Abstract
【Objective】The combined effects of different temperature and light treatments on the operation of photosynthetic apparatus were investigated to reveal the mechanism of inhibition of photosynthesis.【Method】One-year-old Cabernet Sauvignon grapevines were treated with different temperatures(28,34,37 and 40℃)combined with two kinds of light intensities(800,1600 μmol?m-2?s-1).Gas exchange and chlorophyll a fluorescence parameters were simultaneously analyzed to investigate the effects of different treatments on the PSII function【Result】Despite the treated light intensities,as temperature increased,net photosynthetic rate(Pn),stomatal conductance(Gs),actual PSⅡ efficiency(ΦPSII),electron transport rate(ETR),performance index(PIABS),density of RCs(RC/CS) and the probability that a trapped exciton moves an electron into the electron transport chain beyond QA(ΨEo) decreased;PSⅡ excitation pressure(1-qP),non-photochemical quenching(NPQ) and approximated initial slope of the fluorescence transient(Mo) increased.Under the moderate light intensities,the decrease of Pn was due mainly to stomatal limitation during the temperature from 28℃ to 37℃,and the xanthophyll cycle played an increased role to protect photosystem II.Under strong light stress,28℃ treatment decreased Pn to the level of the 40℃ treatment of moderate light intensities,meanwhile PIABS reached a lower level.【Conclusion】Under moderate light intensities,the PSⅡacceptor sides were not injured until the temperature reached 37℃;strong light stress,however,began to injure the PSⅡ acceptor sides from 28℃,when the temperature reached or exceeded 37℃,the density of RCs and the acceptor sides were damaged severely which showed PSⅡcould be more susceptible to strong light than moderate heat temperature.
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Claims 12
Claim · model-written summary
Increasing temperature decreased Pn, Gs and PSII efficiency.
- Taxon
- Vitis vinifera
Vitis viniferat0 - Treatment
- temperature increasede0
- Outcome
- net photosynthetic rate(Pn),stomatal conductance(Gs),actual PSⅡ efficiency(ΦPSII)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“as temperature increased,net photosynthetic rate(Pn),stomatal conductance(Gs),actual PSⅡ efficiency(ΦPSII),electron transport rate(ETR),performance index(PIABS),density of RCs(RC/CS) and the probability that a trapped exciton moves an electron into the electron transport chain beyond QA(ΨEo) decreased”
t0“Vitis vinifera”
Claim · model-written summary
Increasing temperature decreased ETR, PIABS and RC density.
- Taxon
- Vitis viniferaVitis viniferat0
- Treatment
- temperature increasede0
- Outcome
- electron transport rate(ETR),performance index(PIABS),density of RCs(RC/CS)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“as temperature increased,net photosynthetic rate(Pn),stomatal conductance(Gs),actual PSⅡ efficiency(ΦPSII),electron transport rate(ETR),performance index(PIABS),density of RCs(RC/CS) and the probability that a trapped exciton moves an electron into the electron transport chain beyond QA(ΨEo) decreased”
t0“Vitis vinifera”
Claim · model-written summary
Increasing temperature decreased ΨEo.
- Taxon
- Vitis viniferaVitis viniferat0
- Treatment
- temperature increasede0
- Outcome
- probability that a trapped exciton moves an electron into the electron transport chain beyond QA(ΨEo)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“as temperature increased,net photosynthetic rate(Pn),stomatal conductance(Gs),actual PSⅡ efficiency(ΦPSII),electron transport rate(ETR),performance index(PIABS),density of RCs(RC/CS) and the probability that a trapped exciton moves an electron into the electron transport chain beyond QA(ΨEo) decreased”
t0“Vitis vinifera”
Claim · model-written summary
Increasing temperature increased excitation pressure, NPQ and Mo.
- Taxon
- Vitis viniferaVitis viniferat0
- Treatment
- temperaturet0
- Outcome
- PSⅡ excitation pressure(1-qP),non-photochemical quenching(NPQ) and approximated initial slope of the fluorescence transient(Mo)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PSⅡ excitation pressure(1-qP),non-photochemical quenching(NPQ) and approximated initial slope of the fluorescence transient(Mo) increased”
t0“Temperature and Light Treatments on Photosynthetic System II in Vitis vinifera”
Claim · model-written summary
At moderate light, stomatal limitation chiefly explained Pn decline from 28 to 37 degrees C.
- Taxon
- Vitis viniferaVitis viniferat0
- Treatment
- moderate light intensitiese0
- Outcome
- decrease of Pne0
- Qualifier
- stomatal limitatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under the moderate light intensities,the decrease of Pn was due mainly to stomatal limitation during the temperature from 28℃ to 37℃”
t0“Vitis vinifera”
Claim · model-written summary
Xanthophyll cycle protection of PSII increased under moderate light.
- Taxon
- Vitis viniferaVitis viniferat0
- Outcome
- protect photosystem IIe0
- Qualifier
- xanthophyll cyclee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the xanthophyll cycle played an increased role to protect photosystem II”
t0“Vitis vinifera”
Claim · model-written summary
Under strong light at 28 degrees C, Pn declined to its level under moderate light at 40 degrees C.
- Taxon
- Vitis viniferaVitis viniferat0
- Treatment
- strong light stress,28℃ treatmente0
- Outcome
- Pne0
- Direction
- decreasede0
- Comparator
- 40℃ treatment of moderate light intensitiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under strong light stress,28℃ treatment decreased Pn to the level of the 40℃ treatment of moderate light intensities”
t0“Vitis vinifera”
Claim · model-written summary
Under strong light, PIABS reached a lower level.
- Taxon
- Vitis viniferaVitis viniferat0
- Treatment
- strong light stresse0
- Outcome
- PIABSe0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under strong light stress,28℃ treatment decreased Pn to the level of the 40℃ treatment of moderate light intensities,meanwhile PIABS reached a lower level”
t0“Vitis vinifera”
Claim · model-written summary
Under moderate light, PSII acceptor sides were uninjured until 37 degrees C.
- Taxon
- Vitis viniferaVitis viniferat0
- Treatment
- moderate light intensitiese0
- Outcome
- PSⅡacceptor sides were not injurede0
- Qualifier
- 37℃e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under moderate light intensities,the PSⅡacceptor sides were not injured until the temperature reached 37℃”
t0“Vitis vinifera”
Claim · model-written summary
Strong light injured PSII acceptor sides beginning at 28 degrees C.
- Taxon
- Vitis viniferaVitis viniferat0
- Treatment
- strong light stresse0
- Outcome
- PSⅡ acceptor sidese0
- Direction
- injuree0
- Qualifier
- 28℃e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“strong light stress,however,began to injure the PSⅡ acceptor sides from 28℃”
t0“Vitis vinifera”
Claim · model-written summary
At 37 degrees C or above, RC density and acceptor sides were severely damaged.
- Taxon
- Vitis viniferaVitis viniferat0
- Treatment
- temperature reached or exceeded 37℃e0
- Outcome
- density of RCs and the acceptor sidese0
- Direction
- damaged severelye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when the temperature reached or exceeded 37℃,the density of RCs and the acceptor sides were damaged severely”
t0“Vitis vinifera”
Claim · model-written summary
The authors conclude PSII is more susceptible to strong light than moderate heat.
- Taxon
- Vitis viniferaVitis viniferat0
- Outcome
- PSⅡcould be more susceptiblee0
- Direction
- more susceptiblee0
- Comparator
- moderate heat temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PSⅡcould be more susceptible to strong light than moderate heat temperature”
t0“Vitis vinifera”
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