Abstract
Abstract Some mineral deficiency symptoms and those of the leaf roll virus have frequently been confused. The similarity between mineral deficiencies and leaf roll symptoms suggests that the effect of the virus might be influenced by the nutrition of its host. A study of certain mineral relationships between healthy and diseased leaf roll plants in the Chippewa variety was therefore undertaken. In greenhouse and field experiments it was found that phosphorus deficiency produced symptoms ranging from slight to severe rolling of the leaves and from light to heavy pigment formation as the amount of phosphorus decreased. Symptoms of extreme phosphorus deficiency in non‐virus plants were similar to those produced by the virus except that more pigmentation occurred in the phosphorus deficiency symptoms. Severe nitrogen and slight phosphorus deficiencies caused only a moderate increase in the intensity of leaf roll symptoms while calcium, potassium, magnesium and sulfur had little or no effect. Leaf roll symptoms tended to be masked with adequate balanced nutrition. Analyses of leaf tissues taken from plants grown in the greenhouse and field showed in general that phosphorus, calcium, and magnesium contents were appreciably reduced in plants having leaf roll. The nitrogen and potassium contents apparently were not influenced by the virus. Dry weights of diseased plants were generally less than those of non‐virus plants. The results indicate that this might have been caused by the virus interfering with the uptake of phosphorus, calcium, and magnesium.
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Claims 10
Claim · model-written summary
Phosphorus deficiency increased leaf rolling and pigment formation as phosphorus declined.
- Taxon
- Potato
Solanum tuberosumt0 - Treatment
- phosphorus deficiencye0
- Outcome
- rolling of the leaves and from light to heavy pigment formatione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potato”
e0“phosphorus deficiency produced symptoms ranging from slight to severe rolling of the leaves and from light to heavy pigment formation as the amount of phosphorus decreased”
Claim · model-written summary
Extreme phosphorus deficiency resembled virus symptoms but caused more pigmentation.
- Taxon
- PotatoSolanum tuberosumt0
- Outcome
- more pigmentatione0
- Direction
- moree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potato”
e0“Symptoms of extreme phosphorus deficiency in non‐virus plants were similar to those produced by the virus except that more pigmentation occurred in the phosphorus deficiency symptoms”
Claim · model-written summary
Severe nitrogen deficiency moderately increased leaf roll symptom intensity.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- Severe nitrogene0
- Interactor
- leaf rolle0pathogen
- Outcome
- intensity of leaf roll symptomse0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potato”
e0“Severe nitrogen and slight phosphorus deficiencies caused only a moderate increase in the intensity of leaf roll symptoms”
Claim · model-written summary
Slight phosphorus deficiency moderately increased leaf roll symptom intensity.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- slight phosphorus deficienciese0
- Outcome
- intensity of leaf roll symptomse0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potato”
e0“Severe nitrogen and slight phosphorus deficiencies caused only a moderate increase in the intensity of leaf roll symptoms”
Claim · model-written summary
Calcium, potassium, magnesium and sulfur had little or no effect on leaf roll symptom intensity.
- Taxon
- PotatoSolanum tuberosumt0
- Outcome
- little or no effecte0
- Direction
- little or no effecte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potato”
e0“calcium, potassium, magnesium and sulfur had little or no effect”
Claim · model-written summary
Adequate balanced nutrition tended to mask leaf roll symptoms.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- adequate balanced nutritione0
- Outcome
- Leaf roll symptomse0
- Direction
- maskede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potato”
e0“Leaf roll symptoms tended to be masked with adequate balanced nutrition”
Claim · model-written summary
Phosphorus, calcium and magnesium contents were reduced in plants with leaf roll.
- Taxon
- PotatoSolanum tuberosumt0
- Outcome
- phosphorus, calcium, and magnesium contentse0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potato”
e0“phosphorus, calcium, and magnesium contents were appreciably reduced in plants having leaf roll”
Claim · model-written summary
Nitrogen and potassium contents apparently were unaffected by the virus.
- Taxon
- PotatoSolanum tuberosumt0
- Outcome
- nitrogen and potassium contentse0
- Direction
- not influencede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potato”
e0“The nitrogen and potassium contents apparently were not influenced by the virus”
Claim · model-written summary
Diseased plants generally had lower dry weight than non-virus plants.
- Taxon
- PotatoSolanum tuberosumt0
- Outcome
- Dry weightse0
- Direction
- lesse0
- Comparator
- non‐virus plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potato”
e0“Dry weights of diseased plants were generally less than those of non‐virus plants”
Claim · model-written summary
The virus may interfere with phosphorus, calcium and magnesium uptake.
- Taxon
- PotatoSolanum tuberosumt0
- Outcome
- uptake of phosphorus, calcium, and magnesiume0
- Qualifier
- virus interferinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Potato”
e0“this might have been caused by the virus interfering with the uptake of phosphorus, calcium, and magnesium”
The same questions in other papers
phosphorus · physiology: pigments · Solanum tuberosum (potato)Positive and negative results
1 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- no effect
phosphorus · disease · Solanum tuberosum (potato)Positive and negative results
3 papers in the same direction as this paper · 3 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- no effect
- negative
- negative
3 papers more in this group
See all 7 papers →nitrogen · disease · Solanum tuberosum (potato)Positive and negative results
11 papers in the same direction as this paper · 4 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
- negative
- negative
12 papers more in this group
See all 16 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.