Abstract
The synthesis of assimilate such as starch,protein and lipid depends on the photosynthesis. Under stresses,the pigments,primary reaction and electronic transport chain which have relations with photosynthesis are hurt or inhibited. The effect of high temperature caused by Greenhouse Effects becomes more and more frequent. To elucidate the injury mechanism under high temperature in rice plants,the dynamic changes of chlorophyll content,chlorophyll fluorescence parameters and active oxygen resistance activity were measured and the grain quality indices including starch,protein,and chalkiness were also analyzed in rice plants of cultivars Xinongyou 30 and Fuyou 1 during grain-filling period under high temperature treatment in climatic cabinets. The results showed that under high temperature(33℃ ),chlorophyll content of leaves decreased,initial fluorescence(Fo) increased obviously,maximal photochemical efficiency of PS II(Fv/Fm) and the potential photochemical efficiency of PS II(Fv/Fo) decreased,Fv/Fo and Fv/Fm declined faster during the whole grain-filling period,especially in late period. Meanwhile,active oxygen resistance activity(AORA) lowered by 45.16 and 35.99% as compared with the control in the late grain-filling period;under high temperature condition,the total starch and amylose contents of grains were lower than those of control,the protein contents increased to a different degree,and chalkiness and 1000-grain weight changed significantly in two cultivars. The main reason of degeneration of grain quality under high temperature stress is related to the inhibition of primary reaction of photosynthesis,drop of active oxygen resistance activity and contraction of functional period in leaves of rice plants.
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Claims 12
Claim · model-written summary
At 33℃, leaf chlorophyll content decreased.
- Taxon
- Rice Plants
Oryza sativat0 - Treatment
- high temperature(33℃ )e0
- Outcome
- chlorophyll content of leavese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under high temperature(33℃ ),chlorophyll content of leaves decreased”
t0“Effects of High Temperature on Chlorophyll Fluorescence,Active Oxygen Resistance Activity,and Grain Quality in Grain-Filling Periods in Rice Plants”
Claim · model-written summary
At 33℃, initial fluorescence increased.
- Taxon
- Rice PlantsOryza sativat0
- Treatment
- high temperature(33℃ )e0
- Outcome
- initial fluorescence(Fo)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under high temperature(33℃ ),chlorophyll content of leaves decreased,initial fluorescence(Fo) increased obviously”
t0“Effects of High Temperature on Chlorophyll Fluorescence,Active Oxygen Resistance Activity,and Grain Quality in Grain-Filling Periods in Rice Plants”
Claim · model-written summary
At 33℃, maximal PS II photochemical efficiency decreased.
- Taxon
- Rice PlantsOryza sativat0
- Treatment
- High Temperaturet0
- Outcome
- maximal photochemical efficiency of PS II(Fv/Fm)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maximal photochemical efficiency of PS II(Fv/Fm) and the potential photochemical efficiency of PS II(Fv/Fo) decreased”
t0“Effects of High Temperature on Chlorophyll Fluorescence,Active Oxygen Resistance Activity,and Grain Quality in Grain-Filling Periods in Rice Plants”
Claim · model-written summary
At 33℃, potential PS II photochemical efficiency decreased.
- Taxon
- Rice PlantsOryza sativat0
- Treatment
- High Temperaturet0
- Outcome
- potential photochemical efficiency of PS II(Fv/Fo)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maximal photochemical efficiency of PS II(Fv/Fm) and the potential photochemical efficiency of PS II(Fv/Fo) decreased”
t0“Effects of High Temperature on Chlorophyll Fluorescence,Active Oxygen Resistance Activity,and Grain Quality in Grain-Filling Periods in Rice Plants”
Claim · model-written summary
Fv/Fo and Fv/Fm declined faster throughout grain filling, particularly late in the period.
