Abstract
The aim of this study was to assess the impact of the mitochondrial alternative oxidase (AOX) pathway on energy metabolism in chloroplast, and evaluate the importance of the AOX pathway in alleviating photoinhibition in cucumber (Cucumis sativus L.) leaves during chilling and the subsequent recovery period. Chilling (12°C) induced up-regultaion of the AOX pathway, which is important for chilled leaves to avoid overreduction of PSII and maintain photosynthetic electron transport. High light (200–300 µmol m−2 s−1) induced the decreases of maximal quantum yield of PSII photochemistry (Fv/Fm) and nonphotochemical quenching (NPQ), which was aggravated by 1 mM salicylhydroxamic acid (SHAM; AOX inhibitor), in cucumber leaves during chilling. However, Fv/Fm did not change and NPQ increased significantly in SHAM-treated leaves by chilling under low light. During recovery periods after chilling under low light, Fv/Fm, qP, ΦPSII, NPQ, and Fv’/Fm’ could return to normal degree in chilled leaves with or without SHAM. In contrast, high light induced more decrease of chlorophyll fluorescence parameters in chilled leaves during the recovery period, and SHAM treatment further aggravated the decrease. These results implied that up-regulation of AOX pathway in chilled leaves plays a critical role in protection against photoinhibition in leaves under excess light energy condition during chilling and the subsequent recovery period. However, thermal energy dissipation was more important to prevent photoinhibition in leaves exposed to chilling under low light.
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Claims 12
Claim · model-written summary
Chilling at 12°C up-regulated the AOX pathway in cucumber leaves.
- Taxon
- cucumber
Cucumis sativust0 - Treatment
- Chilling (12°C)e0
- Outcome
- AOX pathwaye0
- Direction
- up-regultaione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chilling (12°C) induced up-regultaion of the AOX pathway”
t0“cucumber leaves”
Claim · model-written summary
The up-regulated AOX pathway is asserted to be important for chilled cucumber leaves to avoid overreduction of PSII and maintain photosynthetic electron transport.
- Taxon
- cucumberCucumis sativust0
- Outcome
- overreduction of PSIIe0
- Qualifier
- important for chilled leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which is important for chilled leaves to avoid overreduction of PSII and maintain photosynthetic electron transport”
t0“cucumber leaves”
Claim · model-written summary
High light decreased maximal quantum yield of PSII photochemistry (Fv/Fm) and nonphotochemical quenching (NPQ) in chilled cucumber leaves.
- Taxon
- cucumberCucumis sativust0
- Treatment
- High light (200–300 µmol m−2 s−1)e0
- Outcome
- maximal quantum yield of PSII photochemistry (Fv/Fm) and nonphotochemical quenching (NPQ)e0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High light (200–300 µmol m−2 s−1) induced the decreases of maximal quantum yield of PSII photochemistry (Fv/Fm) and nonphotochemical quenching (NPQ)”
t0“cucumber leaves”
Claim · model-written summary
The high-light-induced decreases of Fv/Fm and NPQ in chilled cucumber leaves were aggravated by 1 mM SHAM, an AOX inhibitor.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- 1 mM salicylhydroxamic acid (SHAM; AOX inhibitor)e0
- Outcome
- decreases of maximal quantum yield of PSII photochemistry (Fv/Fm) and nonphotochemical quenching (NPQ)e0
- Direction
- aggravatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High light (200–300 µmol m−2 s−1) induced the decreases of maximal quantum yield of PSII photochemistry (Fv/Fm) and nonphotochemical quenching (NPQ), which was aggravated by 1 mM salicylhydroxamic acid (SHAM; AOX inhibitor), in cucumber leaves during chilling”
Claim · model-written summary
Under low light, chilling did not change Fv/Fm in SHAM-treated cucumber leaves.
