Abstract
Chlorophyll a fluorescence kinetics and photosynthesis rate of overwintering Euonmymus japonicus in Beijing public gardens were investigated with PAM2100 and OXYLAB.The acclimation mechanism of Photosystem Ⅱ(PSⅡ) was discussed.With the onset of winter,both photochemichal rate of PSⅡ and photosynthetic rate decreased gradually,and the decrease of sun leaves were greater than that of shade leaves.In winter,kinetics of chlorophyll a fluorescence induction curves of sun leaves disappeared,while that of shade leaves still exists.On the other hand,several mechanisms combined to effectively protect the photosynthetic apparatus from photodamage in winter.Firstly,the fact that both minimal fluorescence(Fo) and max photochemical rate of PSⅡ(FV/Fm) decreased indicated that the plant reduced excitons of PSⅡ through cutting the size of light-harvesting antenna.Secondly,results of photochemical quench(qP) suggested that excitons of PSⅡ donor side could be absorbed by keeping open of PSⅡ.Furthermore,both nonlinear electron transport rate and energy dissipation other than antenna were important photoprotective ways for overwintering Euonmymus japonicus.
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Claims 7
Claim · model-written summary
PSII photochemical rate and photosynthetic rate declined with winter onset.
- Taxon
- Euonymus japonicus
Euonymus japonicust0 - Outcome
- photochemichal rate of PSⅡ and photosynthetic ratee0
- Direction
- decreasede0
- Qualifier
- onset of wintere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With the onset of winter,both photochemichal rate of PSⅡ and photosynthetic rate decreased gradually”
t0“Euonymus japonicus”
Claim · model-written summary
The winter decline was greater in sun leaves than shade leaves.
- Taxon
- Euonymus japonicusEuonymus japonicust0
- Organ / stage
- sun leavese0
- Outcome
- decreasee0
- Direction
- greatere0
- Comparator
- shade leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the decrease of sun leaves were greater than that of shade leaves”
t0“Euonymus japonicus”
Claim · model-written summary
Winter chlorophyll fluorescence induction curves disappeared in sun leaves but persisted in shade leaves.
- Taxon
- Euonymus japonicusEuonymus japonicust0
- Organ / stage
- sun leavese0
- Outcome
- chlorophyll a fluorescence induction curvese0
- Qualifier
- disappearede0
- Comparator
- shade leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In winter,kinetics of chlorophyll a fluorescence induction curves of sun leaves disappeared,while that of shade leaves still exists.”
t0“Euonymus japonicus”
Claim · model-written summary
Minimal fluorescence and maximum PSII photochemical rate decreased in winter.
- Taxon
- Euonymus japonicusEuonymus japonicust0
- Outcome
- minimal fluorescence(Fo) and max photochemical rate of PSⅡ(FV/Fm)e0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both minimal fluorescence(Fo) and max photochemical rate of PSⅡ(FV/Fm) decreased”
t0“Euonymus japonicus”
Claim · model-written summary
The authors interpret the fluorescence declines as reduced PSII excitons through a smaller light-harvesting antenna.
- Taxon
- Euonymus japonicusEuonymus japonicust0
- Outcome
- excitons of PSⅡe0
- Direction
- reducede0
- Qualifier
- cutting the size of light-harvesting antennae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the plant reduced excitons of PSⅡ through cutting the size of light-harvesting antenna”
t0“Euonymus japonicus”
Claim · model-written summary
Photochemical quenching results suggested PSII donor-side excitons could be absorbed by keeping PSII open.
- Taxon
- Euonymus japonicusEuonymus japonicust0
- Outcome
- excitons of PSⅡ donor sidee0
- Qualifier
- keeping open of PSⅡe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“results of photochemical quench(qP) suggested that excitons of PSⅡ donor side could be absorbed by keeping open of PSⅡ”
t0“Euonymus japonicus”
Claim · model-written summary
Nonlinear electron transport and energy dissipation outside the antenna were identified as winter photoprotection routes.
Verbatim
e0“both nonlinear electron transport rate and energy dissipation other than antenna were important photoprotective ways for overwintering Euonmymus japonicus.”