Temporal and spatial frameworks supporting plant responses to vegetation proximity

Mikel Urdin-Bravo, Beatriz Martín-Mur, Jordi Moreno-Romero, Aurelio Gomez-Cadenas, Jaume F. Martínez-García*, Anna Esteve-Codina, Julia Palau-Rodriguez, Sandi Paulisic, Elizabeth Kastanaki, Pedro Pastor-Andreu, Vicente Vives-Peris, Antía Rodríguez-Villalón

*Autor corresponent d’aquest treball

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Resum

After the perception of vegetation proximity by phytochrome photoreceptors, shade-avoider plants initiate a set of responses known as the shade avoidance syndrome (SAS). Shade perception by the phytochrome B (phyB) photoreceptor unleashes the PHYTOCHROME INTERACTING FACTORs and initiates SAS responses. In Arabidopsis (Arabidopsis thaliana) seedlings, shade perception involves rapid and massive changes in gene expression, increases auxin production, and promotes hypocotyl elongation. Other components, such as phyA and ELONGATED HYPOCOTYL 5, also participate in the shade regulation of the hypocotyl elongation response by repressing it. However, why and how so many regulators with either positive or negative activities modulate the same response remains unclear. Our physiological, genetic, cellular, and transcriptomic analyses showed that (i) these components are organized into 2 main branches or modules and (ii) the connection between them is dynamic and changes with the time of shade exposure. We propose a model for the regulation of shade-induced hypocotyl elongation in which the temporal and spatial functional importance of the various SAS regulators analyzed here helps to explain the coexistence of differentiated regulatory branches with overlapping activities.

Idioma originalAnglès
Pàgines (de-a)2048-2063
Nombre de pàgines16
RevistaPlant Physiology
Volum196
Número3
DOIs
Estat de la publicacióPublicada - 14 d’ag. 2024

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