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

Joanne Bennett, Amibeth Thompson, Irina Goia, Reinart Feldmann, Valentin Ştefan, Ana Bogdan, Demetra Rakosy, Mirela Beloiu, Inge-Beatrice Biro, Simon Bluemel, Milena Filip, Anna-Maria Madaj, Alina Martin, Sarah Passonneau, Denisa Kalisch, Gwydion Scherer, Tiffany M. Knight

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)
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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.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalAOB Plants
Volume10
Issue number5
DOIs
Publication statusPublished - 2018
Externally publishedYes

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