ORCID Profile
0000-0002-3470-1943
Current Organisations
Faculty of Sciences, University of Porto
,
Associação BIOPOLIS-CIBIO
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Publisher: Elsevier BV
Date: 12-2008
DOI: 10.1016/J.DEVCEL.2008.09.019
Abstract: Because plant cells do not migrate, cell ision planes are crucial determinants of plant cellular architecture. In Arabidopsis roots, stringent control of cell isions leads to a virtually invariant ision pattern, including those that create new tissue layers. However, the mechanisms that control oriented cell isions are hitherto poorly understood. Here, we reveal one such mechanism in which FEZ and SOMBRERO (SMB), two plant-specific NAC-domain transcription factors, control the delicately tuned reorientation and timing of cell ision in a subset of stem cells. FEZ is expressed in root cap stem cells, where it promotes periclinal, root cap-forming cell isions. In contrast, SMB negatively regulates FEZ activity, repressing stem cell-like isions in the root cap daughter cells. FEZ becomes expressed in pre ision stem cells, induces oriented cell ision, and activates expression of its negative regulator, SMB, thus generating a feedback loop for controlled switches in cell ision plane.
Publisher: Springer Science and Business Media LLC
Date: 21-04-2010
DOI: 10.1038/NATURE08977
Publisher: Wiley
Date: 07-03-2019
DOI: 10.1111/NPH.15725
Publisher: Elsevier BV
Date: 12-2011
DOI: 10.1016/J.DEVCEL.2011.10.006
Abstract: Plant cells are connected through plasmodesmata (PD), membrane-lined channels that allow symplastic movement of molecules between cells. However, little is known about the role of PD-mediated signaling during plant morphogenesis. Here, we describe an Arabidopsis gene, CALS3/GSL12. Gain-of-function mutations in CALS3 result in increased accumulation of callose (β-1,3-glucan) at the PD, a decrease in PD aperture, defects in root development, and reduced intercellular trafficking. Enhancement of CALS3 expression during phloem development suppressed loss-of-function mutations in the phloem abundant callose synthase, CALS7 indicating that CALS3 is a bona fide callose synthase. CALS3 alleles allowed us to spatially and temporally control the PD aperture between plant tissues. Using this tool, we are able to show that movement of the transcription factor SHORT-ROOT and microRNA165 between the stele and the endodermis is PD dependent. Taken together, we conclude that regulated callose biosynthesis at PD is essential for cell signaling.
Location: Portugal
No related grants have been discovered for Ana Campilho.