Abstract
Growth of young cucumber plants was strongly inhibited, when calcium was removed from the culture solution. The activities of nitrate reductase, glutamate dehydrogenase and glutamine synthetase were investigated after the removal of calcium. Though the activities of glutamine synthetase and glutamate dehydrogenase were not altered much, nitrate reductase activity, measured by in vitro and in vivo assays, decreased dramatically. The loss of nitrate reductase activity coincided with the level of nitrate in the leaves. When nitrate was supplied to the cucumbers with a nitrate deficiency, the plants induced nitrate reductase together with a distinct accumulation of nitrate. However, cucumbers treated for both calcium and nitrate deficiency failed to induce nitrate reductase and to accumulate nitrate on the addition of large amounts of nitrate. Leaf sections that had been treated for both calcium and nitrate deficiency could induce nitrate reductase when floated on nitrate solution under the light. This indicates that the drastic loss of nitrate reductase caused by the removal of calcium was due mainly to the deficiency of nitrate as the inducer in leaves.
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Claims 10
Claim · model-written summary
Removing calcium strongly inhibited growth of young cucumber plants.
- Taxon
- cucumber
Cucumis sativuse0 - Organ / stage
- younge0
- Treatment
- calcium was removed from the culture solutione0
- Outcome
- Growthe0
- Direction
- strongly inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth of young cucumber plants was strongly inhibited, when calcium was removed from the culture solution.”
Claim · model-written summary
Calcium removal changed glutamine synthetase and glutamate dehydrogenase activities little.
- Taxon
- cucumberCucumis sativust0
- Organ / stage
- leavest0
- Treatment
- calciume1
- Outcome
- activities of glutamine synthetase and glutamate dehydrogenasee0
- Direction
- not altered muche0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Though the activities of glutamine synthetase and glutamate dehydrogenase were not altered much, nitrate reductase activity, measured by in vitro and in vivo assays, decreased dramatically.”
e1“Growth of young cucumber plants was strongly inhibited, when calcium was removed from the culture solution.”
t0“cucumber leaves”
Claim · model-written summary
Calcium removal dramatically decreased leaf nitrate reductase activity.
- Taxon
- cucumberCucumis sativust0
- Organ / stage
- leavest0
- Treatment
- calcium deficiencyt0
- Outcome
- nitrate reductase activitye0
- Direction
- decreased dramaticallye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrate reductase activity, measured by in vitro and in vivo assays, decreased dramatically.”
t0“Repression of nitrate reductase in cucumber leaves caused by calcium deficiency”
Claim · model-written summary
Loss of leaf nitrate reductase activity coincided with leaf nitrate level.
- Taxon
- cucumberCucumis sativust0
- Organ / stage
- leavese0
- Compound
- nitratee0
- Outcome
- nitrate reductase activitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The loss of nitrate reductase activity coincided with the level of nitrate in the leaves.”
t0“cucumber leaves”
Claim · model-written summary
Nitrate supply to nitrate-deficient cucumbers induced nitrate reductase.
- Taxon
- cucumbersCucumis sativuse0
- Treatment
- nitrate was suppliede0
- Outcome
- nitrate reductasee0
- Direction
- inducede0
- Qualifier
- with a nitrate deficiencye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When nitrate was supplied to the cucumbers with a nitrate deficiency, the plants induced nitrate reductase together with a distinct accumulation of nitrate.”
Claim · model-written summary
Nitrate supply to nitrate-deficient cucumbers caused distinct nitrate accumulation.
- Taxon
- cucumbersCucumis sativuse0
- Treatment
- nitrate was suppliede0
- Outcome
- accumulation of nitratee0
- Direction
- accumulatione0
- Qualifier
- with a nitrate deficiencye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When nitrate was supplied to the cucumbers with a nitrate deficiency, the plants induced nitrate reductase together with a distinct accumulation of nitrate.”
Claim · model-written summary
Cucumbers deficient in calcium and nitrate failed to induce nitrate reductase after nitrate addition.
- Taxon
- cucumbersCucumis sativuse0
- Treatment
- addition of large amounts of nitratee0
- Outcome
- nitrate reductasee0
- Direction
- failed to inducee0
- Qualifier
- both calcium and nitrate deficiencye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, cucumbers treated for both calcium and nitrate deficiency failed to induce nitrate reductase and to accumulate nitrate on the addition of large amounts of nitrate.”
Claim · model-written summary
Cucumbers deficient in calcium and nitrate failed to accumulate nitrate after nitrate addition.
- Taxon
- cucumbersCucumis sativuse0
- Treatment
- addition of large amounts of nitratee0
- Outcome
- accumulate nitratee0
- Direction
- failed toe0
- Qualifier
- both calcium and nitrate deficiencye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, cucumbers treated for both calcium and nitrate deficiency failed to induce nitrate reductase and to accumulate nitrate on the addition of large amounts of nitrate.”
Claim · model-written summary
Calcium- and nitrate-deficient leaf sections induced nitrate reductase when floated on nitrate solution in light.
- Taxon
- cucumberCucumis sativust0
- Organ / stage
- Leaf sectionse0
- Treatment
- floated on nitrate solution under the lighte0
- Outcome
- nitrate reductasee0
- Direction
- inducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf sections that had been treated for both calcium and nitrate deficiency could induce nitrate reductase when floated on nitrate solution under the light.”
t0“cucumber leaves”
Claim · model-written summary
The authors attribute nitrate reductase loss after calcium removal mainly to insufficient leaf nitrate inducer.
- Taxon
- cucumberCucumis sativust0
- Organ / stage
- leavese0
- Treatment
- removal of calciume0
- Compound
- nitratee0
- Outcome
- drastic loss of nitrate reductasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This indicates that the drastic loss of nitrate reductase caused by the removal of calcium was due mainly to the deficiency of nitrate as the inducer in leaves.”
t0“cucumber leaves”
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See all 17 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.