Abstract
Abstract Nitrate reductase activity was inhibited as a result of reduced soil moisture potentials or application of NaCI to nutrient solutions. The decrease in enzyme activity of wheat seedlings exposed to salinity, was found 24 hours after exposure to stress. The effect of stress on nitrate reductase was found in cell‐free extracts as well as in riro in assays of intact leaf sections. A recovery in enzyme activity was found after irrigation or after removal of seedlings from salinity. While relative water content of the leaves was restored within 3 hours after removal of stress, full recovery of enzyme activity occurred only after 24 hours. Cycloheximide and chloramphenicol suppressed the activity of nitrate reductase in non‐stressed seedlings, but had no effect on the activity of plants exposed to salinity. However, during removal of stress, cycloheximide prevented completely the recovery of nitrate reductase, while chloramphenicol did not interfere with the recovery of the inhibited enzyme activity. It is concluded that a fraction of nitrate reductase may be located in the cytoplasm and lost activity during stress, probably due to inhibited protein synthesis. Another fraction which may be associated with chloroplasts, was inhibited by stress due to conformational changes or partial denaturation.
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Claims 16
Claim · model-written summary
Reduced soil moisture inhibited nitrate reductase activity.
- Taxon
- Wheat
Triticum aestivumt0 - Treatment
- reduced soil moisture potentialse0
- Gene
- Nitrate reductasee0
- Outcome
- Nitrate reductase activitye0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Seedlings”
e0“Nitrate reductase activity was inhibited as a result of reduced soil moisture potentials”
Claim · model-written summary
NaCI application inhibited nitrate reductase activity.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- application of NaCI to nutrient solutionse0
- Gene
- Nitrate reductasee0
- Outcome
- Nitrate reductase activitye0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Seedlings”
e0“Nitrate reductase activity was inhibited as a result of reduced soil moisture potentials or application of NaCI to nutrient solutions”
Claim · model-written summary
Salinity decreased nitrate reductase activity after 24 hours.
- Taxon
- wheatTriticum aestivume0
- Treatment
- salinitye0
- Outcome
- decrease in enzyme activitye0
- Direction
- decreasee0
- Qualifier
- 24 hours after exposure to stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decrease in enzyme activity of wheat seedlings exposed to salinity, was found 24 hours after exposure to stress”
Claim · model-written summary
Stress affected nitrate reductase activity in cell-free extracts and intact leaf assays.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- intact leaf sectionse0
- Outcome
- effect of stress on nitrate reductasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Seedlings”
e0“The effect of stress on nitrate reductase was found in cell‐free extracts as well as in riro in assays of intact leaf sections”
Claim · model-written summary
Irrigation restored nitrate reductase activity.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- irrigatione0
- Outcome
- enzyme activitye0
- Direction
- recoverye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Seedlings”
e0“A recovery in enzyme activity was found after irrigation”
Claim · model-written summary
Removal from salinity restored nitrate reductase activity.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- removal of seedlings from salinitye0
- Outcome
- enzyme activitye0
- Direction
- recoverye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Seedlings”
e0“A recovery in enzyme activity was found after irrigation or after removal of seedlings from salinity”
Claim · model-written summary
Leaf relative water content was restored within 3 hours after stress removal.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- leavese0
- Outcome
- relative water contente0
- Direction
- restorede0
- Value
- 3 hourse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Seedlings”
e0“relative water content of the leaves was restored within 3 hours after removal of stress”
Claim · model-written summary
Full enzyme activity recovery took 24 hours after stress removal.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- enzyme activitye0
- Direction
- recoverye0
- Value
- 24 hourse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Seedlings”
e0“full recovery of enzyme activity occurred only after 24 hours”
Claim · model-written summary
Cycloheximide suppressed nitrate reductase activity in non-stressed seedlings.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- Cycloheximidee0
- Outcome
- activity of nitrate reductasee0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Seedlings”
e0“Cycloheximide and chloramphenicol suppressed the activity of nitrate reductase in non‐stressed seedlings”
Claim · model-written summary
Chloramphenicol suppressed nitrate reductase activity in non-stressed seedlings.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- chloramphenicole0
- Outcome
- activity of nitrate reductasee0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Seedlings”
e0“Cycloheximide and chloramphenicol suppressed the activity of nitrate reductase in non‐stressed seedlings”
Claim · model-written summary
Cycloheximide had no effect on enzyme activity in salinity-exposed plants.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- Cycloheximidee0
- Outcome
- activity of plants exposed to salinitye0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Seedlings”
e0“Cycloheximide and chloramphenicol suppressed the activity of nitrate reductase in non‐stressed seedlings, but had no effect on the activity of plants exposed to salinity”
Claim · model-written summary
Chloramphenicol had no effect on enzyme activity in salinity-exposed plants.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- chloramphenicole0
- Outcome
- activity of plants exposed to salinitye0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Seedlings”
e0“Cycloheximide and chloramphenicol suppressed the activity of nitrate reductase in non‐stressed seedlings, but had no effect on the activity of plants exposed to salinity”
Claim · model-written summary
Cycloheximide completely prevented recovery after stress removal.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- cycloheximidee0
- Outcome
- recovery of nitrate reductasee0
- Direction
- prevented completelye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Seedlings”
e0“during removal of stress, cycloheximide prevented completely the recovery of nitrate reductase”
Claim · model-written summary
Chloramphenicol did not interfere with recovery after stress removal.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- chloramphenicole0
- Outcome
- recovery of the inhibited enzyme activitye0
- Direction
- did not interferee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Seedlings”
e0“chloramphenicol did not interfere with the recovery of the inhibited enzyme activity”
Claim · model-written summary
The authors suggest a cytoplasmic nitrate reductase fraction loses activity during stress because protein synthesis is inhibited.
- Taxon
- WheatTriticum aestivumt0
- Gene
- nitrate reductasee0
- Outcome
- lost activity during stresse0
- Qualifier
- inhibited protein synthesise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Seedlings”
e0“a fraction of nitrate reductase may be located in the cytoplasm and lost activity during stress, probably due to inhibited protein synthesis”
Claim · model-written summary
The authors suggest a chloroplast-associated fraction is inhibited by stress through conformational change or partial denaturation.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- inhibited by stresse0
- Qualifier
- conformational changes or partial denaturatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat Seedlings”
e0“Another fraction which may be associated with chloroplasts, was inhibited by stress due to conformational changes or partial denaturation”
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See all 32 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.