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

Published on Oct 5, 2018in Aob Plants2.182
· DOI :10.1093/AOBPLA/PLY061
Riccardo Lorrai6
Estimated H-index: 6
(Sapienza University of Rome),
Alessandra Boccaccini7
Estimated H-index: 7
(Sapienza University of Rome)
+ 3 AuthorsPaola Vittorioso13
Estimated H-index: 13
(Sapienza University of Rome)
: 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.
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