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Spatiotemporal Regulation of Lateral Root Organogenesis in Arabidopsis by Cytokinin

Publication Type:Journal Article
Year of Publication:2012
Authors:Bielach, A, Podlešáková, K, Marhavý, P, Duclercq, J, Cuesta, C, Müller, B, GRUNEWALD, WIM, Tarkowski, P, Benková, E
Journal:The Plant Cell
Volume:24
Issue:10
Date Published:2012
ISBN Number:10404651
Abstract:

The architecture of a plant's root system, established postembryonically, results from both coordinated root growth and lateral root branching. The plant hormones auxin and cytokinin are central endogenous signaling molecules that regulate lateral root organogenesis positively and negatively, respectively. Tight control and mutual balance of their antagonistic activities are particularly important during the early phases of lateral root organogenesis to ensure continuous lateral root initiation (LRI) and proper development of lateral root primordia (LRP). Here, we show that the early phases of lateral root organogenesis, including priming and initiation, take place in root zones with a repressed cytokinin response. Accordingly, ectopic overproduction of cytokinin in the root basal meristem most efficiently inhibits LRI. Enhanced cytokinin responses in pericycle cells between existing LRP might restrict LRI near existing LRP and, when compromised, ectopic LRI occurs. Furthermore, our results demonstrate that young LRP are more sensitive to perturbations in the cytokinin activity than are developmentally more advanced primordia. We hypothesize that the effect of cytokinin on the development of primordia possibly depends on the robustness and stability of the auxin gradient.

URL:http://www.jstor.org/stable/23327034
Short Title:The Plant Cell
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Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith