Rice”
Claim · model-written summary
High temperature reduced perfect grain ratio in both rice cultivars.
- Taxon
- RiceOryza sativat0
- Treatment
- high temperaturee0
- Outcome
- perfect grain ratioe0
- Direction
- decreasede0
- Comparator
- control temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain filling rate, perfect grain ratio and grain weight of high temperature ($27^{\circ}C{\pm}4^{\circ}C$) treated both rice cultivars were decreased than those of control temperature ($22^{\circ}C{\pm}4^{\circ}C$) treated.”
t0“Rice”
Claim · model-written summary
High temperature reduced grain weight in both rice cultivars.
- Taxon
- RiceOryza sativat0
- Treatment
- high temperaturee0
- Outcome
- grain weighte0
- Direction
- decreasede0
- Comparator
- control temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain filling rate, perfect grain ratio and grain weight of high temperature ($27^{\circ}C{\pm}4^{\circ}C$) treated both rice cultivars were decreased than those of control temperature ($22^{\circ}C{\pm}4^{\circ}C$) treated.”
t0“Rice”
Claim · model-written summary
Heat-related reductions in grain filling ratio, perfect grain ratio and grain weight were greater in Ilpum than Dongan.
- Taxon
- RiceOryza sativat0
- Material
- Ilpume0
- Outcome
- reduction rates of grain filling ratio, perfect grain ratio and grain weighte0
- Direction
- highere0
- Comparator
- Dongane0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reduction rates of grain filling ratio, perfect grain ratio and grain weight of high temperature treated to control treated rice were higher in Ilpum than Dongan.”
t0“Rice”
Claim · model-written summary
Early ripening heat raised leaf chlorophyll contents relative to control temperature.
- Taxon
- RiceOryza sativat0
- Organ / stage
- rice leavese0
- Treatment
- high temperaturee0
- Outcome
- Chlorophyll contentse0
- Direction
- highere0
- Comparator
- control temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll contents of rice leaves under high temperature at early ripening stage were higher than those of control temperature”
t0“Rice”
Claim · model-written summary
From mid ripening onward, chlorophyll declined with no difference between temperature treatments.
- Taxon
- RiceOryza sativat0
- Outcome
- Chlorophyll contentse1
- Direction
- slowly decreasede0
- Qualifier
- no difference between temperature treatment since at mid ripening stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“those were slowly decreased with no difference between temperature treatment since at mid ripening stage.”
e1“Chlorophyll contents of rice leaves under high temperature at early ripening stage were higher than those of control temperature”
t0“Rice”
Claim · model-written summary
Under heat, chlorophyll a/b ratio fell until 15 days after heading, then increased.
- Taxon
- RiceOryza sativat0
- Treatment
- high temperaturee0
- Outcome
- chlorophyll a/b ratioe0
- Direction
- decreasede0
- Qualifier
- gradually increased since 15 days after headinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although chlorophyll a/b ratio under high temperature was decreased from heading to 15 days after heading, that was gradually increased since 15 days after heading.”
t0“Rice”
Claim · model-written summary
Leaf protein concentrations followed a similar pattern to chlorophyll changes during ripening.
- Taxon
- RiceOryza sativat0
- Organ / stage
- rice leavese0
- Outcome
- Protein concentrations of rice leavese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Protein concentrations of rice leaves for ripening stage was a similar pattern with chlorophyll changes.”
t0“Rice”
Claim · model-written summary
Heat increased photosynthesis rate at 14 days after heading versus control temperature.
- Taxon
- RiceOryza sativat0
- Treatment
- high temperaturee0
- Outcome
- rate of photosynthesise0
- Direction
- highere0
- Qualifier
- 14 days after headinge0
- Comparator
- control temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rate of photosynthesis at 14 days after heading under high temperature was higher than those of control temperature”
t0“Rice”
Claim · model-written summary
Photosynthesis did not differ between temperature treatments at 7 and 34 days after heading.
- Taxon
- RiceOryza sativat0
- Treatment
- high temperaturee0
- Outcome
- rate of photosynthesise0
- Direction
- no differencee0
- Qualifier
- 7 and 34 days after headinge0
- Comparator
- control temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rate of photosynthesis at 14 days after heading under high temperature was higher than those of control temperature, but there was no difference at those of 7 and 34 days after heading between two temperature treatment.”
t0“Rice”
Claim · model-written summary
Heat-treated rice leaves had lower free sugars than controls.
- Taxon
- RiceOryza sativat0
- Organ / stage
- leavese0
- Treatment
- high temperaturee0
- Outcome
- Free sugarse0
- Direction
- lowere0
- Comparator
- control temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Free sugars under high temperature treated leaves were lower than control temperature.”
t0“Rice”
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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.