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    AGAMOUS mediates timing of guard cell formation during gynoecium development

    Brazel, Ailbhe J. and Fattorini, Róisín and McCarthy, Jesse and Franzen, Rainer and Rümpler, Florian and Coupland, George and Ó’Maoiléidigh, Diarmuid S. (2023) AGAMOUS mediates timing of guard cell formation during gynoecium development. PLOS Genetics, 19 (10). e1011000. ISSN 1553-7404

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    In Arabidopsis thaliana, stomata are composed of two guard cells that control the aperture of a central pore to facilitate gas exchange between the plant and its environment, which is particularly important during photosynthesis. Although leaves are the primary photosynthetic organs of flowering plants, floral organs are also photosynthetically active. In the Brassicaceae, evidence suggests that silique photosynthesis is important for optimal seed oil content. A group of transcription factors containing MADS DNA binding domains is necessary and sufficient to confer floral organ identity. Elegant models, such as the ABCE model of flower development and the floral quartet model, have been instrumental in describing the molecular mechanisms by which these floral organ identity proteins govern flower development. However, we lack a complete understanding of how the floral organ identity genes interact with the underlying leaf development program. Here, we show that the MADS domain transcription factor AGAMOUS (AG) represses stomatal development on the gynoecial valves, so that maturation of stomatal complexes coincides with fertilization. We present evidence that this regulation by AG is mediated by direct transcriptional repression of a master regulator of the stomatal lineage, MUTE, and show data that suggests this interaction is conserved among several members of the Brassicaceae. This work extends our understanding of the mechanisms underlying floral organ formation and provides a framework to decipher the mechanisms that control floral organ photosynthesis.

    Item Type: Article
    Additional Information: Cite as: Brazel AJ, Fattorini R, McCarthy J, Franzen R, Rümpler F, Coupland G, et al. (2023) AGAMOUS mediates timing of guard cell formation during gynoecium development. PLoS Genet 19(10): e1011000.
    Keywords: stomata; photosynthesis; MADS DNA binding;
    Academic Unit: Faculty of Science and Engineering > Biology
    Item ID: 17741
    Identification Number:
    Depositing User: Ailbhe Brazel
    Date Deposited: 26 Oct 2023 11:55
    Journal or Publication Title: PLOS Genetics
    Refereed: Yes
      Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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