Gibberellins negatively modulate ovule number in plants

• Autores: Gómez, María D.; Barro Trastoy, Daniela; Escoms, Ernesto; Saura Sánchez, Maite; Sánchez, Inés; Briones Moreno, Asier; Vera Sirera, Francisco; Carrera, Esther
• Año de publicación: 2018
• Idioma: inglés
• Tipo de recurso: artículo
• Fuente: Development; Vol.145; dev163865, 11; https://www.biologists.com/
• Materia: OVULE; SEED; GIBBERELLIN; AUXIN; ARABIDOPSIS; TOMATO
• Institución: Universidad de Buenos Aires. Facultad de Agronomía

Fil: Gómez, María D. Universidad Politécnica de Valencia. Instituto de Biología Molecular y Celular de Plantas (IBMCP). Valencia, Spain.
Fil: Barro Trastoy, Daniela. Universidad Politécnica de Valencia. Instituto de Biología Molecular y Celular de Plantas (IBMCP). Valencia, Spain.
Fil: Escoms, Ernesto. Universidad Politécnica de Valencia. Instituto de Biología Molecular y Celular de Plantas (IBMCP). Valencia, Spain.
Fil: Saura Sánchez, Maite. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Fil: Sánchez, Inés. Universidad Politécnica de Valencia. Instituto de Biología Molecular y Celular de Plantas (IBMCP). Valencia, Spain.
Fil: Briones Moreno, Asier. Universidad Politécnica de Valencia. Instituto de Biología Molecular y Celular de Plantas (IBMCP). Valencia, Spain.
Fil: Vera Sirera, Francisco. Universidad Politécnica de Valencia. Instituto de Biología Molecular y Celular de Plantas (IBMCP). Valencia, Spain.
Fil: Carrera, Esther. Universidad Politécnica de Valencia. Instituto de Biología Molecular y Celular de Plantas (IBMCP). Valencia, Spain.
Ovule formation is a complex developmental process in plants, with a strong impact on the production of seeds. Ovule primordia initiation is controlled by a gene network, including components of the signaling pathways of auxin, brassinosteroids and cytokinins. By contrast, gibberellins (GAs) and DELLA proteins, the negative regulators of GA signaling, have never been shown to be involved in ovule initiation. Here, we provide molecular and genetic evidence that points to DELLA proteins as novel players in the determination of ovule number in Arabidopsis and in species of agronomic interest, such as tomato and rapeseed, adding a new layer of complexity to this important developmental process. DELLA activity correlates positively with ovule number, acting as a positive factor for ovule initiation. In addition, ectopic expression of a dominant DELLA in the placenta is sufficient to increase ovule number. The role of DELLA proteins in ovule number does not appear to be related to auxin transport or signaling in the ovule primordia. Possible crosstalk between DELLA proteins and the molecular and hormonal network controlling ovule initiation is also discussed.
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