Abstract
Summary Two cucumber ( Cucumis sativus L.) cultivars, including the shade-susceptible cv. 'Jingyan 2' and shade-tolerant cv. 'Deltastar', were compared for the changes in gas exchange and chlorophyll a fluorescent parameters during rapid dehydration of mature leaves detached from seedlings grown for 20 days under low light (PFD: 75-85 µmol m -2 s -1 ). During the continuous water loss process after separation from plants, leaf net photosynthesis rate (Pn), transpiration rate (Tr), efficiency of excitation energy captured by open photosystem II (PSII) reaction centre (Fv′/Fm′), quantum efficiency of PSII photochemistry (ΦPSII) and partitioning proportion for photochemical reaction of light energy absorbed by PSII (P) gradually decreased, the antennae heat dissipation (D) and reaction centres dissipation of light energy absorbed by PSII (Ex) gradually increased, and the maximal photochemical efficiency of PSII (Fv/Fm) remained largely stable. The declining of the photosynthetic parameters was faster and lasted shorter period than the fluorescent parameters. The impact of dehydration was much more severe in the control plants grown under normal light intensity, which indicates that plants grown under low light had improved tolerance to subsequent water deficient stress. Between the two cultivars both exposed to low light, cv. 'Deltastar' was able to maintain more stable chl fluorescence, photosynthetic parameters and the critical water content during rapid dehydration process. These characteristics may account for the better tolerance to shade and drought condition of 'Deltastar' compared to 'Jingyan 2'.
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Claims 7
Claim · model-written summary
During dehydration, net photosynthesis, transpiration and PSII photochemical efficiencies declined.
- Taxon
- cucumber
Cucumis sativust0 - Organ / stage
- leafe0
- Outcome
- leaf net photosynthesis rate (Pn), transpiration rate (Tr), efficiency of excitation energy captured by open photosystem II (PSII) reaction centre (Fv′/Fm′)e0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf net photosynthesis rate (Pn), transpiration rate (Tr), efficiency of excitation energy captured by open photosystem II (PSII) reaction centre (Fv′/Fm′), quantum efficiency of PSII photochemistry (ΦPSII) and partitioning proportion for photochemical reaction of light energy absorbed by PSII (P) gradually decreased”
t0“cucumber”
Claim · model-written summary
PSII photochemistry and photochemical energy partitioning decreased during dehydration.
- Taxon
- cucumberCucumis sativust0
- Outcome
- quantum efficiency of PSII photochemistry (ΦPSII) and partitioning proportion for photochemical reaction of light energy absorbed by PSII (P)e0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“quantum efficiency of PSII photochemistry (ΦPSII) and partitioning proportion for photochemical reaction of light energy absorbed by PSII (P) gradually decreased”
t0“cucumber”
Claim · model-written summary
Antenna heat dissipation and reaction-centre dissipation increased during dehydration.
- Taxon
- cucumberCucumis sativust0
- Outcome
- antennae heat dissipation (D) and reaction centres dissipation of light energy absorbed by PSII (Ex)e0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the antennae heat dissipation (D) and reaction centres dissipation of light energy absorbed by PSII (Ex) gradually increased”
t0“cucumber”
Claim · model-written summary
Maximum PSII photochemical efficiency remained largely stable during dehydration.
- Taxon
- cucumberCucumis sativust0
- Outcome
- maximal photochemical efficiency of PSII (Fv/Fm)e0
- Direction
- remained largely stablee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maximal photochemical efficiency of PSII (Fv/Fm) remained largely stable”
t0“cucumber”
Claim · model-written summary
Photosynthetic parameters declined faster and for a shorter period than fluorescence parameters.
- Taxon
- cucumberCucumis sativust0
- Outcome
- photosynthetic parameterse0
- Direction
- fastere0
- Comparator
- fluorescent parameterse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The declining of the photosynthetic parameters was faster and lasted shorter period than the fluorescent parameters”
t0“cucumber”
Claim · model-written summary
Dehydration had a more severe impact in normal-light controls than low-light-grown plants.
- Taxon
- cucumberCucumis sativust0
- Treatment
- low lighte0
- Outcome
- tolerance to subsequent water deficient stresse0
- Direction
- improvede0
- Comparator
- control plants grown under normal light intensitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“impact of dehydration was much more severe in the control plants grown under normal light intensity, which indicates that plants grown under low light had improved tolerance to subsequent water deficient stress”
t0“cucumber”
Claim · model-written summary
Deltastar maintained more stable fluorescence, photosynthetic parameters and critical water content than Jingyan 2 during rapid dehydration.
- Taxon
- cucumberCucumis sativust0
- Material
- Deltastare0
- Outcome
- chl fluorescence, photosynthetic parameters and the critical water contente0
- Direction
- more stablee0
- Comparator
- Jingyan 2e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cv. 'Deltastar' was able to maintain more stable chl fluorescence, photosynthetic parameters and the critical water content during rapid dehydration process”
e1“'Deltastar' compared to 'Jingyan 2'”
t0“cucumber”
The same questions in other papers
light · disease · Cucumis sativus (cucumber)Positive and negative results
4 papers in the same direction as this paper · 6 in the opposite direction
- no effect
- no effect
- negative
7 papers more in this group
See all 11 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.