Abstract
Abstract Ca2+ starvation causes a remarkable increase in the level of alkaline phosphatase-isozyme which effectively hydrolyzes nucleoside di- and triphosphates but not nucleoside 5'-monophosphates, in cucumber roots (12). A comparison of adenine nucleotide contents between roots grown with or without Ca2+ was therefore attempted to see whether increased alkaline phosphatase plays a role in the regulation of nuc1eotide contents. ATP content of the Ca2+-starved roots did not significantly change during the first 3 days fo11owing the removal of Ca2+, and then rapidly decreased. On the other hand, the ATP content of the control roots increased, up to towfold, during the 3-day period, and thereafter decreased to the original level. The levels of both ADP and AMP decreased rapidly after Ca2+ starvation, while those in the control roots hardly changed throughout growth. With Ca2+ deficiency, the phosphohydrolyzing activities toward ATP and ADP greatly increased, but not toward AMP. Re-addition of Ca2+ to the deficient medium, which reverses the increase in the activity, had no effect on the ATP content. Thus, Ca2+ starvation caused a great reduction in a11 adenine nucleotide contents of the cucumber roots. It seems, however, that the changes in the nucleotides may not be directly regulated by the alkali ne phosphatase induced by Ca2+ starvation. Keywords: adenine nucleotidesCa2+ deficiencycucumber rootsphosphatase
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Claims 9
Claim · model-written summary
Calcium starvation increased alkaline phosphatase isozyme levels in cucumber roots.
- Taxon
- cucumber
Cucumis sativuse0 - Treatment
- Ca2+ starvatione0
- Gene
- alkaline phosphatase-isozymee0
- Outcome
- level of alkaline phosphatase-isozymee0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ca2+ starvation causes a remarkable increase in the level of alkaline phosphatase-isozyme which effectively hydrolyzes nucleoside di- and triphosphates but not nucleoside 5'-monophosphates, in cucumber roots (12).”
Claim · model-written summary
Cucumber root ATP did not change significantly during the first three days of calcium starvation, then fell rapidly.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Ca2+-starvede0
- Outcome
- ATP contente0
- Direction
- decreasede0
- Qualifier
- during the first 3 days fo11owing the removal of Ca2+e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ATP content of the Ca2+-starved roots did not significantly change during the first 3 days fo11owing the removal of Ca2+, and then rapidly decreased.”
t0“cucumber”
Claim · model-written summary
Control root ATP rose up to twofold during the first three days and then returned to its initial level.
- Taxon
- cucumberCucumis sativust0
- Outcome
- ATP contente0
- Direction
- increasede0
- Value
- towfolde0
- Qualifier
- during the 3-day periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the ATP content of the control roots increased, up to towfold, during the 3-day period, and thereafter decreased to the original level.”
t0“cucumber”
Claim · model-written summary
Cucumber root ADP and AMP rapidly decreased under calcium starvation.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Ca2+ starvatione0
- Outcome
- levels of both ADP and AMPe0
- Direction
- decreasede0
- Comparator
- control rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The levels of both ADP and AMP decreased rapidly after Ca2+ starvation, while those in the control roots hardly changed throughout growth.”
t0“cucumber”
Claim · model-written summary
Calcium deficiency increased cucumber root phosphohydrolysis toward ATP and ADP.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Ca2+ deficiencye0
- Outcome
- phosphohydrolyzing activities toward ATP and ADPe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With Ca2+ deficiency, the phosphohydrolyzing activities toward ATP and ADP greatly increased, but not toward AMP.”
t0“cucumber”
Claim · model-written summary
Calcium deficiency did not increase cucumber root phosphohydrolysis toward AMP.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Ca2+ deficiencye0
- Outcome
- toward AMPe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With Ca2+ deficiency, the phosphohydrolyzing activities toward ATP and ADP greatly increased, but not toward AMP.”
t0“cucumber”
Claim · model-written summary
Readdition of calcium reversed elevated phosphatase activity.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Re-addition of Ca2+ to the deficient mediume0
- Outcome
- activitye0
- Direction
- reverses the increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Re-addition of Ca2+ to the deficient medium, which reverses the increase in the activity, had no effect on the ATP content.”
t0“cucumber”
Claim · model-written summary
Readdition of calcium had no effect on cucumber root ATP content.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Re-addition of Ca2+ to the deficient mediume0
- Outcome
- ATP contente0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Re-addition of Ca2+ to the deficient medium, which reverses the increase in the activity, had no effect on the ATP content.”
t0“cucumber”
Claim · model-written summary
The authors infer that calcium-starvation nucleotide changes may not be directly regulated by induced alkaline phosphatase.
- Taxon
- cucumberCucumis sativust0
- Treatment
- Ca2+ starvatione0
- Outcome
- changes in the nucleotidese0
- Qualifier
- may not be directly regulated by the alkali ne phosphatasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the changes in the nucleotides may not be directly regulated by the alkali ne phosphatase induced by Ca2+ starvation.”
t0“cucumber”
The same questions in other papers
calcium(2+) · molecular: metabolites · Cucumis sativus (cucumber)Positive and negative results
4 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 papers →in vitro · molecular: metabolites · Cucumis sativus (cucumber)Results agree
2 papers in the same direction as this paper
- negative
- no effect
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.