Gibberellins negatively modulate ovule number in plants

[EN] 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) an...

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Bibliographic Details
Authors: Gómez Jiménez, Maria Dolores, Briones-Moreno, Asier, Vera-Sirera, Francisco|||0000-0002-1143-7692, Carrera Bergua, Esther|||0000-0002-3454-7552, PEREZ AMADOR, MIGUEL ANGEL|||0000-0003-4518-3544, Barro-Trastoy, Daniela, Escoms, E., Saura-Sanchez, M., Sanchez, I., Ripoll, J.J., Yanofsky, Martin, Lopez Diaz, Isabel, Alonso, J.M.
Format: article
Publication Date:2018
Country:España
Institution:Universitat Politècnica de València (UPV)
Repository:RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
Language:English
OAI Identifier:oai:riunet.upv.es:10251/145749
Online Access:https://riunet.upv.es/handle/10251/145749
Access Level:Open access
Keyword:Ovule
Seed
Gibberellin
Auxin
Arabidopsis
Tomato
BIOQUIMICA Y BIOLOGIA MOLECULAR
GENETICA
Description
Summary:[EN] 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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