Abstract
Ethylene inhibits hypocotyl elongation in etiolated Arabidopsis seedlings. However, when Arabidopsis was grown in the light in the presence of ethylene or its precursor 1-aminocyclopropane-1-carboxylic acid (ACC), a marked induction of hypocotyl elongation occurred. This resulted from an increase in cell expansion rather than cell division. The effects of ethylene and ACC were antagonized by the ethylene action inhibitor Ag+. The elongation response was absent or weakened in a set of ethylene-insensitive mutants (etr1-3, ein2-1, ein3-1, ein4, ain1-10, ein7). With the exception of ein4, the degree of inhibition of hypocotyl elongation was correlated with the strength of the ethylene-insensitive phenotype based on the triple response assay. In addition, the constitutive ethylene response mutant ctr1-1, grown in the light, had a longer hypocotyl than the wild type. Exogenous auxin also induced hypocotyl elongation in light-grown Arabidopsis. Again, the response was abolished by treatment with Ag+, suggesting that ethylene might be a mediator. The results showed that, depending on light conditions, ethylene can induce opposite effects on cell expansion in Arabidopsis hypocotyls.
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Claims 11
Claim · model-written summary
Ethylene inhibited hypocotyl elongation in etiolated seedlings.
- Taxon
- Arabidopsis
Arabidopsise0 - Organ / stage
- etiolated Arabidopsis seedlingse0
- Treatment
- Ethylenee0
- Outcome
- hypocotyl elongatione0
- Direction
- inhibitse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ethylene inhibits hypocotyl elongation in etiolated Arabidopsis seedlings.”
Claim · model-written summary
Ethylene induced hypocotyl elongation in light-grown Arabidopsis.
- Taxon
- ArabidopsisArabidopsise0
- Treatment
- ethylenee0
- Outcome
- hypocotyl elongatione0
- Direction
- inductione0
- Setting
- in the lighte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when Arabidopsis was grown in the light in the presence of ethylene or its precursor 1-aminocyclopropane-1-carboxylic acid (ACC), a marked induction of hypocotyl elongation occurred”
Claim · model-written summary
ACC induced hypocotyl elongation in light-grown Arabidopsis.
- Taxon
- ArabidopsisArabidopsise0
- Treatment
- 1-aminocyclopropane-1-carboxylic acid (ACC)e0
- Outcome
- hypocotyl elongatione0
- Direction
- inductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when Arabidopsis was grown in the light in the presence of ethylene or its precursor 1-aminocyclopropane-1-carboxylic acid (ACC), a marked induction of hypocotyl elongation occurred”
Claim · model-written summary
The elongation increase arose from cell expansion rather than division.
- Taxon
- ArabidopsisArabidopsist0
- Outcome
- cell expansione0
- Direction
- increasee0
- Qualifier
- rather than cell divisione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis”
e0“This resulted from an increase in cell expansion rather than cell division.”
Claim · model-written summary
Ag+ antagonized ethylene and ACC effects.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- Ag+e0
- Outcome
- effects of ethylene and ACCe0
- Direction
- antagonizede0
- Comparator
- ethylene and ACCe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis”
e0“The effects of ethylene and ACC were antagonized by the ethylene action inhibitor Ag+.”
Claim · model-written summary
Ethylene-insensitive mutants lacked or had weakened elongation responses.
- Taxon
- ArabidopsisArabidopsist0
- Material
- ethylene-insensitive mutantse0
- Outcome
- elongation responsee0
- Direction
- absent or weakenede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis”
e0“The elongation response was absent or weakened in a set of ethylene-insensitive mutants (etr1-3, ein2-1, ein3-1, ein4, ain1-10, ein7).”
Claim · model-written summary
Except for ein4, inhibition of hypocotyl elongation correlated with ethylene-insensitive phenotype strength.
- Taxon
- ArabidopsisArabidopsist0
- Material
- ein4e0
- Outcome
- degree of inhibition of hypocotyl elongatione0
- Qualifier
- strength of the ethylene-insensitive phenotypee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis”
e0“With the exception of ein4, the degree of inhibition of hypocotyl elongation was correlated with the strength of the ethylene-insensitive phenotype based on the triple response assay.”
Claim · model-written summary
Light-grown ctr1-1 had a longer hypocotyl than wild type.
- Taxon
- ArabidopsisArabidopsist0
- Material
- ctr1-1e0
- Outcome
- hypocotyle0
- Direction
- longere0
- Comparator
- wild typee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis”
e0“the constitutive ethylene response mutant ctr1-1, grown in the light, had a longer hypocotyl than the wild type”
Claim · model-written summary
Exogenous auxin induced hypocotyl elongation in light-grown Arabidopsis.
- Taxon
- ArabidopsisArabidopsise0
- Treatment
- Exogenous auxine0
- Outcome
- hypocotyl elongatione0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenous auxin also induced hypocotyl elongation in light-grown Arabidopsis.”
Claim · model-written summary
Ag+ abolished the auxin-induced elongation response.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- Ag+e0
- Outcome
- responsee0
- Direction
- abolishede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis”
e0“the response was abolished by treatment with Ag+”
Claim · model-written summary
Ethylene may mediate auxin-induced elongation.
- Taxon
- ArabidopsisArabidopsist0
- Outcome
- ethylene might be a mediatore0
- Qualifier
- might be a mediatore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis”
e0“suggesting that ethylene might be a mediator”
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See all 70 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.