AGAMOUSTerminates Floral Stem Cell Maintenance inArabidopsisby Directly RepressingWUSCHELthrough Recruitment of Polycomb Group Proteins

Liu, Xigang; Kim, Yun Ju; Müller, Ralf; Yumul, Rae Eden; Liu, Chunyan; Pan, Yanyun; Cao, Xiaofeng; Goodrich, Justin; Chen, Xuemei

doi:10.1105/tpc.111.091538

Cited by 256 publications

(316 citation statements)

References 69 publications

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“…4D), indicating that a bona fide FM remains functional in sup-1 flowers longer than it does in the wild type. AG is responsible for triggering stem cell termination in wild-type flowers by turning off the expression of WUS (18)(19)(20)(21), and most mutants with a delay or loss of floral stem cell termination have defects in AG expression (4). We thus used the gAG-GFP reporter (22) to compare the expression of AG in wild-type and sup-1 flowers, and AG expression appears unaffected in sup-1 flowers (Fig.…”

Section: Resultsmentioning

confidence: 99%

SUPERMAN prevents class B gene expression and promotes stem cell termination in the fourth whorl of Arabidopsis thaliana flowers

Prunet

Yang

Das

et al. 2017

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

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The molecular and genetic networks underlying the determination of floral organ identity are well studied, but much less is known about how the flower is partitioned into four developmentally distinct whorls. The SUPERMAN gene is required for proper specification of the boundary between stamens in whorl 3 and carpels in whorl 4, as superman mutants exhibit supernumerary stamens but usually lack carpels. However, it has remained unclear whether extra stamens in superman mutants originate from an organ identity change in whorl 4 or the overproliferation of whorl 3. Using live confocal imaging, we show that the extra stamens in superman mutants arise from cells in whorl 4, which change their fate from female to male, while floral stem cells proliferate longer, allowing for the production of additional stamens

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Section: Resultsmentioning

confidence: 99%

SUPERMAN prevents class B gene expression and promotes stem cell termination in the fourth whorl of Arabidopsis thaliana flowers

Prunet

Yang

Das

et al. 2017

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

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“…Within the SAM, WUS is expressed specifically in the stem cell organizing center and acts both independently and complementarily with STM in the maintenance of stem cell activity (Laux et al, 1996;Mayer et al, 1998). During flower development, AG terminates stem cell maintenance by repressing WUS by directly or indirectly recruiting PRC2 and LHP1 (Liu et al, 2011;Sun et al, 2014). Interestingly, AtZRF1a/b are not required for the repression of AG and WUS, because expression levels of both AG and WUS are down-regulated in the atzrf1a atzrf1b mutant.…”

Section: Discussionmentioning

confidence: 99%

ZRF1 Chromatin Regulators Have Polycomb Silencing and Independent Roles in Development

Feng

Chen²,

Berr³

et al. 2016

Plant Physiol.

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“…2). It was shown that AG binds to CArG box sequences in the WUS promoter and recruits a Polycomb group (PcG) complex involved in the stable silencing of gene expression through covalent histone modifications (Liu et al, 2011). As a consequence of this direct regulation, WUS expression declines over time.…”

Section: Control Of Floral Meristem Determinacymentioning

confidence: 99%

Floral Organogenesis: When Knowing Your ABCs Is Not Enough

2016

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Flower development is one of the particularly wellestablished model systems for investigating the molecular and genetic mechanisms underlying organogenesis in plants. Over the past 30 years, this work has led to detailed insights into many of the cellular and developmental processes that occur during the formation of flowers. This progress was made possible especially by the identification and characterization of the floral organ identity factors, which specify the different floral organ types in a combinatorial manner. However, in recent years, the genes that act downstream of these master regulators have taken center stage because it has become increasingly clear that they execute many of the functions originally attributed to the floral organ identity factors. In this Update, we will summarize and discuss our current view of floral organogenesis with particular emphasis on recent progress in the field (see "Advances" box). We will briefly describe the latest models for floral organ identity factor function and outline open questions that need to be addressed to better understand how they act at the mechanistic level. Furthermore, we will discuss studies that have begun to reveal how a complex interplay of transcription factors, hormones, regulatory RNAs, and epigenetic modifiers controls different developmental processes during the formation of flowers. Last, we will outline recent efforts to better understand the evolution of flowers and venture a look ahead at likely future developments in the field of flowering research.

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AGAMOUSTerminates Floral Stem Cell Maintenance inArabidopsisby Directly RepressingWUSCHELthrough Recruitment of Polycomb Group Proteins

Cited by 256 publications

References 69 publications

SUPERMAN prevents class B gene expression and promotes stem cell termination in the fourth whorl of Arabidopsis thaliana flowers

SUPERMAN prevents class B gene expression and promotes stem cell termination in the fourth whorl of Arabidopsis thaliana flowers

ZRF1 Chromatin Regulators Have Polycomb Silencing and Independent Roles in Development

Floral Organogenesis: When Knowing Your ABCs Is Not Enough

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