Abstract
Lateral organs produced by shoot apical and flower meristems exhibit a fundamental abaxial-adaxial asymmetry. We describe three members of the YABBY gene family, FILAMENTOUS FLOWER, YABBY2 and YABBY3, isolated on the basis of homology to CRABS CLAW. Each of these genes is expressed in a polar manner in all lateral organ primordia produced from the apical and flower meristems. The expression of these genes is precisely correlated with abaxial cell fate in mutants in which abaxial cell fates are found ectopically, reduced or eliminated. Ectopic expression of either FILAMENTOUS FLOWER or YABBY3 is sufficient to specify the development of ectopic abaxial tissues in lateral organs. Conversely, loss of polar expression of these two genes results in a loss of polar differentiation of tissues in lateral organs. Taken together, these observations indicate that members of this gene family are responsible for the specification of abaxial cell fate in lateral organs of Arabidopsis. Furthermore, ectopic expression studies suggest that ubiquitous abaxial cell fate and maintenance of a functional apical meristem are incompatible.
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Claims 7
Claim · model-written summary
FILAMENTOUS FLOWER, YABBY2 and YABBY3 are YABBY family members homologous to CRABS CLAW.
- Taxon
- Arabidopsis
Arabidopsist0 - Gene
- YABBY gene familye0
- Outcome
- isolated on the basis of homology to CRABS CLAWe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“three members of the YABBY gene family, FILAMENTOUS FLOWER, YABBY2 and YABBY3, isolated on the basis of homology to CRABS CLAW”
t0“Arabidopsis”
Claim · model-written summary
The three YABBY genes are expressed polarly in lateral organ primordia.
- Taxon
- ArabidopsisArabidopsist0
- Organ / stage
- lateral organ primordiae0
- Gene
- YABBYt0
- Outcome
- expressed in a polar mannere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Each of these genes is expressed in a polar manner in all lateral organ primordia produced from the apical and flower meristems”
t0“YABBY gene family specify abaxial cell fate in Arabidopsis”
Claim · model-written summary
YABBY expression correlates with abaxial cell fate in mutants.
- Taxon
- ArabidopsisArabidopsist0
- Gene
- YABBYt0
- Outcome
- abaxial cell fatee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The expression of these genes is precisely correlated with abaxial cell fate in mutants in which abaxial cell fates are found ectopically, reduced or eliminated”
t0“YABBY gene family specify abaxial cell fate in Arabidopsis”
Claim · model-written summary
Ectopic FILAMENTOUS FLOWER expression specifies ectopic abaxial tissue.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- Ectopic expression of either FILAMENTOUS FLOWERe0
- Gene
- FILAMENTOUS FLOWERe0
- Outcome
- development of ectopic abaxial tissuese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ectopic expression of either FILAMENTOUS FLOWER or YABBY3 is sufficient to specify the development of ectopic abaxial tissues in lateral organs”
t0“Arabidopsis”
Claim · model-written summary
Ectopic YABBY3 expression specifies ectopic abaxial tissue.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- YABBY3e0
- Gene
- YABBY3e0
- Outcome
- development of ectopic abaxial tissuese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ectopic expression of either FILAMENTOUS FLOWER or YABBY3 is sufficient to specify the development of ectopic abaxial tissues in lateral organs”
t0“Arabidopsis”
Claim · model-written summary
Loss of polar expression of the two genes causes loss of polar tissue differentiation.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- loss of polar expressione0
- Outcome
- polar differentiation of tissuese0
- Direction
- losse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“loss of polar expression of these two genes results in a loss of polar differentiation of tissues in lateral organs”
t0“Arabidopsis”
Claim · model-written summary
Ubiquitous abaxial fate may be incompatible with functional apical meristems.
- Taxon
- ArabidopsisArabidopsist0
- Outcome
- maintenance of a functional apical meristeme0
- Qualifier
- ubiquitous abaxial cell fatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ubiquitous abaxial cell fate and maintenance of a functional apical meristem are incompatible”
t0“Arabidopsis”
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