Abstract
Factors affecting nitrate reduction by leaf discs of cotton (Gossypium hirsutum L.) were investigated. When incubated in 30 mm nitrate, discs reduced nitrate much more slowly under air or O(2) than under N(2). Inhibition by O(2) did not occur at nitrate levels of 100 mm or greater. Treatment with arsenate had little effect under N(2) but stimulated nitrate reduction under air. Similarly, ammonium inhibited nitrate reduction, with the inhibition being partially relieved by arsenate. Uptake of nitrate was unaffected by ammonium. The NAD/NADH ratio increased in response to both oxygen and ammonium. The effects of these treatments on nitrate reduction can be explained by competition with nitrate for NADH generated by glycolysis.
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Claims 10
Claim · model-written summary
Cotton leaf discs reduced nitrate more slowly under air or oxygen than nitrogen at 30 mm nitrate.
- Taxon
- Cotton
Gossypium hirsutumt0 - Treatment
- air or O(2)e0
- Outcome
- reduced nitratee0
- Direction
- much more slowlye0
- Qualifier
- 30 mm nitratee0
- Comparator
- N(2)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When incubated in 30 mm nitrate, discs reduced nitrate much more slowly under air or O(2) than under N(2).”
t0“Cotton”
Claim · model-written summary
Oxygen did not inhibit nitrate reduction at nitrate concentrations of 100 mm or higher.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- O(2)e0
- Outcome
- Inhibitione0
- Direction
- did not occure0
- Qualifier
- 100 mm or greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inhibition by O(2) did not occur at nitrate levels of 100 mm or greater.”
t0“Cotton”
Claim · model-written summary
Arsenate had little effect on nitrate reduction under nitrogen.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- arsenatee0
- Outcome
- nitrate reductione0
- Direction
- little effecte0
- Qualifier
- under N(2)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment with arsenate had little effect under N(2) but stimulated nitrate reduction under air.”
t0“Cotton”
Claim · model-written summary
Arsenate stimulated nitrate reduction under air.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- arsenatee0
- Outcome
- nitrate reductione0
- Direction
- stimulatede0
- Qualifier
- under aire0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment with arsenate had little effect under N(2) but stimulated nitrate reduction under air.”
t0“Cotton”
Claim · model-written summary
Ammonium inhibited nitrate reduction.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- ammoniume0
- Outcome
- nitrate reductione0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Similarly, ammonium inhibited nitrate reduction, with the inhibition being partially relieved by arsenate.”
t0“Cotton”
Claim · model-written summary
Arsenate partially relieved the ammonium inhibition of nitrate reduction.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- arsenatee0
- Outcome
- inhibitione0
- Direction
- partially relievede0
- Qualifier
- ammoniume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ammonium inhibited nitrate reduction, with the inhibition being partially relieved by arsenate.”
t0“Cotton”
Claim · model-written summary
Ammonium did not affect nitrate uptake.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- ammoniume0
- Outcome
- Uptake of nitratee0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Uptake of nitrate was unaffected by ammonium.”
t0“Cotton”
Claim · model-written summary
Oxygen increased the NAD/NADH ratio.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- oxygene0
- Outcome
- NAD/NADH ratioe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The NAD/NADH ratio increased in response to both oxygen and ammonium.”
t0“Cotton”
Claim · model-written summary
Ammonium increased the NAD/NADH ratio.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- ammoniume0
- Outcome
- NAD/NADH ratioe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The NAD/NADH ratio increased in response to both oxygen and ammonium.”
t0“Cotton”
Claim · model-written summary
The authors explain treatment effects by competition with nitrate for glycolytic NADH.
- Taxon
- CottonGossypium hirsutumt0
- Outcome
- nitrate reductione0
- Qualifier
- competition with nitrate for NADH generated by glycolysise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects of these treatments on nitrate reduction can be explained by competition with nitrate for NADH generated by glycolysis.”
t0“Cotton”
The same questions in other papers
arsenate ion · nutrient: content · Gossypium hirsutum (cotton)Results agree
1 paper in the same direction as this paper
- positive
nitrogen · nutrient: content · Gossypium hirsutum (cotton)Positive and negative results
7 papers in the same direction as this paper · 71 in the opposite direction
- positive
- positive
- positive
75 papers more in this group
See all 79 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.