Abstract
The effects of ethylene and of indole-3-acetic acid (IAA) on growth of excised pea root sections have been compared under a variety of conditions. After 16 hours treatment the inhibitory action of IAA is fully reversible on transfer of the root sections to IAA-free solutions. In contrast, inhibition by ethylene is almost totally irreversible. IAA inhibits growth from zero time; ethylene is generally without effect during the first 3 to 6 hours. The inhibitory action of ethylene is dependent on factors such as tissue age and solution composition which have no major effect on IAA inhibition. Ethylene production is enhanced by 100 mum IAA, but conditions which reduce the rate of ethylene evolution 2 to 3-fold at the same IAA concentration fail to affect the inhibitory action of IAA on elongation. It seems unlikely that ethylene can play more than a minor role in mediating inhibition of pea root growth by IAA.
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Claims 9
Claim · model-written summary
IAA growth inhibition was fully reversible after 16 hours when roots were moved to IAA-free solution.
- Taxon
- pea
Lathyrus oleraceust0 - Organ / stage
- root sectionse0
- Treatment
- IAAe0
- Outcome
- inhibitory actione0
- Direction
- fully reversiblee0
- Value
- 16 hourse0
- Comparator
- IAA-free solutionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 16 hours treatment the inhibitory action of IAA is fully reversible on transfer of the root sections to IAA-free solutions”
t0“pea root sections”
Claim · model-written summary
Ethylene inhibition was almost totally irreversible.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- ethylenee0
- Outcome
- inhibitione0
- Direction
- almost totally irreversiblee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inhibition by ethylene is almost totally irreversible”
t0“pea root sections”
Claim · model-written summary
IAA inhibited growth from the start of treatment.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- IAAe0
- Outcome
- growthe0
- Direction
- inhibitse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“IAA inhibits growth from zero time”
t0“pea root sections”
Claim · model-written summary
Ethylene generally did not affect growth for the first 3 to 6 hours.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- ethylenee0
- Outcome
- effecte0
- Direction
- without effecte0
- Value
- 3 to 6 hourse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ethylene is generally without effect during the first 3 to 6 hours”
t0“pea root sections”
Claim · model-written summary
Ethylene inhibition depended on tissue age and solution composition.
- Taxon
- peaLathyrus oleraceust0
- Organ / stage
- tissuee0
- Treatment
- ethylenee0
- Outcome
- inhibitory action of ethylenee0
- Qualifier
- tissue age and solution compositione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The inhibitory action of ethylene is dependent on factors such as tissue age and solution composition”
t0“pea root sections”
Claim · model-written summary
Tissue age and solution composition had no major effect on IAA inhibition.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- IAAe0
- Outcome
- IAA inhibitione0
- Direction
- no major effecte0
- Qualifier
- tissue age and solution compositione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tissue age and solution composition which have no major effect on IAA inhibition”
t0“pea root sections”
Claim · model-written summary
100 mum IAA enhanced ethylene production.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- 100 mum IAAe0
- Outcome
- Ethylene productione0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ethylene production is enhanced by 100 mum IAA”
t0“pea root sections”
Claim · model-written summary
A two- to threefold reduction in ethylene evolution did not alter IAA inhibition of elongation.
- Taxon
- peaLathyrus oleraceust0
- Treatment
- IAAe0
- Outcome
- inhibitory action of IAA on elongatione0
- Direction
- fail to affecte0
- Value
- 2 to 3-folde0
- Qualifier
- conditions which reduce the rate of ethylene evolutione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“conditions which reduce the rate of ethylene evolution 2 to 3-fold at the same IAA concentration fail to affect the inhibitory action of IAA on elongation”
t0“pea root sections”
Claim · model-written summary
The authors infer that ethylene has at most a minor mediating role in IAA inhibition of root growth.
- Taxon
- peaLathyrus oleraceuse0
- Treatment
- IAAe0
- Compound
- ethylenee0
- Outcome
- inhibition of pea root growthe0
- Qualifier
- more than a minor rolee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It seems unlikely that ethylene can play more than a minor role in mediating inhibition of pea root growth by IAA”
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See all 6 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.