Abstract
1. Leaves were removed from different positions on the stem of Lizard's Tail and Little Turkish varieties of Nicotiona tabacum, and effects upon floral abscission were observed. In other experiments the flower was removed to determine its effect upon the abscission of the remaining pedicel. IAA in lanolin was added to the nodes where leaves had been excised and to the pedicel stubs to determine additional or altering effects. 2. The removal of upper leaves resulted in fewer days to abscission of unfertilized ovaries. The removal of lower leaves caused little variation in time of abscission. 3. The area of the leaves removed had little effect upon abscission; the nodal position of the leaves removed was more important. 4. The shorter abscission time following removal of upper leaves was altered by application of IAA in lanolin to the exposed nodes. This effect was proportional to the concentration applied. High concentrations (1000 and 10,000 p.p.m.) of IAA added at the nodes can retard abscission for a longer time than the upper leaves do normally. 5. Removal of the ovaries resulted in much more rapid abscission. This was altered by applications of IAA in lanolin. Again, the retarding effect of the applied IAA was proportional to the concentration applied. A given concentration was more effective in causing an inhibition of abscission when applied to the pedicel stubs than when applied at nodes. This may be explained on the basis of the basipetal transport of auxin or by its different effect upon the distribution of carbohydrates and nitrogenous compounds within the plant. 6. Applications of all except the lowest concentration of IAA retarded abscission whether applied to the exposed nodes or to the pedicel stubs. This indicates that auxin effects abscission by the total concentration present irrespective of the point of its origin. 7. Removal of leaves resulted in a decreased number of flowers reaching anthesis. Application of IAA to the exposed nodes did not overcome the effect, which indicates that there is another factor(s) present in leaves which controls the maturation of flowers.
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Claims 14
Claim · model-written summary
Removal of upper leaves resulted in fewer days to abscission of unfertilized ovaries.
- Taxon
- Nicotiana tabacum
Nicotiana tabacumt0 - Treatment
- removal of upper leavese1
- Outcome
- days to abscission of unfertilized ovariese1
- Direction
- fewere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Nicotiana tabacum”
e1“The removal of upper leaves resulted in fewer days to abscission of unfertilized ovaries”
Claim · model-written summary
Removal of lower leaves caused little variation in time of abscission.
- Taxon
- Nicotiana tabacumNicotiana tabacumt0
- Treatment
- removal of lower leavese2
- Outcome
- time of abscissione2
- Direction
- no_changeinferrede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Nicotiana tabacum”
e2“The removal of lower leaves caused little variation in time of abscission”
Claim · model-written summary
The area of the leaves removed had little effect on abscission.
- Taxon
- Nicotiana tabacumNicotiana tabacumt0
- Treatment
- area of the leaves removede3
- Outcome
- abscissione3
- Direction
- no_changeinferrede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Nicotiana tabacum”
e3“The area of the leaves removed had little effect upon abscission; the nodal position of the leaves removed was more important”
Claim · model-written summary
The nodal position of the leaves removed was more important for abscission than their area.
- Taxon
- Nicotiana tabacumNicotiana tabacumt0
- Treatment
- nodal position of the leaves removede3
- Outcome
- abscissione3
- Direction
- more importante3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Nicotiana tabacum”
e3“The area of the leaves removed had little effect upon abscission; the nodal position of the leaves removed was more important”
Claim · model-written summary
High concentrations (1000 and 10,000 p.p.m.) of IAA added at the nodes retarded abscission for a longer time than the upper leaves do normally.
- Taxon
- Nicotiana tabacumNicotiana tabacumt0
- Treatment
- IAAe5
- Outcome
- abscissione5
- Direction
- retarde5
- Value
- 1000 and 10,000 p.p.m.e5
- Qualifier
- for a longer timee5
- Comparator
- upper leavese5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Nicotiana tabacum”
e5“High concentrations (1000 and 10,000 p.p.m.) of IAA added at the nodes can retard abscission for a longer time than the upper leaves do normally”
Claim · model-written summary
The shortened abscission after upper-leaf removal was altered by IAA in lanolin, and the effect increased with IAA concentration.
