AGAMOUS mediates timing of guard cell formation during gynoecium development.

Brazel, Ailbhe J, Fattorini, Róisín, McCarthy, Jesse, Franzen, Rainer, Rümpler, Florian ORCID: 0000-0003-4986-2595, Coupland, George and Ó'Maoiléidigh, Diarmuid S ORCID: 0000-0002-3043-3750 (2023) AGAMOUS mediates timing of guard cell formation during gynoecium development. PLoS genetics, 19 (10). e1011000-.

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Official URL: http://dx.doi.org/10.1371/journal.pgen.1011000

Abstract

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
Uncontrolled Keywords:	Arabidopsis, Flowers, Plant Leaves, MADS Domain Proteins, Plant Proteins, Arabidopsis Proteins, Transcription Factors, Gene Expression Regulation, Plant
Divisions:	Faculty of Health and Life Sciences Faculty of Health and Life Sciences > Institute of Systems, Molecular and Integrative Biology
Depositing User:	Symplectic Admin
Date Deposited:	13 Dec 2023 11:44
Last Modified:	13 Dec 2023 11:44
DOI:	10.1371/journal.pgen.1011000
Open Access URL:	https://doi.org/10.1371/journal.pgen.1011000
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3177311