Abstract
The gibberellin class of plant hormones has been implicated in the control of flowering in several species. In Arabidopsis, severe reduction of endogenous gibberellins delays flowering in long days and prevents flowering in short days. We have investigated how the differential effects of gibberellins on flowering correlate with expression of LEAFY, a floral meristem identity gene. We have found that the failure of gibberellin-deficient ga1-3 mutants to flower in short days was paralleled by the absence of LEAFY promoter induction. A causal connection between these two events was confirmed by the ability of a constitutively expressed LEAFY transgene to restore flowering to ga1-3 mutants in short days. In contrast to short days, impairment of gibberellin biosynthesis caused merely a reduction of LEAFY expression when plants were grown in long days or with sucrose in the dark. As a first step toward identifying other small molecules that might regulate flowering, we have developed a rapid in vitro assay for LEAFY promoter activity.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 7
Claim · model-written summary
Severe reduction of endogenous gibberellins delayed flowering in long days.
- Taxon
- Arabidopsis
Arabidopsise0 - Outcome
- floweringe0
- Direction
- delayse0
- Qualifier
- long dayse0
Not reportedMaterialTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In Arabidopsis, severe reduction of endogenous gibberellins delays flowering in long days and prevents flowering in short days.”
Claim · model-written summary
Severe reduction of endogenous gibberellins prevented flowering in short days.
- Taxon
- ArabidopsisArabidopsise0
- Outcome
- floweringe0
- Direction
- preventse0
- Qualifier
- short dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In Arabidopsis, severe reduction of endogenous gibberellins delays flowering in long days and prevents flowering in short days.”
Claim · model-written summary
Failure of gibberellin-deficient ga1-3 mutants to flower in short days coincided with absence of LEAFY promoter induction.
- Taxon
- ArabidopsisArabidopsist0
- Material
- ga1-3 mutantse0
- Gene
- LEAFYe0
- Outcome
- LEAFY promoter inductione0
- Direction
- absencee0
- Qualifier
- short dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the failure of gibberellin-deficient ga1-3 mutants to flower in short days was paralleled by the absence of LEAFY promoter induction.”
t0“Arabidopsis”
Claim · model-written summary
Constitutive LEAFY expression restored flowering to ga1-3 mutants in short days.
- Taxon
- ArabidopsisArabidopsist0
- Material
- ga1-3 mutantse0
- Treatment
- a constitutively expressed LEAFY transgenee0
- Gene
- LEAFYe0
- Outcome
- floweringe0
- Direction
- restoree0
- Qualifier
- short dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a constitutively expressed LEAFY transgene to restore flowering to ga1-3 mutants in short days.”
t0“Arabidopsis”
Claim · model-written summary
Impaired gibberellin biosynthesis reduced LEAFY expression in long days.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- impairment of gibberellin biosynthesise0
- Gene
- LEAFYe0
- Outcome
- LEAFY expressione0
- Direction
- reductione0
- Qualifier
- long dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“impairment of gibberellin biosynthesis caused merely a reduction of LEAFY expression when plants were grown in long days or with sucrose in the dark.”
t0“Arabidopsis”
Claim · model-written summary
Impaired gibberellin biosynthesis reduced LEAFY expression with sucrose in the dark.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- impairment of gibberellin biosynthesise0
- Gene
- LEAFYe0
- Outcome
- LEAFY expressione0
- Direction
- reductione0
- Qualifier
- with sucrose in the darke0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“impairment of gibberellin biosynthesis caused merely a reduction of LEAFY expression when plants were grown in long days or with sucrose in the dark.”
t0“Arabidopsis”
Claim · model-written summary
A rapid in vitro assay for LEAFY promoter activity was developed.
- Taxon
- ArabidopsisArabidopsist0
- Gene
- LEAFYe0
- Outcome
- a rapid in vitro assay for LEAFY promoter activitye0
Not reportedComparatorDirectionValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Schema note from the model: Resource description lacks a comparator or magnitude.
Verbatim
e0“we have developed a rapid in vitro assay for LEAFY promoter activity.”
t0“Arabidopsis”
The same questions in other papers
class · molecular: expression · ArabidopsisPositive and negative results
28 papers in the same direction as this paper · 46 in the opposite direction
- positive
- positive
- positive
71 papers more in this group
See all 75 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.