- Taxon
- Nicotiana tabacumNicotiana tabacumt0
- Treatment
- application of IAA in lanoline4
- Outcome
- abscission timee4
- Direction
- increaseinferrede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Nicotiana tabacum”
e4“The shorter abscission time following removal of upper leaves was altered by application of IAA in lanolin to the exposed nodes. This effect was proportional to the concentration applied”
Claim · model-written summary
Removal of the ovaries resulted in much more rapid abscission.
- Taxon
- Nicotiana tabacumNicotiana tabacumt0
- Treatment
- Removal of the ovariese6
- Outcome
- abscissione6
- Direction
- more rapide6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Nicotiana tabacum”
e6“Removal of the ovaries resulted in much more rapid abscission”
Claim · model-written summary
After ovary removal, IAA in lanolin altered abscission and its retarding effect increased with concentration.
- Taxon
- Nicotiana tabacumNicotiana tabacumt0
- Treatment
- applications of IAA in lanoline7
- Outcome
- retarding effecte7
- Direction
- increaseinferrede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Nicotiana tabacum”
e7“This was altered by applications of IAA in lanolin. Again, the retarding effect of the applied IAA was proportional to the concentration applied”
Claim · model-written summary
A given IAA concentration was more effective at inhibiting abscission when applied to the pedicel stubs than when applied at nodes.
- Taxon
- Nicotiana tabacumNicotiana tabacumt0
- Treatment
- applied to the pedicel stubse1
- Outcome
- inhibition of abscissione1
- Direction
- more effectivee1
- Comparator
- when applied at nodese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Nicotiana tabacum”
e1“A given concentration was more effective in causing an inhibition of abscission when applied to the pedicel stubs than when applied at nodes”
Claim · model-written summary
Applications of all IAA concentrations except the lowest retarded abscission whether applied to the nodes or to the pedicel stubs.
- Taxon
- Nicotiana tabacumNicotiana tabacumt0
- Treatment
- Applications of all except the lowest concentration of IAAe1
- Outcome
- abscissione1
- Direction
- retardede1
- Qualifier
- whether applied to the exposed nodes or to the pedicel stubse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Nicotiana tabacum”
e1“Applications of all except the lowest concentration of IAA retarded abscission whether applied to the exposed nodes or to the pedicel stubs”
Claim · model-written summary
Auxin acts on abscission through the total concentration present, irrespective of the point of its origin.
- Taxon
- Nicotiana tabacumNicotiana tabacumt0
- Compound
- auxine1
- Outcome
- abscissione1
- Qualifier
- by the total concentration present irrespective of the point of its origine1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Nicotiana tabacum”
e1“This indicates that auxin effects abscission by the total concentration present irrespective of the point of its origin”
Claim · model-written summary
Removal of leaves resulted in a decreased number of flowers reaching anthesis.
- Taxon
- Nicotiana tabacumNicotiana tabacumt0
- Treatment
- Removal of leavese1
- Outcome
- number of flowers reaching anthesise1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Nicotiana tabacum”
e1“Removal of leaves resulted in a decreased number of flowers reaching anthesis”
Claim · model-written summary
Applying IAA to the exposed nodes did not overcome the decrease in flowers reaching anthesis caused by leaf removal.
- Taxon
- Nicotiana tabacumNicotiana tabacumt0
- Treatment
- Application of IAA to the exposed nodese2
- Outcome
- number of flowers reaching anthesise1
- Direction
- no_changeinferrede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Nicotiana tabacum”
e1“Removal of leaves resulted in a decreased number of flowers reaching anthesis”
e2“Application of IAA to the exposed nodes did not overcome the effect, which indicates that there is another factor(s) present in leaves which controls the maturation of flowers”
Claim · model-written summary
Another factor present in leaves appears to control the maturation of flowers.
- Taxon
- Nicotiana tabacumNicotiana tabacumt0
- Outcome
- maturation of flowerse1
- Qualifier
- another factor(s) present in leavese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Nicotiana tabacum”
e1“Application of IAA to the exposed nodes did not overcome the effect, which indicates that there is another factor(s) present in leaves which controls the maturation of flowers”
The same questions in other papers
indole-3-acetic acid · yield · Nicotiana tabacum (tobacco)Results differ
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
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.