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A cell surface arabinogalactan ‐ peptide influences root hair cell fate

Colaborador(es): Borassi, Cecilia. CONICET. Fundación Instituto Leloir (IIBBA) . Buenos Aires, Argentina | Gloazzo Dorosz, Javier. CONICET. Fundación Instituto Leloir (IIBBA) . Buenos Aires, Argentina | Ricardi, Martiniano María. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Fisiologıa y Biologıa Molecular y Celular (FBMC). Instituto de Fisiología, Biología Molecular y Neurociencias (IFIByNE). Buenos Aires, Argentina. CONICET - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Fisiologıa y Biologıa Molecular y Celular (FBMC). Instituto de Fisiología, Biología Molecular y Neurociencias (IFIByNE). Buenos Aires, Argentina | Carignani Sardoy, Mariana. CONICET. Fundación Instituto Leloir (IIBBA) . Buenos Aires, Argentina | Pol Fachin, Laercio. Centro Universitário. CESMAC. Maceio, Brazil | Marzol, Eliana. CONICET. Fundación Instituto Leloir (IIBBA) . Buenos Aires, Argentina | Mangano, Silvina. CONICET. Fundación Instituto Leloir (IIBBA) . Buenos Aires, Argentina | Ciancia, Marina. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Biología Aplicada y Alimentos. Cátedra de Química de Biomoléculas. Buenos Aires, Argentina. Universidad de Buenos Aires. Centro de Investigación de Hidratos de Carbono (CIHIDECAR). Buenos Aires, Argentina. CONICET - Universidad de Buenos Aires. Centro de Investigación de Hidratos de Carbono (CIHIDECAR). Buenos Aires, Argentina.
ISSN: 0028-646X.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): ARABIDOPSIS THALIANA | ARABINOGALACTAN PEPTIDE 21 | BRASSINOSTEROIDS | O ‐ GLYCOSYLATION | ROOT HAIR CELL FATE | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR En: New phytologist vol.227, no.3 (2020), p.732–743, grafs., fot.Resumen: Root hairs (RHs) develop from specialized epidermal trichoblast cells, whereas epidermal cells that lack RHs are known as atrichoblasts. The mechanism controlling RH cell fate is only partially understood. RH cell fate is regulated by a transcription factor complex that promotes the expression of the homeodomain protein GLABRA 2 (GL2), which blocks RH development by inhibiting ROOT HAIR DEFECTIVE 6 (RHD6). Suppression of GL2 expression activates RHD6, a series of downstream TFs including ROOT HAIR DEFECTIVE 6 LIKE‐4 (RSL4) and their target genes, and causes epidermal cells to develop into RHs. Brassinosteroids (BRs) influence RH cell fate. In the absence of BRs, phosphorylated BIN2 (a Type‐II GSK3‐like kinase) inhibits a protein complex that regulates GL2 expression. Perturbation of the arabinogalactan peptide (AGP21) in Arabidopsis thaliana triggers aberrant RH development, similar to that observed in plants with defective BR signaling. We reveal that an O‐glycosylated AGP21 peptide, which is positively regulated by BZR1, a transcription factor activated by BR signaling, affects RH cell fate by altering GL2 expression in a BIN2‐dependent manner. Changes in cell surface AGP disrupts BR responses and inhibits the downstream effect of BIN2 on the RH repressor GL2 in root epidermis.
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Root hairs (RHs) develop from specialized epidermal trichoblast cells, whereas epidermal cells that lack RHs are known as atrichoblasts. The mechanism controlling RH cell fate is only partially understood.
RH cell fate is regulated by a transcription factor complex that promotes the expression of the homeodomain protein GLABRA 2 (GL2), which blocks RH development by inhibiting ROOT HAIR DEFECTIVE 6 (RHD6). Suppression of GL2 expression activates RHD6, a series of downstream TFs including ROOT HAIR DEFECTIVE 6 LIKE‐4 (RSL4) and their target genes, and causes epidermal cells to develop into RHs. Brassinosteroids (BRs) influence RH cell fate. In the absence of BRs, phosphorylated BIN2 (a Type‐II GSK3‐like kinase) inhibits a protein complex that regulates GL2 expression.
Perturbation of the arabinogalactan peptide (AGP21) in Arabidopsis thaliana triggers aberrant RH development, similar to that observed in plants with defective BR signaling. We reveal that an O‐glycosylated AGP21 peptide, which is positively regulated by BZR1, a transcription factor activated by BR signaling, affects RH cell fate by altering GL2 expression in a BIN2‐dependent manner.
Changes in cell surface AGP disrupts BR responses and inhibits the downstream effect of BIN2 on the RH repressor GL2 in root epidermis.

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