Abstract
PREMISE OF THE STUDY: To reach favorable conditions for photosynthesis, seedlings grow upward when deprived of light upon underground germination. To direct their growth, they use their negative gravitropic capacity. Negative gravitropism is under tight control of multiple hormones. METHODS: By counting the number of standing plants in a population or by real time monitoring of the reorientation of gravistimulated seedlings of Arabidopsis thaliana, we evaluated the negative gravitropism of ethylene or brassinosteroid (BR) treated plants. Meta-analysis of transcriptomic data on AUX/IAA genes was gathered, and subsequent mutant analysis was performed. KEY RESULTS: Ethylene and BR have opposite effects in regulating shoot gravitropism. Lack of BR enhances gravitropic reorientation in 2-d-old seedlings, whereas ethylene does not. Lack of ethylene signaling results in enhanced BR sensitivity. Ethylene and BRs regulate overlapping sets of AUX/IAA genes. BRs regulate a wider range of auxin signaling components than ethylene. CONCLUSIONS: Upward growth in seedlings depends strongly on the internal hormonal balance. Endogenous ethylene stimulates, whereas BRs reduce negative gravitropism in a manner that depends on the function of different, yet overlapping sets of auxin signaling components.
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Claims 9
Claim · model-written summary
Ethylene and BR had opposite effects on shoot gravitropism.
- Taxon
- Arabidopsis thaliana
Arabidopsis thalianae1 - Outcome
- shoot gravitropisme0
- Direction
- oppositee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ethylene and BR have opposite effects in regulating shoot gravitropism.”
e1“gravistimulated seedlings of Arabidopsis thaliana”
Claim · model-written summary
Lack of BR enhanced gravitropic reorientation in 2-day-old seedlings.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Organ / stage
- 2-d-old seedlingse0
- Treatment
- Lack of BRe0
- Outcome
- gravitropic reorientatione0
- Direction
- enhancese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lack of BR enhances gravitropic reorientation in 2-d-old seedlings”
e1“gravistimulated seedlings of Arabidopsis thaliana”
Claim · model-written summary
Ethylene did not enhance gravitropic reorientation in 2-day-old seedlings.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Treatment
- ethylenee0
- Outcome
- gravitropic reorientatione0
- Direction
- does note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lack of BR enhances gravitropic reorientation in 2-d-old seedlings, whereas ethylene does not.”
e1“gravistimulated seedlings of Arabidopsis thaliana”
Claim · model-written summary
Lack of ethylene signaling enhanced BR sensitivity.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Treatment
- Lack of ethylene signalinge0
- Outcome
- BR sensitivitye0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lack of ethylene signaling results in enhanced BR sensitivity.”
e1“gravistimulated seedlings of Arabidopsis thaliana”
Claim · model-written summary
Ethylene and BR regulated overlapping AUX/IAA gene sets.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Gene
- AUX/IAA genese0
- Outcome
- overlapping sets of AUX/IAA genese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ethylene and BRs regulate overlapping sets of AUX/IAA genes.”
e1“gravistimulated seedlings of Arabidopsis thaliana”
Claim · model-written summary
BRs regulated a wider range of auxin signaling components than ethylene.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Outcome
- range of auxin signaling componentse0
- Direction
- widere0
- Comparator
- ethylenee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BRs regulate a wider range of auxin signaling components than ethylene.”
e1“gravistimulated seedlings of Arabidopsis thaliana”
Claim · model-written summary
The authors conclude that internal hormone balance strongly affects upward seedling growth.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Outcome
- Upward growth in seedlingse0
- Qualifier
- internal hormonal balancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Upward growth in seedlings depends strongly on the internal hormonal balance.”
e1“gravistimulated seedlings of Arabidopsis thaliana”
Claim · model-written summary
Endogenous ethylene stimulates negative gravitropism.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Compound
- Endogenous ethylenee0
- Outcome
- negative gravitropisme0
- Direction
- stimulatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Endogenous ethylene stimulates, whereas BRs reduce negative gravitropism”
e1“gravistimulated seedlings of Arabidopsis thaliana”
Claim · model-written summary
BRs reduce negative gravitropism, depending on auxin signaling components.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae1
- Compound
- BRse0
- Outcome
- negative gravitropisme0
- Direction
- reducee0
- Qualifier
- different, yet overlapping sets of auxin signaling componentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BRs reduce negative gravitropism in a manner that depends on the function of different, yet overlapping sets of auxin signaling components.”
e1“gravistimulated seedlings of Arabidopsis thaliana”
The same questions in other papers
ethene · molecular: metabolites · Arabidopsis thaliana (thale cress)Positive and negative results
5 papers in the same direction as this paper · 1 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- positive
4 papers more in this group
See all 8 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.