Abstract
In Zea mays L., addition of glucose to the induction medium has no effect on the induction of nitrate reductase during the initial 3 hours either in root tips (0-10 mm) or mature root sections (25-35 mm). With longer times, higher levels of enzyme activity are recovered from both root segments when glucose is present in the incubation medium. The induction in root tips is saturated by 10 mm NO(3) (-). Higher concentrations of NO(3) (-) are required for saturation in mature root sections. The response to glucose is seen over a wide range of external NO(3) (-) concentrations.Nitrate reductase activity is lost rapidly when nitrate is withdrawn from the induction medium. Additions of glucose do not prevent this loss. Additions of glucose have no effect on total uptake of NO(3) (-) by the root segments but they increase the anaerobic NO(2) (-) production in both root tips and mature root segments. This latter measurement is considered to be an estimate of an active NO(3) (-) pool in the cytoplasm. Thus the results show that glucose alters the distribution of NO(3) (-) within the root sections. This may be an important factor in controlling the in vivo stability of the enzyme or its rate of synthesis.
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Claims 10
Claim · model-written summary
Glucose had no effect on initial nitrate reductase induction in corn root tips and mature sections.
- Treatment
- addition of glucosee0
- Outcome
- induction of nitrate reductasee0
- Direction
- no effecte0
- Qualifier
- during the initial 3 hourse0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In Zea mays L., addition of glucose to the induction medium has no effect on the induction of nitrate reductase during the initial 3 hours either in root tips (0-10 mm) or mature root sections (25-35 mm).”
Claim · model-written summary
At longer times, glucose increased nitrate reductase activity in both corn root segments.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With longer times, higher levels of enzyme activity are recovered from both root segments when glucose is present in the incubation medium.”
e1“Zea mays L.”
Claim · model-written summary
Nitrate reductase induction in corn root tips saturated at 10 mm nitrate.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The induction in root tips is saturated by 10 mm NO(3) (-).”
e1“Zea mays L.”
Claim · model-written summary
Mature corn root sections required higher nitrate concentrations for saturation.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher concentrations of NO(3) (-) are required for saturation in mature root sections.”
e1“Zea mays L.”
Claim · model-written summary
Corn root glucose response occurred across a wide range of external nitrate concentrations.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The response to glucose is seen over a wide range of external NO(3) (-) concentrations.”
e1“Zea mays L.”
Claim · model-written summary
Nitrate reductase activity was rapidly lost after nitrate withdrawal.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate reductase activity is lost rapidly when nitrate is withdrawn from the induction medium.”
e1“Zea mays L.”
Claim · model-written summary
Glucose did not prevent nitrate reductase activity loss after nitrate withdrawal.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrate reductase activity is lost rapidly when nitrate is withdrawn from the induction medium. Additions of glucose do not prevent this loss.”
e1“Zea mays L.”
Claim · model-written summary
Glucose had no effect on total nitrate uptake by corn root segments.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Additions of glucose have no effect on total uptake of NO(3) (-) by the root segments”
e1“Zea mays L.”
Claim · model-written summary
Glucose increased anaerobic nitrite production in corn root tips and mature segments.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“they increase the anaerobic NO(2) (-) production in both root tips and mature root segments”
e1“Additions of glucose have no effect on total uptake”
e2“Zea mays L.”
Claim · model-written summary
The authors concluded that glucose alters nitrate distribution within corn root sections.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thus the results show that glucose alters the distribution of NO(3) (-) within the root sections.”
e1“Zea mays L.”
The same questions in other papers
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glucose · nutrient: content · Zea mays (maize)Positive and negative results
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glucose · molecular: expression · Zea mays (maize)Positive and negative results
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nitrogen · physiology: enzyme activity · Zea mays (maize)Positive and negative results
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30 papers more in this group
See all 34 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.