Abstract
To estimate impact of high temperature stress on photosynthetic characteristic and yield in rice (Oryza sativa L.), a pot experiment was conducted during 2008 in environment-controlled chambers with two rice cultivars (Yangdao 6 and Nanjing 44) under high temperature stresses (35°C/3d, 35°C/5d, 39°C/3d and 39°C/5d) at heading. The results showed that rice grain yield, chlorophyll content, net photosynthetic rate (NPn), superoxide dismutase content (SOD) and leaf area index (LAI) presented a sharply decline, and the relative conductivity, malondialdehyde content (MDA) increased gradually with the elevation of stress temperature and extension of stress time. The increasing rate (reduction rate) of some physiological and biochemical indexes in Yangdao 6 were lower than that in Nanjing 44 compared with the CK under the same temperature stress. It was showed that response of Nanjing 44 to high temperature was stronger than that of Yangdao 6. In accordance with correlation analysis, the rice grain yield showed a positive correlation with NPn and LAI (P<0.01), and the correlation coefficients of them were 0.93 and 0.89 respectively. Further, the correlation between rice grain yield and DW after early stage of maturing, the export percentage of the matter in stem-sheath (EPMSS) and the transformation percentage of the matter in stem-sheath (TPMSS) were not significant. It was showed that rice grain yield under high temperature stress originated mainly from leaves photosynthesis and LAI after heading.
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Claims 12
Claim · model-written summary
Rice grain yield declined sharply with greater heat and duration.
- Taxon
- rice
Oryza sativae0 - Treatment
- elevation of stress temperature and extension of stress timee0
- Outcome
- grain yielde0
- Direction
- sharply declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice grain yield, chlorophyll content, net photosynthetic rate (NPn), superoxide dismutase content (SOD) and leaf area index (LAI) presented a sharply decline, and the relative conductivity, malondialdehyde content (MDA) increased gradually with the elevation of stress temperature and extension of stress time”
Claim · model-written summary
Rice chlorophyll content, net photosynthetic rate and superoxide dismutase content declined sharply with heat.
- Taxon
- riceOryza sativae0
- Treatment
- elevation of stress temperature and extension of stress timee0
- Outcome
- chlorophyll content, net photosynthetic rate (NPn), superoxide dismutase content (SOD)e0
- Direction
- sharply declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice grain yield, chlorophyll content, net photosynthetic rate (NPn), superoxide dismutase content (SOD) and leaf area index (LAI) presented a sharply decline, and the relative conductivity, malondialdehyde content (MDA) increased gradually with the elevation of stress temperature and extension of stress time”
Claim · model-written summary
Rice leaf area index declined sharply with greater heat and duration.
- Taxon
- riceOryza sativae0
- Treatment
- elevation of stress temperature and extension of stress timee0
- Outcome
- leaf area index (LAI)e0
- Direction
- sharply declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice grain yield, chlorophyll content, net photosynthetic rate (NPn), superoxide dismutase content (SOD) and leaf area index (LAI) presented a sharply decline, and the relative conductivity, malondialdehyde content (MDA) increased gradually with the elevation of stress temperature and extension of stress time”
Claim · model-written summary
Relative conductivity and malondialdehyde content increased gradually with heat and duration.
- Taxon
- riceOryza sativae0
- Treatment
- elevation of stress temperature and extension of stress timee0
- Outcome
- relative conductivity, malondialdehyde content (MDA)e0
- Direction
- increased graduallye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice grain yield, chlorophyll content, net photosynthetic rate (NPn), superoxide dismutase content (SOD) and leaf area index (LAI) presented a sharply decline, and the relative conductivity, malondialdehyde content (MDA) increased gradually with the elevation of stress temperature and extension of stress time”
Claim · model-written summary
Yangdao 6 showed smaller changes in some physiological and biochemical indexes than Nanjing 44 under the same heat stress.
- Material
- Yangdao 6e0
- Treatment
- same temperature stresse0
- Outcome
- increasing rate (reduction rate) of some physiological and biochemical indexese0
- Direction
- lowere0
- Comparator
- Nanjing 44e0
Not reportedTaxon
Verbatim
e0“The increasing rate (reduction rate) of some physiological and biochemical indexes in Yangdao 6 were lower than that in Nanjing 44 compared with the CK under the same temperature stress”
Claim · model-written summary
Nanjing 44 responded more strongly to high temperature than Yangdao 6.
- Taxon
- riceOryza sativat0
- Material
- Nanjing 44e0
- Outcome
- response of Nanjing 44 to high temperaturee0
- Direction
- strongere0
- Comparator
- Yangdao 6e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“response of Nanjing 44 to high temperature was stronger than that of Yangdao 6”
t0“rice (Oryza sativa)”
Claim · model-written summary
Rice grain yield correlated positively with net photosynthetic rate, r=0.93.
- Taxon
- riceOryza sativae0
- Outcome
- grain yielde0
- Direction
- positive correlatione0
- Value
- 0.93e0
- Comparator
- NPne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice grain yield showed a positive correlation with NPn and LAI (P<0.01), and the correlation coefficients of them were 0.93 and 0.89 respectively”
Claim · model-written summary
Rice grain yield correlated positively with leaf area index, r=0.89.
- Taxon
- riceOryza sativae0
- Outcome
- grain yielde0
- Direction
- positive correlatione0
- Value
- 0.89e0
- Comparator
- LAIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice grain yield showed a positive correlation with NPn and LAI (P<0.01), and the correlation coefficients of them were 0.93 and 0.89 respectively”
Claim · model-written summary
Rice grain yield was not significantly correlated with dry weight after early maturity.
- Taxon
- riceOryza sativae0
- Outcome
- grain yielde0
- Comparator
- DW after early stage of maturinge0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“correlation between rice grain yield and DW after early stage of maturing, the export percentage of the matter in stem-sheath (EPMSS) and the transformation percentage of the matter in stem-sheath (TPMSS) were not significant”
Claim · model-written summary
Rice grain yield was not significantly correlated with export percentage of matter in the stem-sheath.
- Taxon
- riceOryza sativae0
- Outcome
- grain yielde0
- Comparator
- export percentage of the matter in stem-sheath (EPMSS)e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“correlation between rice grain yield and DW after early stage of maturing, the export percentage of the matter in stem-sheath (EPMSS) and the transformation percentage of the matter in stem-sheath (TPMSS) were not significant”
Claim · model-written summary
Rice grain yield was not significantly correlated with transformation percentage of matter in the stem-sheath.
- Taxon
- riceOryza sativae0
- Outcome
- grain yielde0
- Comparator
- transformation percentage of the matter in stem-sheath (TPMSS)e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“correlation between rice grain yield and DW after early stage of maturing, the export percentage of the matter in stem-sheath (EPMSS) and the transformation percentage of the matter in stem-sheath (TPMSS) were not significant”
Claim · model-written summary
The authors infer that heat stressed rice grain yield mainly derives from leaf photosynthesis and leaf area after heading.
- Taxon
- riceOryza sativae0
- Organ / stage
- leavese0
- Outcome
- grain yielde0
- Qualifier
- photosynthesis and LAI after headinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice grain yield under high temperature stress originated mainly from leaves photosynthesis and LAI after heading”
The same questions in other papers
altitude · yield · Oryza sativa (rice)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
altitude · growth · Oryza sativa (rice)Results agree
2 papers in the same direction as this paper
- no effect
- no effect
altitude · physiology: photosynthesis · Oryza sativa (rice)Results agree
2 papers in the same direction as this paper
- negative
- no effect
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.