Abstract
Nitrate and total nitrogen contents, and nitrate reductase (NR) activity of the excised maize roots in buffered or unbuffered nitrate solution (at pH 6.5 or 4.5) as affected by putrescine (PUT), abscisic acid (ABA) and salicylic acid (SA) were investigated. In unbufferred solution, the NR activity was lower at pH 4.5 as compared to that at pH 6.5, but in bufferred solution the activity was higher at lower pH. Supply of 100 µM PUT or 500 µM SA, promoted NR activity and 50 µM ABA inhibited the activity at pH 6.5. However, at pH 4.5, PUT and SA inhibited NR activity and ABA had no effect. In most cases, the increase in NR activity was positively correlated with total organic nitrogen and a negatively with nitrate content. A reverse situation was found when NR activity was inhibited by the growth regulators.
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Claims 11
Claim · model-written summary
In unbuffered solution, nitrate reductase activity was lower at pH 4.5 than pH 6.5.
- Organ / stage
- rootse1
- Treatment
- pH 4.5e0
- Outcome
- NR activitye0
- Direction
- lowere0
- Qualifier
- unbufferred solutione0
- Comparator
- pH 6.5e0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In unbufferred solution, the NR activity was lower at pH 4.5 as compared to that at pH 6.5”
e1“excised maize roots”
Claim · model-written summary
In buffered solution, nitrate reductase activity was higher at lower pH.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in bufferred solution the activity was higher at lower pH”
e1“Nitrate and total nitrogen contents, and nitrate reductase (NR) activity of the excised maize roots”
Claim · model-written summary
100 µM PUT promoted nitrate reductase activity at pH 6.5.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Supply of 100 µM PUT or 500 µM SA, promoted NR activity and 50 µM ABA inhibited the activity at pH 6.5.”
e1“excised maize roots”
Claim · model-written summary
500 µM SA promoted nitrate reductase activity at pH 6.5.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Supply of 100 µM PUT or 500 µM SA, promoted NR activity and 50 µM ABA inhibited the activity at pH 6.5.”
e1“excised maize roots”
Claim · model-written summary
50 µM ABA inhibited nitrate reductase activity at pH 6.5.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Supply of 100 µM PUT or 500 µM SA, promoted NR activity and 50 µM ABA inhibited the activity at pH 6.5.”
e1“excised maize roots”
Claim · model-written summary
PUT inhibited nitrate reductase activity at pH 4.5.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at pH 4.5, PUT and SA inhibited NR activity and ABA had no effect”
e1“excised maize roots”
Claim · model-written summary
SA inhibited nitrate reductase activity at pH 4.5.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at pH 4.5, PUT and SA inhibited NR activity and ABA had no effect”
e1“excised maize roots”
Claim · model-written summary
ABA had no effect on nitrate reductase activity at pH 4.5.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at pH 4.5, PUT and SA inhibited NR activity and ABA had no effect”
e1“excised maize roots”
Claim · model-written summary
In most cases increased nitrate reductase activity correlated positively with total organic nitrogen.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In most cases, the increase in NR activity was positively correlated with total organic nitrogen and a negatively with nitrate content.”
e1“excised maize roots”
Claim · model-written summary
Increased nitrate reductase activity correlated negatively with nitrate content.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In most cases, the increase in NR activity was positively correlated with total organic nitrogen and a negatively with nitrate content.”
e1“excised maize roots”
Claim · model-written summary
The opposite nitrogen relationships occurred when growth regulators inhibited nitrate reductase activity.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A reverse situation was found when NR activity was inhibited by the growth regulators.”
e1“In most cases, the increase in NR activity was positively correlated with total organic nitrogen and a negatively with nitrate content.”
e2“excised maize roots”
The same questions in other papers
(+)-abscisic acid · physiology: enzyme activity · Zea mays (maize)Positive and negative results
2 papers in the same direction as this paper · 5 in the opposite direction
- positive
- positive
- positive
4 papers more in this group
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.