Abstract
BACKGROUND: Floral transition initiates reproductive development of plants and occurs in response to environmental and endogenous signals. In Arabidopsis thaliana, this process is accelerated by several environmental cues, including exposure to long days. The photoperiod-dependent promotion of flowering involves the transcriptional induction of FLOWERING LOCUS T (FT) in the phloem of the leaf. FT encodes a mobile protein that is transported from the leaves to the shoot apical meristem, where it forms part of a regulatory complex that induces flowering. Whether FT also has biological functions in leaves of wild-type plants remains unclear. RESULTS: In order to address this issue, we first studied the leaf transcriptomic changes associated with FT overexpression in the companion cells of the phloem. We found that FT induces the transcription of SWEET10, which encodes a bidirectional sucrose transporter, specifically in the leaf veins. Moreover, SWEET10 is transcriptionally activated by long photoperiods, and this activation depends on FT and one of its earliest target genes SUPPRESSOR OF CONSTANS OVEREXPRESSION 1 (SOC1). The ectopic expression of SWEET10 causes early flowering and leads to higher levels of transcription of flowering-time related genes in the shoot apex. CONCLUSIONS: Collectively, our results suggest that the FT-signaling pathway activates the transcription of a sucrose uptake/efflux carrier during floral transition, indicating that it alters the metabolism of flowering plants as well as reprogramming the transcription of floral regulators in the shoot meristem.
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Claims 4
Claim · model-written summary
FT induces SWEET10 transcription in leaf veins.
- Taxon
- Arabidopsis thaliana
Arabidopsis thalianat0 - Organ / stage
- leaf veinse0
- Treatment
- FTe0
- Gene
- SWEET10e0
- Outcome
- transcription of SWEET10e0
- Direction
- inducese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“FT induces the transcription of SWEET10, which encodes a bidirectional sucrose transporter, specifically in the leaf veins.”
t0“Arabidopsis thaliana”
Claim · model-written summary
Long photoperiods activate SWEET10 transcription in an FT- and SOC1-dependent manner.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- long photoperiodse0
- Gene
- SWEET10e0
- Outcome
- SWEET10 is transcriptionally activatede0
- Direction
- activatede0
- Qualifier
- depends on FT and one of its earliest target genes SUPPRESSOR OF CONSTANS OVEREXPRESSION 1 (SOC1)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SWEET10 is transcriptionally activated by long photoperiods, and this activation depends on FT and one of its earliest target genes SUPPRESSOR OF CONSTANS OVEREXPRESSION 1 (SOC1).”
t0“Arabidopsis thaliana”
Claim · model-written summary
Ectopic SWEET10 expression causes early flowering.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- ectopic expression of SWEET10e0
- Gene
- SWEET10e0
- Outcome
- early floweringe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ectopic expression of SWEET10 causes early flowering and leads to higher levels of transcription of flowering-time related genes in the shoot apex.”
t0“Arabidopsis thaliana”
Claim · model-written summary
Ectopic SWEET10 expression increases transcription of flowering-time related genes in the shoot apex.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Organ / stage
- shoot apexe0
- Treatment
- ectopic expression of SWEET10e0
- Gene
- SWEET10e0
- Outcome
- transcription of flowering-time related genese0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ectopic expression of SWEET10 causes early flowering and leads to higher levels of transcription of flowering-time related genes in the shoot apex.”
t0“Arabidopsis thaliana”
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overexpression · phenology · Arabidopsis thaliana (thale cress)Positive and negative results
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See all 19 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.