Abscisic acid inhibits hypocotyl elongation acting on gibberellins, DELLA proteins and auxin. Issue 5 (5th October 2018)

• Record Type: Journal Article
• Authors: Lorrai, Riccardo; Boccaccini, Alessandra; Ruta, Veronica; Possenti, Marco; Costantino, Paolo; Vittorioso, Paola
• Is Part Of: AoB plants. Volume 10:Issue 5(2018)
• Publication Date: 2018-10-05
• Subjects: ABA -- Arabidopsis -- auxin -- DELLA proteins -- GA -- hypocotyl elongation -- PIF proteins; Plants -- Periodicals; Botany -- Periodicals; 580.5
• DOI: 10.1093/aobpla/ply061
• Languages: English
• ISSNs: 2041-2851

Abstract

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. Abstract : In this manuscript, we provide a molecular framework for the effect of abscisic acid (ABA) on hypocotyl elongation in Arabidopsis seedlings, independently of light conditions. Our results show that ABA negatively controls hypocotyl elongation by acting on gibberellin (GA) metabolic genes, increasing the amount of the DELLA proteins, thus affecting GA signalling, and (ultimately) repressing auxin biosynthetic genes.