Abstract
Plants often suffer from hypoxic stress during waterlogging and hydroponic culturing. This study investigated the response of cucumber ( Cucumis sativus L.) plant growth parameters, leaf photosynthesis, chlorophyll fluorescence, fast chlorophyll a fluorescence transient (OJIP), and fruit quality parameters to hypoxic stress alleviated by exogenous calcium. During the fruiting period, cucumber plants were exposed to hypoxia and hypoxia + Ca 2+ treatment (4 mM Ca 2+ ) for 9 d. Exogenous calcium application enhanced the biomass and fruit quality of hypoxic stressed cucumber and also increased the net photosynthesis rate, stomatal conductance, intercellular CO 2 concentration, maximum quantum efficiency of photosystem II photochemistry, actual photochemical efficiency of PSII, photochemical quenching coefficient, and non-photochemical quenching coefficient. Additionally, measurement of chlorophyll a fluorescence transients showed the positive K- and L-bands were more pronounced in leaves treated with hypoxia compared with those with hypoxia + Ca 2+ , indicating that hypoxic treatment induced uncoupling of the oxygen-evolving complex and inhibited electron transport beyond plastoquinone pool (Q a , Q b ) including possible constraints on the reduction of end electron acceptors of photosystem I. Exogenous calcium can reduce these stress-induced damages in cucumber. This research focused the effect of exogenous calcium on cucumber photosynthesis during the fruiting period under hypoxic stress. Hypoxic stress might impair the photosynthetic electron-transport chain from the donor side of PSII up to the reduction of end acceptors of PSI, and exogenous calcium enhanced electron transport capacity and reduced hypoxic damage of cucumber leaves.
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Claims 7
Claim · model-written summary
Calcium enhanced biomass in hypoxic cucumber.
- Taxon
- cucumber
Cucumis sativuse0 - Treatment
- Exogenous calcium applicatione0
- Outcome
- biomasse0
- Direction
- enhancede0
- Comparator
- hypoxic stressed cucumbere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenous calcium application enhanced the biomass and fruit quality of hypoxic stressed cucumber”
Claim · model-written summary
Calcium enhanced fruit quality in hypoxic cucumber.
- Taxon
- cucumberCucumis sativuse0
- Organ / stage
- fruite0
- Treatment
- Exogenous calcium applicatione0
- Outcome
- fruit qualitye0
- Direction
- enhancede0
- Comparator
- hypoxic stressed cucumbere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenous calcium application enhanced the biomass and fruit quality of hypoxic stressed cucumber”
Claim · model-written summary
Calcium increased net photosynthesis rate, stomatal conductance and intercellular CO 2 concentration under hypoxia.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- Exogenous calcium applicatione0
- Outcome
- net photosynthesis rate, stomatal conductance, intercellular CO 2 concentratione0
- Direction
- increasede0
- Comparator
- hypoxic stressed cucumbere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenous calcium application enhanced the biomass and fruit quality of hypoxic stressed cucumber and also increased the net photosynthesis rate, stomatal conductance, intercellular CO 2 concentration”
Claim · model-written summary
Calcium increased maximum and actual PSII photochemical efficiencies and photochemical quenching coefficient.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- Exogenous calcium applicatione0
- Outcome
- maximum quantum efficiency of photosystem II photochemistry, actual photochemical efficiency of PSII, photochemical quenching coefficiente0
- Direction
- increasede0
- Comparator
- hypoxic stressed cucumbere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenous calcium application enhanced the biomass and fruit quality of hypoxic stressed cucumber and also increased the net photosynthesis rate, stomatal conductance, intercellular CO 2 concentration, maximum quantum efficiency of photosystem II photochemistry, actual photochemical efficiency of PSII, photochemical quenching coefficient”
Claim · model-written summary
Calcium increased the non-photochemical quenching coefficient.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- Exogenous calcium applicatione0
- Outcome
- non-photochemical quenching coefficiente0
- Direction
- increasede0
- Comparator
- hypoxic stressed cucumbere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenous calcium application enhanced the biomass and fruit quality of hypoxic stressed cucumber and also increased the net photosynthesis rate, stomatal conductance, intercellular CO 2 concentration, maximum quantum efficiency of photosystem II photochemistry, actual photochemical efficiency of PSII, photochemical quenching coefficient, and non-photochemical quenching coefficient”
Claim · model-written summary
Positive K- and L-bands were more pronounced with hypoxia than with hypoxia plus calcium.
- Taxon
- cucumberCucumis sativust0
- Organ / stage
- leavese0
- Treatment
- hypoxiae0
- Outcome
- positive K- and L-bandse0
- Direction
- more pronouncede0
- Comparator
- hypoxia + Ca 2+e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the positive K- and L-bands were more pronounced in leaves treated with hypoxia compared with those with hypoxia + Ca 2+”
t0“cucumber”
Claim · model-written summary
Authors interpret hypoxia as impairing photosynthetic electron transport and calcium as reducing the damage.
- Taxon
- cucumberCucumis sativuse0
- Organ / stage
- leavese0
- Treatment
- Hypoxic stresse0
- Outcome
- photosynthetic electron-transport chaine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hypoxic stress might impair the photosynthetic electron-transport chain from the donor side of PSII up to the reduction of end acceptors of PSI, and exogenous calcium enhanced electron transport capacity and reduced hypoxic damage of cucumber leaves.”
The same questions in other papers
calcium atom · physiology: photosynthesis · Cucumis sativus (cucumber)Positive and negative results
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- no effect
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See all 7 papers →calcium atom · growth · Cucumis sativus (cucumber)Positive and negative results
15 papers in the same direction as this paper · 10 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- negative
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23 papers more in this group
See all 27 papers →calcium atom · quality: grain · Cucumis sativus (cucumber)Results agree
1 paper in the same direction as this paper
- positive
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.