- Taxon
- cucumberCucumis sativust0
- Treatment
- chilling under low lighte0
- Outcome
- Fv/Fme0
- Direction
- did not changee0
- Qualifier
- SHAM-treated leavese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fv/Fm did not change and NPQ increased significantly in SHAM-treated leaves by chilling under low light”
t0“cucumber leaves”
Claim · model-written summary
Under low light, chilling significantly increased NPQ in SHAM-treated cucumber leaves.
- Taxon
- cucumberCucumis sativust0
- Treatment
- chilling under low lighte0
- Outcome
- NPQe0
- Direction
- increasede0
- Qualifier
- SHAM-treated leavese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fv/Fm did not change and NPQ increased significantly in SHAM-treated leaves by chilling under low light”
t0“cucumber leaves”
Claim · model-written summary
During recovery after chilling under low light, Fv/Fm, qP and ΦPSII returned to normal in chilled cucumber leaves with or without SHAM.
- Taxon
- cucumberCucumis sativust0
- Treatment
- chilling under low lighte0
- Outcome
- Fv/Fm, qP, ΦPSIIe0
- Direction
- return to normale0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During recovery periods after chilling under low light, Fv/Fm, qP, ΦPSII, NPQ, and Fv’/Fm’ could return to normal degree”
t0“cucumber leaves”
Claim · model-written summary
During recovery after chilling under low light, NPQ and Fv’/Fm’ returned to normal in chilled cucumber leaves with or without SHAM.
- Taxon
- cucumberCucumis sativust0
- Treatment
- chilling under low lighte0
- Outcome
- NPQ, and Fv’/Fm’e0
- Direction
- return to normale0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During recovery periods after chilling under low light, Fv/Fm, qP, ΦPSII, NPQ, and Fv’/Fm’ could return to normal degree”
t0“cucumber leaves”
Claim · model-written summary
High light caused a larger decrease of chlorophyll fluorescence parameters in chilled cucumber leaves during the recovery period.
- Taxon
- cucumberCucumis sativust0
- Treatment
- high lighte0
- Outcome
- chlorophyll fluorescence parameterse0
- Direction
- more decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high light induced more decrease of chlorophyll fluorescence parameters in chilled leaves during the recovery period”
t0“cucumber leaves”
Claim · model-written summary
SHAM treatment further aggravated the decrease of chlorophyll fluorescence parameters in high-light chilled cucumber leaves during recovery.
- Taxon
- cucumberCucumis sativust0
- Treatment
- SHAM treatmente0
- Outcome
- the decreasee0
- Direction
- further aggravatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SHAM treatment further aggravated the decrease”
t0“cucumber leaves”
Claim · model-written summary
Up-regulation of the AOX pathway in chilled cucumber leaves is concluded to play a critical role in protection against photoinhibition under excess light energy during chilling and recovery.
- Taxon
- cucumberCucumis sativust0
- Outcome
- protection against photoinhibitione0
- Qualifier
- under excess light energy conditione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“up-regulation of AOX pathway in chilled leaves plays a critical role in protection against photoinhibition in leaves under excess light energy condition during chilling and the subsequent recovery period”
t0“cucumber leaves”
Claim · model-written summary
Thermal energy dissipation was more important than AOX for preventing photoinhibition in cucumber leaves exposed to chilling under low light.
- Taxon
- cucumberCucumis sativust0
- Outcome
- prevent photoinhibitione0
- Qualifier
- thermal energy dissipation was more importante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“thermal energy dissipation was more important to prevent photoinhibition in leaves exposed to chilling under low light”
t0“cucumber leaves”
The same questions in other papers
cold · physiology: photosynthesis · Cucumis sativus (cucumber)Results differ
5 papers in the same direction as this paper · 33 in the opposite direction
- negative
- negative
- no effect
35 papers more in this group
See all 39 papers →light · physiology: photosynthesis · Cucumis sativus (cucumber)Positive and negative results
29 papers in the same direction as this paper · 29 in the opposite direction · 2 reporting no difference from an alternative
- negative
- no effect
- negative
57 papers more in this group
See all 61 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.