Abstract
The effect of Ca on senescence was followed in detached cucumber (Cucumis sativus L.) cotyledons floating on various solutions in the dark. Compared with those in water, cotyledons in 10(-4) molar CaCl(2) exhibited reduced chlorophyll loss and H(2)O(2) production, reduced and delayed ethylene production, and did not undergo a burst in CO(2) production. In contrast, Mg had little effect on cotyledon senescence, whereas K stimulated chlorophyll loss but did not increase H(2)O(2) accumulation of ethylene and CO(2) production. This reduction in the rate of senescence by Ca could also be achieved by increasing the endogenous levels of Ca in the cotyledons before excision, although the reduction was less than that with Ca in the external solution. The addition of H(2)O(2) to the solutions on which cotyledons were floated stimulated chlorophyll breakdown, but effects on ethylene and CO(2) were not consistent.
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Claims 10
Claim · model-written summary
Calcium chloride reduced chlorophyll loss and peroxide production compared with water.
- Taxon
- cucumber
Cucumis sativust0 - Organ / stage
- cotyledonse0
- Treatment
- 10(-4) molar CaCl(2)e0
- Outcome
- chlorophyll loss and H(2)O(2) productione0
- Direction
- reducede0
- Comparator
- watere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with those in water, cotyledons in 10(-4) molar CaCl(2) exhibited reduced chlorophyll loss and H(2)O(2) production”
t0“cucumber”
Claim · model-written summary
Calcium chloride reduced and delayed ethylene production.
- Taxon
- cucumberCucumis sativust0
- Treatment
- 10(-4) molar CaCl(2)e0
- Outcome
- ethylene productione0
- Direction
- reduced and delayede0
- Comparator
- watere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with those in water, cotyledons in 10(-4) molar CaCl(2) exhibited reduced chlorophyll loss and H(2)O(2) production, reduced and delayed ethylene production”
t0“cucumber”
Claim · model-written summary
Calcium chloride prevented a burst of CO2 production.
- Taxon
- cucumberCucumis sativust0
- Treatment
- 10(-4) molar CaCl(2)e0
- Outcome
- burst in CO(2) productione0
- Direction
- did not undergoe0
- Comparator
- watere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with those in water, cotyledons in 10(-4) molar CaCl(2) exhibited reduced chlorophyll loss and H(2)O(2) production, reduced and delayed ethylene production, and did not undergo a burst in CO(2) production.”
t0“cucumber”
Claim · model-written summary
Magnesium had little effect on cotyledon senescence.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Mge0
- Outcome
- cotyledon senescencee0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mg had little effect on cotyledon senescence”
t0“cucumber”
Claim · model-written summary
Potassium stimulated chlorophyll loss.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Ke0
- Outcome
- chlorophyll losse0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K stimulated chlorophyll loss but did not increase H(2)O(2) accumulation of ethylene and CO(2) production.”
t0“cucumber”
Claim · model-written summary
Potassium did not increase peroxide accumulation.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Ke0
- Outcome
- H(2)O(2) accumulatione0
- Direction
- did not increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K stimulated chlorophyll loss but did not increase H(2)O(2) accumulation of ethylene and CO(2) production.”
t0“cucumber”
Claim · model-written summary
Potassium did not increase ethylene and CO2 production.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Ke0
- Outcome
- ethylene and CO(2) productione0
- Direction
- did not increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K stimulated chlorophyll loss but did not increase H(2)O(2) accumulation of ethylene and CO(2) production.”
t0“cucumber”
Claim · model-written summary
Increasing endogenous calcium before excision reduced senescence less than external calcium.
- Taxon
- cucumberCucumis sativust0
- Treatment
- increasing the endogenous levels of Ca in the cotyledons before excisione0
- Outcome
- rate of senescencee0
- Direction
- reduction was lesse0
- Comparator
- Ca in the external solutione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This reduction in the rate of senescence by Ca could also be achieved by increasing the endogenous levels of Ca in the cotyledons before excision, although the reduction was less than that with Ca in the external solution.”
t0“cucumber”
Claim · model-written summary
Added peroxide stimulated chlorophyll breakdown.
- Taxon
- cucumberCucumis sativust0
- Treatment
- addition of H(2)O(2)e0
- Outcome
- chlorophyll breakdowne0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The addition of H(2)O(2) to the solutions on which cotyledons were floated stimulated chlorophyll breakdown”
t0“cucumber”
Claim · model-written summary
Added peroxide had inconsistent effects on ethylene and CO2.
- Taxon
- cucumberCucumis sativust0
- Treatment
- addition of H(2)O(2)e0
- Outcome
- ethylene and CO(2)e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The addition of H(2)O(2) to the solutions on which cotyledons were floated stimulated chlorophyll breakdown, but effects on ethylene and CO(2) were not consistent.”
t0“cucumber”
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See all 8 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.