TERMINAL FLOWER1 Is a Mobile Signal Controlling<i>Arabidopsis</i>Architecture

Conti, Lucio; Bradley, Desmond

doi:10.1105/tpc.106.049767

Cited by 221 publications

(234 citation statements)

References 79 publications

(111 reference statements)

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“…6). 5F) and was reported to be a mobile signal that mediates the transition to flowering (41,42). CLV proteins are responsible for controlling the size of the SAM; they restrict the population of stem cells by limiting the expression of the transcription factor WUSCHEL (WUS) in the peripheral zone of the meristem (36,43,44).…”

Section: Resultsmentioning

confidence: 99%

The shoot meristem identity gene TFL1 is involved in flower development and trafficking to the protein storage vacuole

Sohn

Rojas-Pierce

Pan

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

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Plants are unique in their ability to store proteins in specialized protein storage vacuoles (PSVs) within seeds and vegetative tissues. Although plants use PSV proteins during germination, before photosynthesis is fully functional, the roles of PSVs in adult vegetative tissues are not understood. Trafficking pathways to PSVs and lytic vacuoles appear to be distinct. Lytic vacuoles are analogous evolutionarily to yeast and mammalian lysosomes. However, it is unclear whether trafficking to PSVs has any analogy to pathways in yeast or mammals, nor is PSV ultrastructure known in Arabidopsis vegetative tissue. Therefore, alternative approaches are required to identify components of this pathway. Here, we show that an Arabidopsis thaliana mutant that disrupts PSV trafficking identified TERMINAL FLOWER 1 (TFL1), a shoot meristem identity gene. The tfl1-19/mtv5 (for ''modified traffic to the vacuole'') mutant is specifically defective in trafficking of proteins to the PSV. TFL1 localizes to endomembrane compartments and colocalizes with the putative ␦-subunit of the AP-3 adapter complex. Our results suggest a developmental role for the PSV in vegetative tissues.protein trafficking ͉ vegetative tissue ͉ adaptin

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Section: Resultsmentioning

confidence: 99%

The shoot meristem identity gene TFL1 is involved in flower development and trafficking to the protein storage vacuole

Sohn

Rojas-Pierce

Pan

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

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“…The expression of APETALA1-like (Sb02g038780.1) was reduced approximately 3-fold in phyB-1 buds at 8 DAP. The expression of the APETALA1-like and LFY3 is repressed by TFL1 in different domains of the Arabidopsis shoot apical meristem (Conti and Bradley, 2007).…”

Section: Differential Expression Of Genes That Regulate Meristem Diffmentioning

confidence: 99%

“…TFL1 is expressed in the shoot apical meristem and axillary meristems of Arabidopsis (Conti and Bradley, 2007), maize (Danilevskaya et al, 2010), and sorghum. The proposed function of Elevated expression of the TFL1-like gene SbCN2 in phyB-1 sorghum tiller buds is to protect these vegetative axillary meristems from florigenic signals in a manner similar to perennial plants.…”

Section: Maintenance Of Bud Vegetative Meristems In Phyb-1 Sorghummentioning

confidence: 99%

Transcriptome Profiling of Tiller Buds Provides New Insights into PhyB Regulation of Tillering and Indeterminate Growth in Sorghum

Kebrom

Mullet

2016

Plant Physiol.

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Phytochrome B (phyB) enables plants to modify shoot branching or tillering in response to varying light intensities and ratios of red and far-red light caused by shading and neighbor proximity. Tillering is inhibited in sorghum genotypes that lack phytochrome B (58M, phyB-1) until after floral initiation. The growth of tiller buds in the first leaf axil of wild-type (100M, PHYB) and phyB-1 sorghum genotypes is similar until 6 d after planting when buds of phyB-1 arrest growth, while wild-type buds continue growing and develop into tillers. Transcriptome analysis at this early stage of bud development identified numerous genes that were up to 50-fold differentially expressed in wild-type/phyB-1 buds. Up-regulation of terminal flower1, GA2oxidase, and TPPI could protect axillary meristems in phyB-1 from precocious floral induction and decrease bud sensitivity to sugar signals. After bud growth arrest in phyB-1, expression of dormancy-associated genes such as DRM1, GT1, AF1, and CKX1 increased and ENOD93, ACCoxidase, ARR3/6/9, CGA1, and SHY2 decreased. Continued bud outgrowth in wild-type was correlated with increased expression of genes encoding a SWEET transporter and cell wall invertases. The SWEET transporter may facilitate Suc unloading from the phloem to the apoplast where cell wall invertases generate monosaccharides for uptake and utilization to sustain bud outgrowth. Elevated expression of these genes was correlated with higher levels of cytokinin/sugar signaling in growing buds of wild-type plants.

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“…At the vegetative stage, TFL1 mRNA is weakly expressed in the lower part of the apical meristem, whereas the protein can move short distances to repress flowering in the main apex. After flower induction, TFL1 is strongly up-regulated to maintain the indeterminate inflorescence meristem (Shannon and Meeks-Wagner, 1991;Bradley et al, 1997;Ratcliffe et al, 1999;Conti and Bradley, 2007).…”

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confidence: 99%

Mutation inTERMINAL FLOWER1Reverses the Photoperiodic Requirement for Flowering in the Wild StrawberryFragaria vesca

et al. 2012

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Photoperiodic flowering has been extensively studied in the annual short-day and long-day plants rice (Oryza sativa) and Arabidopsis (Arabidopsis thaliana), whereas less is known about the control of flowering in perennials. In the perennial wild strawberry, Fragaria vesca (Rosaceae), short-day and perpetual flowering long-day accessions occur. Genetic analyses showed that differences in their flowering responses are caused by a single gene, SEASONAL FLOWERING LOCUS, which may encode the F. vesca homolog of TERMINAL FLOWER1 (FvTFL1). We show through high-resolution mapping and transgenic approaches that FvTFL1 is the basis of this change in flowering behavior and demonstrate that FvTFL1 acts as a photoperiodically regulated repressor. In short-day F. vesca, long photoperiods activate FvTFL1 mRNA expression and short days suppress it, promoting flower induction. These seasonal cycles in FvTFL1 mRNA level confer seasonal cycling of vegetative and reproductive development. Mutations in FvTFL1 prevent long-day suppression of flowering, and the early flowering that then occurs under long days is dependent on the F. vesca homolog of FLOWERING LOCUS T. This photoperiodic response mechanism differs from those described in model annual plants. We suggest that this mechanism controls flowering within the perennial growth cycle in F. vesca and demonstrate that a change in a single gene reverses the photoperiodic requirements for flowering.

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TERMINAL FLOWER1 Is a Mobile Signal ControllingArabidopsisArchitecture

Cited by 221 publications

References 79 publications

The shoot meristem identity gene TFL1 is involved in flower development and trafficking to the protein storage vacuole

The shoot meristem identity gene TFL1 is involved in flower development and trafficking to the protein storage vacuole

Transcriptome Profiling of Tiller Buds Provides New Insights into PhyB Regulation of Tillering and Indeterminate Growth in Sorghum

Mutation inTERMINAL FLOWER1Reverses the Photoperiodic Requirement for Flowering in the Wild StrawberryFragaria vesca

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