Abstract
Cytokinins have profound effects on seedling development in Arabidopsis thaliana. Benzyladenine (BA) inhibits root elongation in light- or dark-grown seedlings, and in dark-grown seedlings BA inhibits hypocotyl elongation and exaggerates the curvature of apical hooks. The latter are characteristic ethylene responses and, therefore, the possible involvement of ethylene in BA responses was examined in seedlings. It was found that the inhibitory effects of BA on root and hypocotyl elongation were partially blocked by the action of ethylene inhibitors or ethylene-resistant mutations (ein1-1 and ein2-1). Ethylene production was stimulated by submicromolar concentrations of BA and could account, in part, for the inhibition of root and hypocotyl elongation. It was demonstrated further that BA did not affect the sensitivity of seedlings to ethylene. Thus, the effect of cytokinin on root and hypocotyl elongation in Arabidopsis appears to be mediated largely by the production of ethylene. The coupling between cytokinin and ethylene responses is further supported by the discovery that the cytokinin-resistant mutant ckr1 is resistant to ethylene and is allelic to the ethylene-resistant mutant ein2.
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Claims 9
Claim · model-written summary
Benzyladenine inhibited root elongation in light- and dark-grown seedlings.
- Taxon
- Arabidopsis thaliana
Arabidopsis thalianat0 - Treatment
- Benzyladenine (BA)e0
- Outcome
- root elongatione0
- Direction
- inhibitse0
- Qualifier
- light- or dark-grown seedlingse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Benzyladenine (BA) inhibits root elongation in light- or dark-grown seedlings”
t0“Arabidopsis thaliana Seedlings”
Claim · model-written summary
Benzyladenine inhibited hypocotyl elongation in dark-grown seedlings.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- BAe0
- Outcome
- hypocotyl elongatione0
- Direction
- inhibitse0
- Qualifier
- dark-grown seedlingse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in dark-grown seedlings BA inhibits hypocotyl elongation”
t0“Arabidopsis thaliana Seedlings”
Claim · model-written summary
Benzyladenine exaggerated apical hook curvature in dark-grown seedlings.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- BAe0
- Outcome
- curvature of apical hookse0
- Direction
- exaggeratese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in dark-grown seedlings BA inhibits hypocotyl elongation and exaggerates the curvature of apical hooks”
t0“Arabidopsis thaliana Seedlings”
Claim · model-written summary
Ethylene inhibitors or ethylene-resistant mutations partially blocked BA inhibition of root and hypocotyl elongation.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- ethylene inhibitors or ethylene-resistant mutations (ein1-1 and ein2-1)e0
- Outcome
- inhibitory effects of BA on root and hypocotyl elongatione0
- Direction
- partially blockede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the inhibitory effects of BA on root and hypocotyl elongation were partially blocked by the action of ethylene inhibitors or ethylene-resistant mutations (ein1-1 and ein2-1)”
t0“Arabidopsis thaliana Seedlings”
Claim · model-written summary
Submicromolar BA stimulated ethylene production.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- submicromolar concentrations of BAe0
- Outcome
- Ethylene productione0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ethylene production was stimulated by submicromolar concentrations of BA”
t0“Arabidopsis thaliana Seedlings”
Claim · model-written summary
BA did not affect seedling sensitivity to ethylene.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- BAe0
- Outcome
- sensitivity of seedlings to ethylenee0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BA did not affect the sensitivity of seedlings to ethylene”
t0“Arabidopsis thaliana Seedlings”
Claim · model-written summary
The cytokinin-resistant ckr1 mutant was resistant to ethylene.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Material
- cytokinin-resistant mutant ckr1e0
- Outcome
- resistant to ethylenee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the cytokinin-resistant mutant ckr1 is resistant to ethylene”
t0“Arabidopsis thaliana Seedlings”
Claim · model-written summary
The ckr1 mutant was allelic to ein2.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Gene
- ckr1e0
- Outcome
- allelic to the ethylene-resistant mutant ein2e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the cytokinin-resistant mutant ckr1 is resistant to ethylene and is allelic to the ethylene-resistant mutant ein2”
t0“Arabidopsis thaliana Seedlings”
Claim · model-written summary
The authors infer that cytokinin inhibition of root and hypocotyl elongation is mediated largely by ethylene production.
- Taxon
- ArabidopsisArabidopsise0
- Outcome
- effect of cytokinin on root and hypocotyl elongatione0
- Qualifier
- mediated largely by the production of ethylenee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of cytokinin on root and hypocotyl elongation in Arabidopsis appears to be mediated largely by the production of ethylene”
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