Abstract
An old maize (Zea mays L.) hybrid (Pride 5) has been shown to be less tolerant to N stress than a new maize hybrid (Pioneer 3902) during early phases of development. The objective of this study was to quantify the response of the two hybids to N supply in terms of N uptake, N partitioning, and photosynthetic N–use efficiency. Plants were grown under controlled-environment conditions until the 12-leaf stage at three levels of N supply (i.e., 15 mM N, 2.5 mM N, and 0.5 mM N) and were sampled at the 4-, 8-, and 12-leaf stages. Rates of N uptake per unit ground area were higher for Pioneer 3902 than for Pride 5 under maximum N stress during the 8- to 12-leaf phase, but rates were higher for Pride 5 at high N. Rates of N uptake per unit root weight were higher for Pioneer 3902 than for Pride 5 under both medium and low N supply. The old hybrid (Pride 5) partitioned more dry matter and N to leaves than the new hybrid under low N supply, but leaf N per unit leaf area was higher for the new hybrid. The new hybrid (Pioneer 3902) maintained greater rates of leaf photosynthesis per unit leaf N regardless of N supply. Consequently, results indicate that the higher N-use efficiency of Pioneer 3902 under low N supply is associated with higher N uptake and a higher leaf N per unit leaf area. Key words:Zea mays L., dry matter accumulation, photosynthesis, leaf N
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Claims 8
Claim · model-written summary
Under maximum N stress in the 8- to 12-leaf phase, Pioneer 3902 had higher N uptake per unit ground area than Pride 5.
- Material
- Pioneer 3902e1
- Organ / stage
- 8- to 12-leaf phasee1
- Treatment
- maximum N stresse1
- Outcome
- N uptake per unit ground areae1
- Direction
- highere1
- Comparator
- Pride 5e1
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An old maize (Zea mays L.) hybrid (Pride 5)”
e1“Rates of N uptake per unit ground area were higher for Pioneer 3902 than for Pride 5 under maximum N stress during the 8- to 12-leaf phase”
Claim · model-written summary
At high N, Pride 5 had higher N uptake per unit ground area than Pioneer 3902.
- Material
- Pride 5e1
- Treatment
- high Ne1
- Outcome
- N uptake per unit ground areae1
- Direction
- highere1
- Comparator
- Pioneer 3902e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An old maize (Zea mays L.) hybrid (Pride 5)”
e1“Rates of N uptake per unit ground area were higher for Pioneer 3902 than for Pride 5 under maximum N stress during the 8- to 12-leaf phase, but rates were higher for Pride 5 at high N”
Claim · model-written summary
Pioneer 3902 had higher N uptake per unit root weight than Pride 5 under medium and low N supply.
- Material
- Pioneer 3902e1
- Treatment
- medium and low N supplye1
- Outcome
- N uptake per unit root weighte1
- Direction
- highere1
- Comparator
- Pride 5e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An old maize (Zea mays L.) hybrid (Pride 5)”
e1“Rates of N uptake per unit root weight were higher for Pioneer 3902 than for Pride 5 under both medium and low N supply”
Claim · model-written summary
Under low N supply, the old hybrid Pride 5 partitioned more dry matter and N to leaves than the new hybrid.
- Material
- Pride 5e1
- Treatment
- low N supplye1
- Outcome
- dry matter and N to leavese1
- Direction
- moree1
- Comparator
- new hybride1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An old maize (Zea mays L.) hybrid (Pride 5)”
e1“The old hybrid (Pride 5) partitioned more dry matter and N to leaves than the new hybrid under low N supply”
Claim · model-written summary
Leaf N per unit leaf area was higher in the new hybrid than in the old hybrid.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An old maize (Zea mays L.) hybrid (Pride 5)”
e1“leaf N per unit leaf area was higher for the new hybrid”
Claim · model-written summary
The new hybrid Pioneer 3902 maintained greater rates of leaf photosynthesis per unit leaf N regardless of N supply.
- Material
- Pioneer 3902e1
- Outcome
- rates of leaf photosynthesis per unit leaf Ne1
- Direction
- greatere1
- Qualifier
- regardless of N supplye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An old maize (Zea mays L.) hybrid (Pride 5)”
e1“The new hybrid (Pioneer 3902) maintained greater rates of leaf photosynthesis per unit leaf N regardless of N supply”
Claim · model-written summary
Higher N-use efficiency of Pioneer 3902 under low N supply is associated with higher N uptake.
- Material
- Pioneer 3902e1
- Treatment
- low N supplye1
- Outcome
- N-use efficiencye1
- Direction
- highere1
- Qualifier
- associated with higher N uptakee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An old maize (Zea mays L.) hybrid (Pride 5)”
e1“the higher N-use efficiency of Pioneer 3902 under low N supply is associated with higher N uptake and a higher leaf N per unit leaf area”
Claim · model-written summary
Higher N-use efficiency of Pioneer 3902 under low N supply is associated with a higher leaf N per unit leaf area.
- Material
- Pioneer 3902e1
- Treatment
- low N supplye1
- Outcome
- N-use efficiencye1
- Direction
- highere1
- Qualifier
- a higher leaf N per unit leaf areae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An old maize (Zea mays L.) hybrid (Pride 5)”
e1“the higher N-use efficiency of Pioneer 3902 under low N supply is associated with higher N uptake and a higher leaf N per unit leaf area”
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See all 748 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.