Hypocotyl elongation of Arabidopsis seedlings is influenced by light and numerous growth factors. Light induces inhibition of hypocotyl elongation (photomorphogenesis), whereas in the dark hypocotyl elongation is promoted (skotomorphogenesis). Abscisic acid (ABA) plays a major role in inhibition of hypocotyl elongation, but the molecular mechanism remains unclear. We investigated the effect of ABA during photo- and skotomorphogenesis, making use of appropriate mutants, and we show that ABA negatively controls hypocotyl elongation acting on gibberellin (GA) metabolic genes, increasing the amount of the DELLA proteins GAI and RGA thus affecting GA signalling, and (ultimately) repressing auxin biosynthetic genes.

Abscisic acid inhibits hypocotyl elongation acting on gibberellins, DELLA proteins and auxin / Lorrai, Riccardo; Boccaccini, Alessandra; Ruta, Veronica; Marco, Possenti; Costantino, Paolo; Vittorioso, Paola. - In: AOB PLANTS. - ISSN 2041-2851. - 10:5(2018). [10.1093/aobpla/ply061]

Abscisic acid inhibits hypocotyl elongation acting on gibberellins, DELLA proteins and auxin

Riccardo Lorrai
Primo
Investigation
;
Alessandra Boccaccini
Secondo
Membro del Collaboration Group
;
RUTA, VERONICA
Membro del Collaboration Group
;
Paolo Costantino
Penultimo
Writing – Review & Editing
;
Paola Vittorioso
Ultimo
Supervision
2018

Abstract

Hypocotyl elongation of Arabidopsis seedlings is influenced by light and numerous growth factors. Light induces inhibition of hypocotyl elongation (photomorphogenesis), whereas in the dark hypocotyl elongation is promoted (skotomorphogenesis). Abscisic acid (ABA) plays a major role in inhibition of hypocotyl elongation, but the molecular mechanism remains unclear. We investigated the effect of ABA during photo- and skotomorphogenesis, making use of appropriate mutants, and we show that ABA negatively controls hypocotyl elongation acting on gibberellin (GA) metabolic genes, increasing the amount of the DELLA proteins GAI and RGA thus affecting GA signalling, and (ultimately) repressing auxin biosynthetic genes.
ABA; Arabidopsis; auxin; DELLA proteins; GA; hypocotyl elongation; PIF proteins
01 Pubblicazione su rivista::01a Articolo in rivista
Abscisic acid inhibits hypocotyl elongation acting on gibberellins, DELLA proteins and auxin / Lorrai, Riccardo; Boccaccini, Alessandra; Ruta, Veronica; Marco, Possenti; Costantino, Paolo; Vittorioso, Paola. - In: AOB PLANTS. - ISSN 2041-2851. - 10:5(2018). [10.1093/aobpla/ply061]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1174241
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