- Taxon
- Rice PlantsOryza sativat0
- Treatment
- High Temperaturet0
- Outcome
- Fv/Fo and Fv/Fme0
- Direction
- declined fastere0
- Qualifier
- especially in late periode0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fv/Fo and Fv/Fm declined faster during the whole grain-filling period,especially in late period”
t0“Effects of High Temperature on Chlorophyll Fluorescence,Active Oxygen Resistance Activity,and Grain Quality in Grain-Filling Periods in Rice Plants”
Claim · model-written summary
High temperature lowered active oxygen resistance activity by 45.16 and 35.99% in late grain filling compared with the control.
- Taxon
- Rice PlantsOryza sativat0
- Treatment
- High Temperaturet0
- Outcome
- active oxygen resistance activity(AORA)e0
- Direction
- lowerede0
- Value
- 45.16 and 35.99%e0
- Qualifier
- late grain-filling periode0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“active oxygen resistance activity(AORA) lowered by 45.16 and 35.99% as compared with the control in the late grain-filling period”
t0“Effects of High Temperature on Chlorophyll Fluorescence,Active Oxygen Resistance Activity,and Grain Quality in Grain-Filling Periods in Rice Plants”
Claim · model-written summary
High temperature lowered total starch content in rice grains compared with control.
- Taxon
- Rice PlantsOryza sativat0
- Treatment
- high temperature conditione0
- Outcome
- total starche0
- Direction
- lowere0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under high temperature condition,the total starch and amylose contents of grains were lower than those of control”
t0“Effects of High Temperature on Chlorophyll Fluorescence,Active Oxygen Resistance Activity,and Grain Quality in Grain-Filling Periods in Rice Plants”
Claim · model-written summary
High temperature lowered amylose content in rice grains compared with control.
- Taxon
- Rice PlantsOryza sativat0
- Treatment
- high temperature conditione0
- Outcome
- amylose contents of grainse0
- Direction
- lowere0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under high temperature condition,the total starch and amylose contents of grains were lower than those of control”
t0“Effects of High Temperature on Chlorophyll Fluorescence,Active Oxygen Resistance Activity,and Grain Quality in Grain-Filling Periods in Rice Plants”
Claim · model-written summary
High temperature increased protein content to different degrees.
- Taxon
- Rice PlantsOryza sativat0
- Treatment
- High Temperaturet0
- Outcome
- protein contentse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the protein contents increased to a different degree”
t0“Effects of High Temperature on Chlorophyll Fluorescence,Active Oxygen Resistance Activity,and Grain Quality in Grain-Filling Periods in Rice Plants”
Claim · model-written summary
Chalkiness changed significantly in the two cultivars under high temperature.
- Taxon
- Rice PlantsOryza sativat0
- Treatment
- High Temperaturet0
- Outcome
- chalkinesse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chalkiness and 1000-grain weight changed significantly in two cultivars”
t0“Effects of High Temperature on Chlorophyll Fluorescence,Active Oxygen Resistance Activity,and Grain Quality in Grain-Filling Periods in Rice Plants”
Claim · model-written summary
Thousand-grain weight changed significantly in the two cultivars under high temperature.
- Taxon
- Rice PlantsOryza sativat0
- Treatment
- High Temperaturet0
- Outcome
- 1000-grain weighte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chalkiness and 1000-grain weight changed significantly in two cultivars”
t0“Effects of High Temperature on Chlorophyll Fluorescence,Active Oxygen Resistance Activity,and Grain Quality in Grain-Filling Periods in Rice Plants”
Claim · model-written summary
The authors attributed grain quality degeneration under high temperature to inhibition of photosynthetic primary reactions, lower oxygen resistance activity and a shorter leaf functional period.
- Taxon
- rice plantsOryza sativae0
- Outcome
- degeneration of grain qualitye0
- Qualifier
- inhibition of primary reaction of photosynthesis,drop of active oxygen resistance activity and contraction of functional period in leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The main reason of degeneration of grain quality under high temperature stress is related to the inhibition of primary reaction of photosynthesis,drop of active oxygen resistance activity and contraction of functional period in leaves of rice plants”
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