Abstract
To elucidate the resistance of high-yield hybrid rice (Oryza sativa L.) at the seedling stage to low temperature, photosynthetic characteristics, such as membrane lipid peroxidation, fatty acid composition, and chloroplast ultrastructure, were investigated in a newly developed super-hybrid rice ('Liangyoupeijiu') and a traditional chill-sensitive hybrid rice ('Shanyou63'), with 20°C as the control condition and 10°C as the low temperature treatment. Chlorophyll content, oxygen consumption by photosystem I, and oxygen production by photosystem II in the thylakoid membrane mainly decreased under the low-temperature treatment. The malondialdehyde content of 'Liangyoupeijiu' decreased slightly, while increases in membrane lipid peroxidation were greater in 10°C-treated than in 25°C-treated 'Shanyou63' seedlings. The index of unsaturated fatty acids increased in the two cultivars, particularly in 'Liangyoupeijiu'. No severe chloroplast ultrastructure damage was observed under cold stress, but the number of osmiophilic granules in 'Shanyou63' increased rapidly. The results indicate that compared to 'Shanyou63', 'Liangyoupeijiu' is more chill-resistant at the seedling stage.
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Claims 7
Claim · model-written summary
Under low-temperature treatment compared with the 20°C control, chlorophyll content, PSI oxygen consumption and PSII oxygen production mainly decreased in hybrid rice seedlings.
- Taxon
- hybrid rice
Oryza sativae0 - Organ / stage
- seedling stagee0
- Treatment
- low-temperature treatmente1
- Outcome
- Chlorophyll content, oxygen consumption by photosystem I, and oxygen production by photosystem IIe1
- Direction
- decreasede1
- Qualifier
- mainlye1
- Comparator
- 20°C as the control conditione7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high-yield hybrid rice (Oryza sativa L.) at the seedling stage to low temperature”
e1“Chlorophyll content, oxygen consumption by photosystem I, and oxygen production by photosystem II in the thylakoid membrane mainly decreased under the low-temperature treatment”
e7“with 20°C as the control condition and 10°C as the low temperature treatment”
Claim · model-written summary
Malondialdehyde content of Liangyoupeijiu decreased slightly under low temperature.
- Taxon
- hybrid riceOryza sativae0
- Material
- Liangyoupeijiue2
- Treatment
- low temperature treatmente7
- Outcome
- malondialdehyde contente2
- Direction
- decreasede2
- Qualifier
- slightlye2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high-yield hybrid rice (Oryza sativa L.) at the seedling stage to low temperature”
e2“The malondialdehyde content of 'Liangyoupeijiu' decreased slightly”
e7“with 20°C as the control condition and 10°C as the low temperature treatment”
Claim · model-written summary
Membrane lipid peroxidation was greater in Shanyou63 seedlings at 10°C than at 25°C.
- Taxon
- hybrid riceOryza sativae0
- Material
- Shanyou63e3
- Treatment
- 10°C-treatede3
- Outcome
- membrane lipid peroxidatione3
- Direction
- greatere3
- Comparator
- 25°C-treatede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high-yield hybrid rice (Oryza sativa L.) at the seedling stage to low temperature”
e3“increases in membrane lipid peroxidation were greater in 10°C-treated than in 25°C-treated 'Shanyou63' seedlings”
Claim · model-written summary
The index of unsaturated fatty acids increased in both cultivars under low temperature, particularly in Liangyoupeijiu.
- Taxon
- hybrid riceOryza sativae0
- Material
- two cultivarse4
- Treatment
- low temperature treatmente7
- Outcome
- index of unsaturated fatty acidse4
- Direction
- increasede4
- Qualifier
- particularly in 'Liangyoupeijiu'e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high-yield hybrid rice (Oryza sativa L.) at the seedling stage to low temperature”
e4“The index of unsaturated fatty acids increased in the two cultivars, particularly in 'Liangyoupeijiu'”
e7“with 20°C as the control condition and 10°C as the low temperature treatment”
Claim · model-written summary
No severe chloroplast ultrastructure damage was observed under cold stress in hybrid rice.
- Taxon
- hybrid riceOryza sativae0
- Treatment
- cold stresse5
- Outcome
- chloroplast ultrastructure damagee5
- Qualifier
- No severee5
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high-yield hybrid rice (Oryza sativa L.) at the seedling stage to low temperature”
e5“No severe chloroplast ultrastructure damage was observed under cold stress, but the number of osmiophilic granules in 'Shanyou63' increased rapidly”
Claim · model-written summary
The number of osmiophilic granules increased rapidly in Shanyou63 under cold stress.
- Taxon
- hybrid riceOryza sativae0
- Material
- Shanyou63e5
- Treatment
- cold stresse5
- Outcome
- number of osmiophilic granulese5
- Direction
- increasede5
- Qualifier
- rapidlye5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high-yield hybrid rice (Oryza sativa L.) at the seedling stage to low temperature”
e5“No severe chloroplast ultrastructure damage was observed under cold stress, but the number of osmiophilic granules in 'Shanyou63' increased rapidly”
Claim · model-written summary
Liangyoupeijiu is more chill-resistant than Shanyou63 at the seedling stage.
- Taxon
- hybrid riceOryza sativae0
- Material
- Liangyoupeijiue6
- Organ / stage
- seedling stagee6
- Treatment
- low temperature treatmente7
- Outcome
- chill-resistante6
- Direction
- moree6
- Comparator
- Shanyou63e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high-yield hybrid rice (Oryza sativa L.) at the seedling stage to low temperature”
e6“The results indicate that compared to 'Shanyou63', 'Liangyoupeijiu' is more chill-resistant at the seedling stage”
e7“with 20°C as the control condition and 10°C as the low temperature treatment”
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