Abstract
The effects of phosphorus (P) deprivation on the changes in the contents of reduced nitrogen (N) and P in the shoots of young maize plants (Zea mays L.) were investigated for up to 30 days after planting (DAP). P deprivation decreased the fresh weight and the contents of Chl, total P, esterified P, acid-soluble Pi, total reduced N, soluble protein N, and insoluble protein N in the entire shoot. Thirty DAP, in the fifth leaf blade, which was expanding, P deprivation greatly decreased the concentration of acid-soluble Pi but had a smaller effect on the concentration of esterified P and little or no effect on the concentrations of Chl, total reduced N, soluble protein N, and insoluble protein N. By contrast, in the fully expanded second leaf blade, P deprivation greatly decreased the contents of acid-soluble Pi, esterified P, Chl, total reduced N, soluble protein N, and insoluble protein N at 30 DAP. It is concluded that P deprivation induced the early initiation and accelerated remobilization of N from old leaf blades. Since this phenomenon is a critical feature of leaf senescence, it is suggested that the P status of leaves is involved in the regulation of leaf senescence in maize.
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Claims 10
Claim · model-written summary
Phosphorus deprivation decreased maize shoot fresh weight.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P deprivation decreased the fresh weight and the contents of Chl, total P, esterified P, acid-soluble Pi, total reduced N, soluble protein N, and insoluble protein N in the entire shoot.”
e1“young maize plants (Zea mays L.)”
Claim · model-written summary
Phosphorus deprivation decreased chlorophyll and phosphorus fractions throughout the maize shoot.
- Organ / stage
- entire shoote0
- Treatment
- P deprivatione0
- Outcome
- contents of Chl, total P, esterified P, acid-soluble Pie0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P deprivation decreased the fresh weight and the contents of Chl, total P, esterified P, acid-soluble Pi, total reduced N, soluble protein N, and insoluble protein N in the entire shoot.”
e1“young maize plants (Zea mays L.)”
Claim · model-written summary
Phosphorus deprivation decreased total reduced and soluble and insoluble protein nitrogen in the maize shoot.
- Organ / stage
- entire shoote0
- Treatment
- P deprivatione0
- Outcome
- total reduced N, soluble protein N, and insoluble protein Ne0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P deprivation decreased the fresh weight and the contents of Chl, total P, esterified P, acid-soluble Pi, total reduced N, soluble protein N, and insoluble protein N in the entire shoot.”
e1“young maize plants (Zea mays L.)”
Claim · model-written summary
At 30 DAP, phosphorus deprivation greatly decreased acid-soluble Pi in the expanding fifth maize leaf blade.
- Organ / stage
- fifth leaf bladee0
- Treatment
- P deprivatione0
- Outcome
- concentration of acid-soluble Pie0
- Direction
- decreasede0
- Qualifier
- Thirty DAPe0
Not reportedTaxonComparator
Verbatim
e0“Thirty DAP, in the fifth leaf blade, which was expanding, P deprivation greatly decreased the concentration of acid-soluble Pi”
Claim · model-written summary
At 30 DAP, phosphorus deprivation had a smaller effect on esterified P in the expanding fifth leaf blade.
- Organ / stage
- fifth leaf bladee0
- Treatment
- P deprivatione0
- Outcome
- concentration of esterified Pe0
- Qualifier
- smaller effecte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thirty DAP, in the fifth leaf blade, which was expanding, P deprivation greatly decreased the concentration of acid-soluble Pi but had a smaller effect on the concentration of esterified P”
e1“young maize plants (Zea mays L.)”
Claim · model-written summary
At 30 DAP, phosphorus deprivation had little or no effect on chlorophyll and nitrogen fractions in the fifth leaf blade.
- Organ / stage
- fifth leaf bladee1
- Treatment
- P deprivatione1
- Outcome
- concentrations of Chl, total reduced N, soluble protein N, and insoluble protein Ne0
- Direction
- little or no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“little or no effect on the concentrations of Chl, total reduced N, soluble protein N, and insoluble protein N.”
e1“Thirty DAP, in the fifth leaf blade, which was expanding, P deprivation”
e2“young maize plants (Zea mays L.)”
Claim · model-written summary
At 30 DAP, phosphorus deprivation greatly decreased Pi, esterified P and chlorophyll in the second leaf blade.
- Organ / stage
- second leaf bladee0
- Treatment
- P deprivatione0
- Outcome
- contents of acid-soluble Pi, esterified P, Chle0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the fully expanded second leaf blade, P deprivation greatly decreased the contents of acid-soluble Pi, esterified P, Chl, total reduced N, soluble protein N, and insoluble protein N at 30 DAP.”
e1“young maize plants (Zea mays L.)”
Claim · model-written summary
At 30 DAP, phosphorus deprivation greatly decreased nitrogen fractions in the second leaf blade.
- Organ / stage
- second leaf bladee0
- Treatment
- P deprivatione0
- Outcome
- total reduced N, soluble protein N, and insoluble protein Ne0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the fully expanded second leaf blade, P deprivation greatly decreased the contents of acid-soluble Pi, esterified P, Chl, total reduced N, soluble protein N, and insoluble protein N at 30 DAP.”
e1“young maize plants (Zea mays L.)”
Claim · model-written summary
Phosphorus deprivation initiated and accelerated nitrogen remobilization from older maize leaf blades.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P deprivation induced the early initiation and accelerated remobilization of N from old leaf blades.”
e1“young maize plants (Zea mays L.)”
Claim · model-written summary
The authors suggested leaf phosphorus status regulates maize leaf senescence.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the P status of leaves is involved in the regulation of leaf senescence in maize.”
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