Abstract
Gravitropic asymmetry of auxin was observed in hypocotyls of tomato (Lycopersicon esculentum Mill.) soon after horizontal placement: the ratio of apically supplied [3H]IAA collected from the lower sides to that from the upper sides was about 1.4 between 5 and 10 minutes. This was adequately early to account for the beginning of curvature. The auxin asymmetry ratio rose to about 2.5 between 20 and 25 minutes, and to 3.5 during the main phase of curvature. This compares reasonably well with the roughly 3.9 ratio for elongation on the lower side to elongation on the upper side that is the basis for the curvature. These data extend evidence that the Went-Cholodny theory for the mediation of tropisms is valid for dicot stems. Also consistent with the theory, an auxin asymmetry ratio of 2.5 was observed when wrong-way gravitropic curvature developed following application of a high level of auxin. In addition to reversing the asymmetry of elongation, the large supplement of auxin resulted in lower net elongation. Previous data established that ethylene is not involved in this decrease of growth as a function of increasing level of auxin.
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Claims 7
Claim · model-written summary
Lower-side to upper-side auxin ratio was about 1.4 after 5–10 minutes.
- Taxon
- tomato (Lycopersicon esculentum Mill.)
Solanum lycopersicumt0 - Outcome
- ratio of apically supplied [3H]IAA collected from the lower sides to that from the upper sidese0
- Value
- 1.4e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the ratio of apically supplied [3H]IAA collected from the lower sides to that from the upper sides was about 1.4 between 5 and 10 minutes”
t0“tomato (Lycopersicon esculentum Mill.)”
Claim · model-written summary
The auxin asymmetry ratio increased to about 2.5 after 20–25 minutes.
- Taxon
- tomato (Lycopersicon esculentum Mill.)Solanum lycopersicumt0
- Outcome
- auxin asymmetry ratioe0
- Direction
- rosee0
- Value
- 2.5e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The auxin asymmetry ratio rose to about 2.5 between 20 and 25 minutes”
t0“tomato (Lycopersicon esculentum Mill.)”
Claim · model-written summary
The auxin asymmetry ratio reached 3.5 during main curvature.
- Taxon
- tomato (Lycopersicon esculentum Mill.)Solanum lycopersicumt0
- Outcome
- curvaturee0
- Value
- 3.5e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and to 3.5 during the main phase of curvature”
t0“tomato (Lycopersicon esculentum Mill.)”
Claim · model-written summary
The lower-to-upper side elongation ratio was about 3.9.
- Taxon
- tomato (Lycopersicon esculentum Mill.)Solanum lycopersicumt0
- Outcome
- ratio for elongation on the lower side to elongation on the upper sidee0
- Value
- 3.9e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“roughly 3.9 ratio for elongation on the lower side to elongation on the upper side”
t0“tomato (Lycopersicon esculentum Mill.)”
Claim · model-written summary
An auxin asymmetry ratio of 2.5 accompanied wrong-way curvature after high auxin application.
- Taxon
- tomato (Lycopersicon esculentum Mill.)Solanum lycopersicumt0
- Treatment
- application of a high level of auxine0
- Outcome
- auxin asymmetry ratioe0
- Value
- 2.5e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an auxin asymmetry ratio of 2.5 was observed when wrong-way gravitropic curvature developed following application of a high level of auxin”
t0“tomato (Lycopersicon esculentum Mill.)”
Claim · model-written summary
High auxin reversed elongation asymmetry and reduced net elongation.
- Taxon
- tomato (Lycopersicon esculentum Mill.)Solanum lycopersicumt0
- Treatment
- large supplement of auxine0
- Outcome
- net elongatione0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the large supplement of auxin resulted in lower net elongation”
t0“tomato (Lycopersicon esculentum Mill.)”
Claim · model-written summary
Auxin asymmetry was judged sufficient to account for the start of curvature.
- Taxon
- tomato (Lycopersicon esculentum Mill.)Solanum lycopersicumt0
- Outcome
- beginning of curvaturee0
- Qualifier
- adequately earlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This was adequately early to account for the beginning of curvature”
t0“tomato (Lycopersicon esculentum Mill.)”
The same questions in other papers
class · growth · Solanum lycopersicum (tomato)Positive and negative results
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See all 53 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.