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The sugar transporter SWEET10 acts downstream of FLOWERING LOCUS T during floral transition of Arabidopsis thaliana
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The sugar transporter SWEET10 acts downstream of FLOWERING LOCUS T during floral transition of Arabidopsis thaliana
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The sugar transporter SWEET10 acts downstream of FLOWERING LOCUS T during floral transition of Arabidopsis thaliana
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Journal Article
The sugar transporter SWEET10 acts downstream of FLOWERING LOCUS T during floral transition of Arabidopsis thaliana
2020
Overview
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.
