Abstract
Of twenty common oligosaccharides, monosaccharides and sugar alcohols tested, raffinose was found to be the best substrate for growth and respiration of apple pollen tubes. While in a solution of sucrose growth is retarded after about six hours, accompanied by a decrease in respiration intensity, no such decrease was observed in pollen tubes cultivated in a solution of raffinose even after 10 to 20 hrs. of growth. Raffinose is inverted by pollen tubes much more slowly than sucrose which is taken as the cause of the long-term effect of raffinose. Pollen did not germinate at all in a solution of turanose. It thus appears to be probable that the primary factor in the specific effect of sucrose and raffinose on the growth of apple-tree pollen tubes is the presence of β-D-fructofuranose in the sugar molecule.
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Claims 8
Claim · model-written summary
Raffinose was the best tested substrate for apple pollen-tube growth and respiration.
- Taxon
- apple
Malus domesticae0 - Organ / stage
- pollen tubese0
- Treatment
- raffinosee0
- Outcome
- growth and respiratione0
- Direction
- beste0
- Comparator
- twenty common oligosaccharides, monosaccharides and sugar alcoholse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Of twenty common oligosaccharides, monosaccharides and sugar alcohols tested, raffinose was found to be the best substrate for growth and respiration of apple pollen tubes.”
Claim · model-written summary
Apple pollen-tube growth in sucrose was retarded after about six hours.
- Taxon
- apple-treeMalus domesticat0
- Treatment
- solution of sucrosee0
- Outcome
- growthe0
- Direction
- retardede0
- Qualifier
- after about six hourse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“While in a solution of sucrose growth is retarded after about six hours, accompanied by a decrease in respiration intensity”
t0“apple-tree pollen tubes”
Claim · model-written summary
Apple pollen-tube respiration intensity decreased in sucrose after about six hours.
- Taxon
- apple-treeMalus domesticat0
- Treatment
- solution of sucrosee0
- Outcome
- respiration intensitye0
- Direction
- decreasee0
- Qualifier
- after about six hourse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“While in a solution of sucrose growth is retarded after about six hours, accompanied by a decrease in respiration intensity”
t0“apple-tree pollen tubes”
Claim · model-written summary
No corresponding decrease occurred in apple pollen tubes in raffinose even after 10 to 20 hours.
- Taxon
- apple-treeMalus domesticat0
- Treatment
- solution of raffinosee0
- Outcome
- growthe0
- Direction
- no such decreasee0
- Qualifier
- even after 10 to 20 hrs. of growthe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no such decrease was observed in pollen tubes cultivated in a solution of raffinose even after 10 to 20 hrs. of growth.”
t0“apple-tree pollen tubes”
Claim · model-written summary
Apple pollen tubes inverted raffinose more slowly than sucrose.
- Taxon
- apple-treeMalus domesticat0
- Treatment
- Raffinosee0
- Outcome
- invertede0
- Direction
- much more slowlye0
- Comparator
- sucrosee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Raffinose is inverted by pollen tubes much more slowly than sucrose”
t0“apple-tree pollen tubes”
Claim · model-written summary
Slower inversion is proposed to cause raffinose's long-term effect on apple pollen tubes.
- Taxon
- apple-treeMalus domesticat0
- Outcome
- long-term effect of raffinosee0
- Qualifier
- inverted by pollen tubes much more slowly than sucrosee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Raffinose is inverted by pollen tubes much more slowly than sucrose which is taken as the cause of the long-term effect of raffinose.”
t0“apple-tree pollen tubes”
Claim · model-written summary
Apple pollen did not germinate in turanose solution.
- Taxon
- apple-treeMalus domesticat0
- Treatment
- solution of turanosee0
- Outcome
- did not germinate at alle0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pollen did not germinate at all in a solution of turanose.”
t0“apple-tree pollen tubes”
Claim · model-written summary
The authors propose β-D-fructofuranose as the primary factor in sucrose and raffinose effects on apple pollen-tube growth.
- Taxon
- apple-treeMalus domesticae0
- Compound
- β-D-fructofuranosee0
- Outcome
- growth of apple-tree pollen tubese0
- Qualifier
- appears to be probablee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It thus appears to be probable that the primary factor in the specific effect of sucrose and raffinose on the growth of apple-tree pollen tubes is the presence of β-D-fructofuranose in the sugar molecule.”
The same questions in other papers
sucrose · growth · Malus domestica (apple)Positive and negative results
3 papers in the same direction as this paper · 12 in the opposite direction
- positive
- positive
- positive
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.