Abstract
[Objective] The research aimed to study the effects of high temperature stress and recovery on PSⅡ dynamic characteristics and protective enzyme activities of rice during jointing stage.[Method] The rice varieties was No.6 of Zhenjiang.The high temperature stress 1,3,5 d treatments,the recovery 2 d after high temperature stress 5 d treatment and the normal temperature control were designed.The stress temperature in one day was designed as follows: 36 ℃ at 10:00,38 ℃ at 11:00,39 ℃ at 12:00,40 ℃ at 13:00,38 ℃ at 14:00,35 ℃ at 15:00.[Result] The results showed that the main PSⅡ parameters F0 of rice varied little under different high temperature stress compared with the control group.Fv/Fm of rice was significantly decreasing under high temperature stress 1,3,5 d treatments compared with the control group,but that of high temperature stress 3,5 d treatments increased compared with high temperature stress 1 d,and that of the recovery 2 d after high temperature stress 5 d treatment had no significant difference with the control group.The activities of protective enzymes such as POD and CAT were significantly enhanced and the MDA content was increased under high temperature stress 1 d treatment compared with the control group,but this trend was decreased gradually with extension of stress time,closed to the control finally.[Conclusion] High temperature in summer causes irreversible damage on PSⅡ reaction center of rice,then recoveries gradually under the function of protective enzymes,and the adaptability of rice increases by degrees,is close to normal level after recovery 2 d under room temperature.
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Claims 9
Claim · model-written summary
Rice F0 changed little under high temperature stress compared with the control.
- Taxon
- rice
Oryza sativae0 - Treatment
- different high temperature stresse0
- Outcome
- F0e0
- Direction
- varied littlee0
- Comparator
- control groupe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“F0 of rice varied little under different high temperature stress compared with the control group”
Claim · model-written summary
Rice Fv/Fm decreased significantly after 1, 3 and 5 days of heat stress compared with control.
- Taxon
- riceOryza sativae0
- Treatment
- high temperature stress 1,3,5 d treatmentse0
- Outcome
- Fv/Fme0
- Direction
- decreasinge0
- Comparator
- control groupe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fv/Fm of rice was significantly decreasing under high temperature stress 1,3,5 d treatments compared with the control group”
Claim · model-written summary
Fv/Fm after 3 and 5 days of heat stress exceeded that after 1 day.
- Taxon
- riceOryza sativat0
- Treatment
- high temperature stress 3,5 d treatmentse0
- Outcome
- Fv/Fme1
- Direction
- increasede0
- Comparator
- high temperature stress 1 de0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high temperature stress 3,5 d treatments increased compared with high temperature stress 1 d”
e1“Fv/Fm of rice was significantly decreasing under high temperature stress 1,3,5 d treatments compared with the control group”
t0“rice”
Claim · model-written summary
Fv/Fm after two days of recovery from five days of heat stress did not differ significantly from control.
- Taxon
- riceOryza sativat0
- Treatment
- recovery 2 d after high temperature stress 5 d treatmente0
- Outcome
- Fv/Fme1
- Direction
- no significant differencee0
- Comparator
- control groupe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“recovery 2 d after high temperature stress 5 d treatment had no significant difference with the control group”
e1“Fv/Fm of rice was significantly decreasing under high temperature stress 1,3,5 d treatments compared with the control group”
t0“rice”
Claim · model-written summary
POD and CAT activity increased significantly after one day of heat stress compared with control.
- Taxon
- riceOryza sativat0
- Treatment
- high temperature stress 1 d treatmente0
- Outcome
- activities of protective enzymes such as POD and CATe0
- Direction
- enhancede0
- Comparator
- control groupe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“activities of protective enzymes such as POD and CAT were significantly enhanced and the MDA content was increased under high temperature stress 1 d treatment compared with the control group”
t0“rice”
Claim · model-written summary
MDA content increased after one day of heat stress compared with control.
- Taxon
- riceOryza sativat0
- Treatment
- high temperature stress 1 d treatmente0
- Outcome
- MDA contente0
- Direction
- increasede0
- Comparator
- control groupe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MDA content was increased under high temperature stress 1 d treatment compared with the control group”
t0“rice”
Claim · model-written summary
The initial enzyme and MDA response declined with longer stress and approached control.
- Taxon
- riceOryza sativat0
- Outcome
- this trende0
- Direction
- decreased graduallye0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this trend was decreased gradually with extension of stress time,closed to the control finally”
t0“rice”
Claim · model-written summary
The authors conclude that heat damages the rice PSII reaction center and recovery occurs with protective enzyme function.
- Taxon
- riceOryza sativae0
- Treatment
- High temperature in summere0
- Outcome
- PSⅡ reaction centere0
- Qualifier
- under the function of protective enzymese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High temperature in summer causes irreversible damage on PSⅡ reaction center of rice,then recoveries gradually under the function of protective enzymes”
Claim · model-written summary
The authors conclude that rice adaptability increases and approaches normal after two days of room temperature recovery.
- Taxon
- riceOryza sativae0
- Outcome
- adaptabilitye0
- Direction
- increasese0
- Qualifier
- after recovery 2 d under room temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“adaptability of rice increases by degrees,is close to normal level after recovery 2 d under room temperature”
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