Abstract
The effect of nitrogen status on phosphorous uptake and translocation was examined in 6-day-old dark-grown decapitated maize seedlings exposed to 25 micromolar phosphorous. Transfer to complete solutions containing 1 millimolar ammonium resulted in an increase in phosphorous uptake rate after 6 to 8 hours. The stimulus remained effective for at least 5.5 hours upon subsequent transfer to nitrogen-free solutions. Pretreatments for 16 hours with either nitrate or ammonium resulted in enhanced rates of subsequent phosphorous uptake and in enhanced translocation to the xylem of the exogenously supplied phosphorous. Both processes reached a plateau following pretreatment with 0.1 to 1.0 millimolar concentrations of either nitrogen ion. Further enhancement occurred with 10 millimolar nitrate, but not with 10 millimolar ammonium pretreatment. Although nitrogen pretreatments slightly increased the quantity of exogenous phosphorous retained in the root tissue, most of the extra phosphorous taken up by the nitrogen-pretreated seedlings was translocated to the xylem. The enhanced translocation, however, did not totally account for the increase in uptake implying a specific stimulation of the uptake process.
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Claims 12
Claim · model-written summary
Ammonium increased phosphorus uptake after 6 to 8 hours.
- Treatment
- 1 millimolar ammoniume0
- Outcome
- phosphorous uptake ratee0
- Direction
- increasee0
- Value
- 6 to 8 hourse0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Transfer to complete solutions containing 1 millimolar ammonium resulted in an increase in phosphorous uptake rate after 6 to 8 hours”
t0“Zea mays L.”
Claim · model-written summary
The ammonium stimulus persisted for at least 5.5 hours after transfer to nitrogen-free solution.
- Treatment
- nitrogen-free solutionse0
- Outcome
- stimuluse0
- Direction
- remained effectivee0
- Value
- at least 5.5 hourse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The stimulus remained effective for at least 5.5 hours upon subsequent transfer to nitrogen-free solutions”
t0“Zea mays L.”
Claim · model-written summary
Nitrate pretreatment enhanced subsequent phosphorus uptake.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pretreatments for 16 hours with either nitrate or ammonium resulted in enhanced rates of subsequent phosphorous uptake and in enhanced translocation to the xylem of the exogenously supplied phosphorous”
t0“Zea mays L.”
Claim · model-written summary
Ammonium pretreatment enhanced subsequent phosphorus uptake.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pretreatments for 16 hours with either nitrate or ammonium resulted in enhanced rates of subsequent phosphorous uptake and in enhanced translocation to the xylem of the exogenously supplied phosphorous”
t0“Zea mays L.”
Claim · model-written summary
Nitrate pretreatment enhanced phosphorus translocation to xylem.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pretreatments for 16 hours with either nitrate or ammonium resulted in enhanced rates of subsequent phosphorous uptake and in enhanced translocation to the xylem of the exogenously supplied phosphorous”
t0“Zea mays L.”
Claim · model-written summary
Ammonium pretreatment enhanced phosphorus translocation to xylem.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pretreatments for 16 hours with either nitrate or ammonium resulted in enhanced rates of subsequent phosphorous uptake and in enhanced translocation to the xylem of the exogenously supplied phosphorous”
t0“Zea mays L.”
Claim · model-written summary
Both phosphorus uptake and translocation plateaued after 0.1 to 1.0 millimolar nitrogen pretreatment.
- Treatment
- 0.1 to 1.0 millimolar concentrations of either nitrogen ione0
- Outcome
- Both processese0
- Direction
- plateaue0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both processes reached a plateau following pretreatment with 0.1 to 1.0 millimolar concentrations of either nitrogen ion”
t0“Zea mays L.”
Claim · model-written summary
Ten millimolar nitrate further enhanced phosphorus processes.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Further enhancement occurred with 10 millimolar nitrate, but not with 10 millimolar ammonium pretreatment”
t0“Zea mays L.”
Claim · model-written summary
Ten millimolar ammonium did not further enhance phosphorus processes.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Further enhancement occurred with 10 millimolar nitrate, but not with 10 millimolar ammonium pretreatment”
t0“Zea mays L.”
Claim · model-written summary
Nitrogen pretreatment slightly increased exogenous phosphorus retained in roots.
- Treatment
- nitrogen pretreatmentse0
- Outcome
- quantity of exogenous phosphorous retained in the root tissuee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although nitrogen pretreatments slightly increased the quantity of exogenous phosphorous retained in the root tissue”
t0“Zea mays L.”
Claim · model-written summary
Most extra phosphorus taken up by nitrogen-pretreated seedlings was translocated to xylem.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“most of the extra phosphorous taken up by the nitrogen-pretreated seedlings was translocated to the xylem”
t0“Zea mays L.”
Claim · model-written summary
Enhanced translocation did not fully account for increased uptake.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The enhanced translocation, however, did not totally account for the increase in uptake implying a specific stimulation of the uptake process”
t0“Zea mays L.”
The same questions in other papers
nitrogen · nutrient: content · Zea mays (maize)Positive and negative results
402 papers in the same direction as this paper · 83 in the opposite direction · 3 reporting no difference from an alternative
- negative
- negative
- positive
485 papers more in this group
See all 489 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.