The hormonal regulation of de-etiolation.
De-etiolation involves a number of phenotypic changes as the plants shift from a dark-grown (etiolated) to a light-grown (de-etiolated) morphology. Whilst these light-induced, morphological changes are thought to be mediated by plant hormones, the precise mechanism/s are not yet fully understood. Here we provide further direct evidence that gibberellins (GAs) may play an important role in de-etiolation, because a similar light-induced reduction in bioactive GA levels was detected in barley (Hordeum vulgare L.), Arabidopsis (Arabidopsis thaliana L.), and pea (Pisum sativum L.). This is indicative of a highly conserved, negative-regulatory role for GAs in de-etiolation, in a range of taxonomically diverse species. In contrast, we found no direct evidence of a reduction in brassinosteroid (BR) levels during de-etiolation in any of these species.
Symons
Gregory M
GM
School of Plant Science, University of Tasmania, Hobart, Tasmania, Australia. g_symons@utas.edu.au
Smith
Jennifer J
JJ
Nomura
Takahito
T
Davies
Noel W
NW
Yokota
Takao
T
Reid
James B
JB
D017360:Arabidopsis / Q000254:growth & development / Q000378:metabolism / Q000528:radiation effects; D005875:Gibberellins / Q000378:metabolism; D001467:Hordeum / Q000254:growth & development / Q000378:metabolism / Q000528:radiation effects; D008027:Light; D018532:Pisum sativum / Q000254:growth & development / Q000378:metabolism / Q000528:radiation effects; D010937:Plant Growth Regulators / Q000378:metabolism* / Q000502:physiology; D036226:Seedlings / Q000254:growth & development / Q000378:metabolism / Q000528:radiation effects; D013260:Steroids, Heterocyclic / Q000378:metabolism
D005875:Gibberellins; D010937:Plant Growth Regulators; D013260:Steroids, Heterocyclic