Abstract
The experiments were conducted to identify thermo-tolerant rice genotypes and characterize physiological traits relevant to heat stress tolerance. Seventy-two rice genotypes were exposed to high temperature (40℃ /35 ℃, 14 h/10 h) for 12 d at heading stage, and floret fertility was examined. The similar results were obtained in the two years experiments that there was a distinctly genotypic difference in floret fertility as affected by heat stress. When rice seedlings were exposed to heat stress, chlorophyll content (SPAD value), plant height, root length, shoot and root biomass were dramatically reduced, with thermo-tolerant genotypes being relatively less affected than sensitive ones. Meanwhile, high temperature enhanced membrane lipid peroxidation, as expressed by malondialdehyde content and increased superoxide dismutase (SOD) activity. Thermo-tolerant genotypes had less and more increase in MDA content and SOD activity than sensitive ones under heat stress relative to the control, respectively. Accordingly the thermo-tolerant genotypes were identified, with genotypes CJ6, MY46 and JX17 being highly thermo-tolerant, MH63, Kasalath and IRAT4217 being very sensitive.
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Claims 11
Claim · model-written summary
Floret fertility differed distinctly among genotypes under heat stress across two years.
- Taxon
- rice
Oryza sativae1 - Treatment
- heat stresse0
- Outcome
- floret fertilitye0
- Direction
- differencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was a distinctly genotypic difference in floret fertility as affected by heat stress”
e1“thermo-tolerant rice genotypes”
Claim · model-written summary
Heat stress dramatically reduced seedling chlorophyll content.
- Taxon
- riceOryza sativae0
- Treatment
- heat stresse0
- Outcome
- chlorophyll content (SPAD value)e0
- Direction
- dramatically reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When rice seedlings were exposed to heat stress, chlorophyll content (SPAD value), plant height, root length, shoot and root biomass were dramatically reduced”
Claim · model-written summary
Heat stress dramatically reduced seedling height and root length.
- Taxon
- riceOryza sativae0
- Treatment
- heat stresse0
- Outcome
- plant height, root lengthe0
- Direction
- dramatically reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When rice seedlings were exposed to heat stress, chlorophyll content (SPAD value), plant height, root length, shoot and root biomass were dramatically reduced”
Claim · model-written summary
Heat stress dramatically reduced shoot and root biomass.
- Taxon
- riceOryza sativae0
- Treatment
- heat stresse0
- Outcome
- shoot and root biomasse0
- Direction
- dramatically reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When rice seedlings were exposed to heat stress, chlorophyll content (SPAD value), plant height, root length, shoot and root biomass were dramatically reduced”
Claim · model-written summary
Tolerant genotypes were less affected in these seedling traits than sensitive genotypes.
- Taxon
- riceOryza sativae1
- Material
- thermo-tolerant genotypese0
- Outcome
- relatively less affectede0
- Direction
- less affectede0
- Comparator
- sensitive onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with thermo-tolerant genotypes being relatively less affected than sensitive ones”
e1“rice seedlings”
Claim · model-written summary
High temperature enhanced membrane lipid peroxidation measured by MDA content.
- Taxon
- riceOryza sativae1
- Treatment
- high temperaturee0
- Outcome
- membrane lipid peroxidation, as expressed by malondialdehyde contente0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high temperature enhanced membrane lipid peroxidation, as expressed by malondialdehyde content”
e1“rice seedlings”
Claim · model-written summary
High temperature increased SOD activity.
- Taxon
- riceOryza sativae1
- Treatment
- high temperaturee0
- Outcome
- superoxide dismutase (SOD) activitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high temperature enhanced membrane lipid peroxidation, as expressed by malondialdehyde content and increased superoxide dismutase (SOD) activity”
e1“rice seedlings”
Claim · model-written summary
Heat-induced MDA increase was smaller in tolerant than sensitive genotypes.
- Taxon
- riceOryza sativae1
- Material
- Thermo-tolerant genotypese0
- Treatment
- heat stresse0
- Outcome
- MDA contente0
- Direction
- lesse0
- Comparator
- sensitive onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thermo-tolerant genotypes had less and more increase in MDA content and SOD activity than sensitive ones under heat stress relative to the control”
e1“rice seedlings”
Claim · model-written summary
Heat-induced SOD activity increase was greater in tolerant than sensitive genotypes.
- Taxon
- riceOryza sativae1
- Material
- Thermo-tolerant genotypese0
- Treatment
- heat stresse0
- Outcome
- SOD activitye0
- Direction
- more increasee0
- Comparator
- sensitive onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thermo-tolerant genotypes had less and more increase in MDA content and SOD activity than sensitive ones under heat stress relative to the control”
e1“rice seedlings”
Claim · model-written summary
CJ6, MY46, and JX17 were highly heat tolerant.
- Taxon
- riceOryza sativae1
- Material
- CJ6, MY46 and JX17e0
- Outcome
- highly thermo-tolerante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“genotypes CJ6, MY46 and JX17 being highly thermo-tolerant”
e1“rice seedlings”
Claim · model-written summary
MH63, Kasalath, and IRAT4217 were very heat sensitive.
- Taxon
- riceOryza sativae1
- Material
- MH63, Kasalath and IRAT4217e0
- Outcome
- very sensitivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MH63, Kasalath and IRAT4217 being very sensitive”
e1“rice seedlings”
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