Abstract
Abstract A shoot-tip necrosis in actively-growing shoot cultures of various species has been observed. Using 3 cultivars of Solatium tuberosum grown on media differing in Ca concentration (0.3, 3.0, and 30 m m Ca), typical necrosis was induced or suppressed. Potatoes at 0.3 m m contained about 0.1% Ca g 1 dry weight of shoot and also showed the highest incidence of shoot-tip necrosis, ranging from 48% to 72%, depending on the cultivar. Potatoes grown at 3 or 30 m m Ca contained 0.5% or 3% Ca g −1 dry weight of shoot, respectively, and showed only 0% to 9% necrotic shoots, depending on cultivar. In addition to medium Ca content, Parafilm used as the vessel closure promoted shoot-tip necrosis, but increased levels of Ca in the medium tended to overcome the effect. Although cultivar differences in tissue content of other minerals were apparent, these were not associated with the shoot-tip necrosis problem. We conclude that shoot-tip necrosis is associated with a Ca deficiency in actively-growing shoot cultures.
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Claims 8
Claim · model-written summary
At 0.3 m m Ca, potato shoots had about 0.1% Ca and 48% to 72% shoot-tip necrosis.
- Taxon
- Potatoes
Solanum tuberosume0 - Treatment
- 0.3 m me0
- Outcome
- incidence of shoot-tip necrosise0
- Direction
- higheste0
- Value
- 48% to 72%e0
- Qualifier
- depending on the cultivare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potatoes at 0.3 m m contained about 0.1% Ca g 1 dry weight of shoot and also showed the highest incidence of shoot-tip necrosis, ranging from 48% to 72%, depending on the cultivar.”
Claim · model-written summary
At 3 m m Ca, potato shoots had 0.5% Ca by dry weight.
- Taxon
- PotatoesSolanum tuberosume0
- Treatment
- 3e0
- Outcome
- Ca g −1 dry weight of shoote0
- Value
- 0.5%e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potatoes grown at 3 or 30 m m Ca contained 0.5% or 3% Ca g −1 dry weight of shoot, respectively, and showed only 0% to 9% necrotic shoots, depending on cultivar.”
Claim · model-written summary
At 30 m m Ca, potato shoots had 3% Ca by dry weight.
- Taxon
- PotatoesSolanum tuberosume0
- Treatment
- 30 m m Cae0
- Outcome
- Ca g −1 dry weight of shoote0
- Value
- 3%e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potatoes grown at 3 or 30 m m Ca contained 0.5% or 3% Ca g −1 dry weight of shoot, respectively, and showed only 0% to 9% necrotic shoots, depending on cultivar.”
Claim · model-written summary
At 3 or 30 m m Ca, only 0% to 9% of shoots were necrotic.
- Taxon
- PotatoesSolanum tuberosume0
- Treatment
- 3 or 30 m m Cae0
- Outcome
- necrotic shootse0
- Direction
- onlye0
- Value
- 0% to 9%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potatoes grown at 3 or 30 m m Ca contained 0.5% or 3% Ca g −1 dry weight of shoot, respectively, and showed only 0% to 9% necrotic shoots, depending on cultivar.”
Claim · model-written summary
Parafilm vessel closure promoted shoot-tip necrosis.
- Taxon
- PotatoesSolanum tuberosume1
- Treatment
- Parafilm used as the vessel closuree0
- Outcome
- shoot-tip necrosise0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parafilm used as the vessel closure promoted shoot-tip necrosis, but increased levels of Ca in the medium tended to overcome the effect.”
e1“Potatoes at 0.3 m m contained about 0.1% Ca g 1 dry weight of shoot”
Claim · model-written summary
Higher medium calcium tended to overcome the Parafilm effect on shoot-tip necrosis.
- Taxon
- PotatoesSolanum tuberosume1
- Treatment
- increased levels of Ca in the mediume0
- Outcome
- shoot-tip necrosise0
- Direction
- overcomee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parafilm used as the vessel closure promoted shoot-tip necrosis, but increased levels of Ca in the medium tended to overcome the effect.”
e1“Potatoes at 0.3 m m contained about 0.1% Ca g 1 dry weight of shoot”
Claim · model-written summary
Cultivar differences in other tissue minerals were not associated with shoot-tip necrosis.
- Taxon
- PotatoesSolanum tuberosume1
- Material
- cultivare0
- Outcome
- shoot-tip necrosis probleme0
- Direction
- not associatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although cultivar differences in tissue content of other minerals were apparent, these were not associated with the shoot-tip necrosis problem.”
e1“Potatoes at 0.3 m m contained about 0.1% Ca g 1 dry weight of shoot”
Claim · model-written summary
The authors conclude shoot-tip necrosis is associated with calcium deficiency in growing shoot cultures.
- Taxon
- PotatoesSolanum tuberosume1
- Organ / stage
- actively-growing shoot culturese0
- Treatment
- Ca deficiencye0
- Outcome
- shoot-tip necrosise0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We conclude that shoot-tip necrosis is associated with a Ca deficiency in actively-growing shoot cultures.”
e1“Potatoes at 0.3 m m contained about 0.1% Ca g 1 dry weight of shoot”
The same questions in other papers
calcium atom · disease · Solanum tuberosum (potato)Positive and negative results
7 papers in the same direction as this paper · 2 in the opposite direction
- negative
- no effect
- positive
6 papers more in this group
See all 10 papers →in vitro · disease · Solanum tuberosum (potato)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
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.