Abstract
Abstract Ultraviolet-B radiation (UV-B) is generally considered to negatively impact the photosynthetic apparatus and plant growth. UV-B damages PSII but does not directly influence PSI. However, PSI and PSII successively drive photosynthetic electron transfer, therefore, the interaction between these systems is unavoidable. So we speculated that UV-B could indirectly affect PSI under chilling-light conditions. To test this hypothesis, the cucumber leaves were illuminated by UV-B prior or during the chilling-light treatment and the leaves were then transferred to 25 °C and low-light conditions for recovery. The results showed that UV-B decreased the electron transfer to PSI by inactivating the oxygen-evolving complex (OEC), thereby protecting PSI from chilling-light-induced photoinhibition. This effect advantages the recoveries of PSI and CO 2 assimilation after chilling-light stress, therefore should minimize the yield loss caused by chilling-light stress. Because sunlight consists of both UV-B and visible light, we suggest that UV-B-induced OEC inactivation is critical for chilling-light-induced PSI photoinhibition in field. Moreover, additional UV-B irradiation is an effective strategy to relieve PSI photoinhibition and yield loss in protected cultivation during winter. This study also demonstrates that minimizing the photoinhibition of PSI rather than that of PSII is essential for the chilling-light tolerance of the plant photosynthetic apparatus.
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Claims 7
Claim · model-written summary
UV-B reduced electron transfer to PSI in cucumber leaves by inactivating OEC.
- Taxon
- Cucumber
Cucumis sativust0 - Treatment
- UV-Be0
- Outcome
- electron transfer to PSIe0
- Direction
- decreasede0
- Qualifier
- inactivating the oxygen-evolving complex (OEC)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber (Cucumis sativus L.) Leaves”
e0“UV-B decreased the electron transfer to PSI by inactivating the oxygen-evolving complex (OEC)”
Claim · model-written summary
UV-B protected cucumber PSI against chilling-light photoinhibition.
- Taxon
- CucumberCucumis sativust0
- Treatment
- UV-Be1
- Outcome
- PSI from chilling-light-induced photoinhibitione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber (Cucumis sativus L.) Leaves”
e0“thereby protecting PSI from chilling-light-induced photoinhibition”
e1“UV-B decreased the electron transfer to PSI”
Claim · model-written summary
UV-B benefited PSI recovery after chilling-light stress.
- Taxon
- CucumberCucumis sativust0
- Treatment
- UV-Be1
- Outcome
- recoveries of PSIe0
- Direction
- advantagese0
- Qualifier
- after chilling-light stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber (Cucumis sativus L.) Leaves”
e0“This effect advantages the recoveries of PSI and CO 2 assimilation after chilling-light stress”
e1“UV-B decreased the electron transfer to PSI”
Claim · model-written summary
UV-B benefited CO2 assimilation recovery after chilling-light stress.
- Taxon
- CucumberCucumis sativust0
- Treatment
- UV-Be1
- Outcome
- CO 2 assimilatione0
- Direction
- advantagese0
- Qualifier
- after chilling-light stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber (Cucumis sativus L.) Leaves”
e0“This effect advantages the recoveries of PSI and CO 2 assimilation after chilling-light stress”
e1“UV-B decreased the electron transfer to PSI”
Claim · model-written summary
Authors suggest UV-B-induced OEC inactivation is critical for PSI photoinhibition under field chilling light.
- Taxon
- CucumberCucumis sativust0
- Outcome
- chilling-light-induced PSI photoinhibitione0
- Qualifier
- UV-B-induced OEC inactivatione0
- Setting
- fielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber (Cucumis sativus L.) Leaves”
e0“we suggest that UV-B-induced OEC inactivation is critical for chilling-light-induced PSI photoinhibition in field”
Claim · model-written summary
Authors recommend extra UV-B to relieve PSI photoinhibition and yield loss in winter protected cultivation.
- Taxon
- CucumberCucumis sativust0
- Treatment
- additional UV-B irradiatione0
- Outcome
- relieve PSI photoinhibition and yield losse0
- Qualifier
- during wintere0
- Setting
- protected cultivatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber (Cucumis sativus L.) Leaves”
e0“additional UV-B irradiation is an effective strategy to relieve PSI photoinhibition and yield loss in protected cultivation during winter”
Claim · model-written summary
Authors conclude minimizing PSI photoinhibition is essential to chilling-light tolerance of photosynthesis.
- Taxon
- CucumberCucumis sativust0
- Outcome
- chilling-light tolerance of the plant photosynthetic apparatuse0
- Qualifier
- minimizing the photoinhibition of PSI rather than that of PSIIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Cucumber (Cucumis sativus L.) Leaves”
e0“minimizing the photoinhibition of PSI rather than that of PSII is essential for the chilling-light tolerance of the plant photosynthetic apparatus”
The same questions in other papers
uv · physiology: photosynthesis · Cucumis sativus (cucumber)Results differ
3 papers in the same direction as this paper · 9 in the opposite direction
- no effect
- no effect
- negative
9 papers more in this group
See all 13 papers →radiation · physiology: photosynthesis · Cucumis sativus (cucumber)Positive and negative results
6 in the opposite direction
- negative
- negative
- negative
3 papers more in this group
See all 7 papers →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.