Abstract
Because the “mobilization” of nitrogen resulting from nutritional nitrogen deficiency is also prominent during leaf senescence, the characteristics of these two syndromes were compared. Oat plants ( Avena sativa L. cv. Victory) were raised on a nutrient solution, complete except for nitrogen supply (i.e., with only the seed protein as nitrogen source), and the senescence of their leaves was compared with that of controls grown on a full nutrient solution. The N‐deficient plants flowered after forming only 4 leaves and each set a single seed. The nitrogen lack affected the content of chlorophyll somewhat more than the content of the amino acids or protein nitrogen. However, spraying the plants with kinetin solution was able to retain 20–30% of the chlorophyll and protein. During senescence, the chlorophyll appears to be less stable in the N‐deficient leaves than in the controls, while the protein is somewhat more stable than in the controls. Also, when the detached leaves from N‐deficient plants senesced in white light or in darkness, kinetin delayed their senescence almost as effectively as that of control leaves. Most strikingly, the stomata of N‐deficient leaves after detachment and floating on water were largely closed in light, just as in senescence, but could be partially induced to open by kinetin treatment. Since stomatal closure has earlier been shown to cause senescence, the characteristic syndrome of foliar nitrogen deficiency is concluded to be partly that of senescence.
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Claims 9
Claim · model-written summary
Nitrogen-deficient oat plants flowered after forming only 4 leaves and each set a single seed
- Taxon
- Avena sativa L.
Avena sativae0 - Material
- Victorye0
- Treatment
- complete except for nitrogen supplye0
- Outcome
- flowerede2
- Value
- a single seede2
- Qualifier
- after forming only 4 leavese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oat plants ( Avena sativa L. cv. Victory) were raised on a nutrient solution, complete except for nitrogen supply”
e2“flowered after forming only 4 leaves and each set a single seed”
Claim · model-written summary
Nitrogen lack affected chlorophyll content somewhat more than amino acid or protein nitrogen content in oat
- Taxon
- Avena sativa L.Avena sativae0
- Material
- Victorye0
- Treatment
- nitrogen lacke3
- Outcome
- content of chlorophylle3
- Direction
- somewhat moree3
- Comparator
- content of the amino acids or protein nitrogene3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oat plants ( Avena sativa L. cv. Victory) were raised on a nutrient solution, complete except for nitrogen supply”
e3“The nitrogen lack affected the content of chlorophyll somewhat more than the content of the amino acids or protein nitrogen”
Claim · model-written summary
Spraying oat plants with kinetin retained 20–30% of chlorophyll and protein
- Taxon
- Avena sativa L.Avena sativae0
- Material
- Victorye0
- Treatment
- spraying the plants with kinetin solutione4
- Outcome
- chlorophyll and proteine4
- Direction
- retaine4
- Value
- 20–30%e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oat plants ( Avena sativa L. cv. Victory) were raised on a nutrient solution, complete except for nitrogen supply”
e4“spraying the plants with kinetin solution was able to retain 20–30% of the chlorophyll and protein”
Claim · model-written summary
Chlorophyll appears to be less stable in nitrogen-deficient oat leaves than in controls
- Taxon
- Avena sativa L.Avena sativae0
- Material
- Victorye0
- Treatment
- complete except for nitrogen supplye0
- Outcome
- chlorophylle5
- Direction
- less stablee5
- Comparator
- controlse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oat plants ( Avena sativa L. cv. Victory) were raised on a nutrient solution, complete except for nitrogen supply”
e1“controls grown on a full nutrient solution”
e5“the chlorophyll appears to be less stable”
Claim · model-written summary
Protein is somewhat more stable in nitrogen-deficient oat leaves than in controls during senescence
- Taxon
- Avena sativa L.Avena sativae0
- Material
- Victorye0
- Treatment
- complete except for nitrogen supplye0
- Outcome
- proteine6
- Direction
- somewhat more stablee6
- Comparator
- controlse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oat plants ( Avena sativa L. cv. Victory) were raised on a nutrient solution, complete except for nitrogen supply”
e6“while the protein is somewhat more stable than in the controls”
Claim · model-written summary
Kinetin delayed senescence of detached oat leaves almost as effectively as in control leaves
- Taxon
- Avena sativa L.Avena sativae0
- Treatment
- kinetine7
- Outcome
- senescencee7
- Direction
- delayede7
- Comparator
- control leavese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oat plants ( Avena sativa L. cv. Victory) were raised on a nutrient solution, complete except for nitrogen supply”
e7“kinetin delayed their senescence almost as effectively as that of control leaves”
Claim · model-written summary
Stomata of nitrogen-deficient detached oat leaves were largely closed in light, as in senescence
- Taxon
- Avena sativa L.Avena sativae0
- Outcome
- stomatae2
- Direction
- largely closede1
- Qualifier
- just as in senescencee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oat plants ( Avena sativa L. cv. Victory) were raised on a nutrient solution, complete except for nitrogen supply”
e1“were largely closed in light, just as in senescence”
e2“the stomata of”
Claim · model-written summary
Kinetin partially reopened the stomata of nitrogen-deficient detached oat leaves
- Taxon
- Avena sativa L.Avena sativae0
- Treatment
- kinetin treatmente1
- Outcome
- stomatae2
- Direction
- partially induced to opene1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oat plants ( Avena sativa L. cv. Victory) were raised on a nutrient solution, complete except for nitrogen supply”
e1“but could be partially induced to open by kinetin treatment”
e2“the stomata of”
Claim · model-written summary
The syndrome of foliar nitrogen deficiency is partly that of senescence in oat
- Taxon
- Avena sativa L.Avena sativae0
- Outcome
- syndrome of foliar nitrogen deficiencye1
- Qualifier
- partly that of senescencee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Oat plants ( Avena sativa L. cv. Victory) were raised on a nutrient solution, complete except for nitrogen supply”
e1“the characteristic syndrome of foliar nitrogen deficiency is concluded to be partly that of senescence”
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See all 6 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.