Title
A local maximum in gibberellin levels regulates maize leaf growth by spatial control of cell division A local maximum in gibberellin levels regulates maize leaf growth by spatial control of cell division
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
London ,
Subject
Chemistry
Biology
Human medicine
Source (journal)
Current biology. - London
Volume/pages
22(2012) :13 , p. 1183-1187
ISSN
0960-9822
ISI
000306379600021
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Plant growth rate is largely determined by the transition between the successive phases of cell division and expansion [1]. A key role for hormone signaling in determining this transition was inferred from genetic approaches and transcriptome analysis in the Arabidopsis root tip [2-5]. We used the developmental gradient at the maize leaf base as a model to study this transition, because it allows a direct comparison between endogenous hormone concentrations and the transitions. between dividing, expanding, and mature tissue. Concentrations of auxin and cytokinins are highest in dividing tissues, whereas bioactive gibberellins (GAs) show a peak at the transition zone between the division and expansion zone. Combined metabolic and transcriptomic profiling revealed that this GA maximum is established by GA biosynthesis in the division zone (DZ) and active GA catabolism at the onset of the expansion zone. Mutants defective in GA synthesis and signaling, and transgenic plants overproducing GAs, demonstrate that altering GA levels specifically affects the size of the DZ, resulting in proportional changes in organ growth rates. This work thereby provides a novel molecular mechanism for the regulation of the transition from cell division to expansion that controls organ growth and size.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/a3e38d/5019.pdf
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