Abstract
Taking the polyphasic rise of the chlorophyll a fluorescence transients(OJIP)as probe,this study was conducted to determine the effects of different nitrogen rate(0,0.36,0.72 g·kg-1)on photosystemⅡ(PSⅡ)functions in leaves of flue-cured tobacco seedlings during the transplantation stage under drought stress.A flue-cured tobacco variety'Longjiang 911'was used as experimental material.The results showed that the maximum photochemical efficiency(Fv/Fm),potential activities of PSⅡ(Fv/F0)and the apparent electron transport rate(ETR)in leaves of flue-cured tobacco seedlings decreased under drought stress,the proportion of energy which was used for photochemical reaction also reduced,and the photoinhibition of photosynthesis occurred evidently under drought conditions,and the PSⅡ reaction centre was hurt.The appropriate amount of nitrogen fertilizer application(0.36 g·kg-1,pure nitrogen in soil)could increase the opening degree in surplus activity center and maintain the stability of electron-transport chain,and it also could improve the amount of light energy by capturing(φPo),the quantum yield for electron transport(φEo)and the electron transport efficiency of per reaction center(ETo/RC)by reducing the degradation of protein that was related to light energy capturing and electron transport in leaves of flue-cured tobacco seedlings.At the same time,the appropriate amount of nitrogen fertilizer application protected the flue-cured tobacco from injury during drought stress by increasing the heat dissipation,and observably improved the drought resistance of flue-cured tobacco seedlings.But the over-fertilization of nitrogen always caused the reduction of the drought resistance of flue-cured tobacco seedlings.
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Claims 8
Claim · model-written summary
Drought reduced Fv/Fm, Fv/F0 and ETR in tobacco seedling leaves.
- Taxon
- flue-cured tobacco seedlingst0
- Treatment
- drought stresse1
- Outcome
- maximum photochemical efficiency(Fv/Fm),potential activities of PSⅡ(Fv/F0)and the apparent electron transport rate(ETR)e1
- Direction
- decreasede1
Not reportedComparator
Verbatim
t0“flue-cured tobacco seedlings”
e1“the maximum photochemical efficiency(Fv/Fm),potential activities of PSⅡ(Fv/F0)and the apparent electron transport rate(ETR)in leaves of flue-cured tobacco seedlings decreased under drought stress”
Claim · model-written summary
Drought reduced the energy proportion used in photochemistry.
- Taxon
- flue-cured tobacco seedlingst0
- Outcome
- proportion of energy which was used for photochemical reactione1
- Direction
- reducede1
Not reportedTreatmentComparator
Verbatim
t0“flue-cured tobacco seedlings”
e1“the proportion of energy which was used for photochemical reaction also reduced”
Claim · model-written summary
Drought produced photoinhibition and PSII reaction-centre injury.
Verbatim
t0“flue-cured tobacco seedlings”
e1“the photoinhibition of photosynthesis occurred evidently under drought conditions,and the PSⅡ reaction centre was hurt”
Claim · model-written summary
Nitrogen at 0.36 g·kg-1 increased opening of surplus active centres and stabilized electron transport.
- Taxon
- flue-cured tobacco seedlingst0
- Treatment
- nitrogen fertilizer application(0.36 g·kg-1,pure nitrogen in soil)e1
- Outcome
- opening degree in surplus activity centere1
- Direction
- increasee1
Not reportedComparator
Verbatim
t0“flue-cured tobacco seedlings”
e1“The appropriate amount of nitrogen fertilizer application(0.36 g·kg-1,pure nitrogen in soil)could increase the opening degree in surplus activity center and maintain the stability of electron-transport chain”
Claim · model-written summary
Nitrogen at 0.36 g·kg-1 improved φPo, φEo and ETo/RC.
- Taxon
- flue-cured tobacco seedlingst0
- Treatment
- nitrogen fertilizer application(0.36 g·kg-1,pure nitrogen in soil)e1
- Outcome
- amount of light energy by capturing(φPo),the quantum yield for electron transport(φEo)and the electron transport efficiency of per reaction center(ETo/RC)e1
- Direction
- improvee1
Not reportedComparator
Verbatim
t0“flue-cured tobacco seedlings”
e1“nitrogen fertilizer application(0.36 g·kg-1,pure nitrogen in soil)could increase the opening degree in surplus activity center and maintain the stability of electron-transport chain,and it also could improve the amount of light energy by capturing(φPo),the quantum yield for electron transport(φEo)and the electron transport efficiency of per reaction center(ETo/RC)”
Claim · model-written summary
Appropriate nitrogen increased heat dissipation during drought.
- Taxon
- flue-cured tobacco seedlingst0
- Treatment
- appropriate amount of nitrogen fertilizer applicatione1
- Outcome
- heat dissipatione1
- Direction
- increasinge1
Not reportedComparator
Verbatim
t0“flue-cured tobacco seedlings”
e1“appropriate amount of nitrogen fertilizer application protected the flue-cured tobacco from injury during drought stress by increasing the heat dissipation”
Claim · model-written summary
Appropriate nitrogen improved drought resistance of tobacco seedlings.
- Taxon
- flue-cured tobacco seedlingst0
- Treatment
- appropriate amount of nitrogen fertilizer applicatione1
- Outcome
- drought resistancee1
- Direction
- improvede1
Not reportedComparator
Verbatim
t0“flue-cured tobacco seedlings”
e1“At the same time,the appropriate amount of nitrogen fertilizer application protected the flue-cured tobacco from injury during drought stress by increasing the heat dissipation,and observably improved the drought resistance of flue-cured tobacco seedlings”
Claim · model-written summary
Excess nitrogen reduced tobacco seedling drought resistance.
- Taxon
- flue-cured tobacco seedlingst0
- Treatment
- over-fertilization of nitrogene1
- Outcome
- drought resistancee1
- Direction
- reductione1
Not reportedComparator
Verbatim
t0“flue-cured tobacco seedlings”
e1“the over-fertilization of nitrogen always caused the reduction of the drought resistance of flue-cured tobacco seedlings”
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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.