[Seminars] PSB event reminder
contact at psb.vib-ugent.be
contact at psb.vib-ugent.be
Tue Sep 20 11:10:02 CEST 2011
Calendar Name: seminars
Scheduled for: Thursday, September 22 2011, 11:00 - 12:30
Event text: Prof Tom Beeckman
VIB, Dept. of Plant Systems Biology
Ghent University
Gent
BELGIUM
Details: "Root branching controlled by the tips"
ABSTRACT
In the root, branching, i.e. de novo organogenesis or
formation of lateral roots, is known to occur outside
the apical meristem in a distinct monolayer of cells,
designated as the pericycle. Not every pericycle cell
becomes implicated into lateral root formation and it
has been proposed that an auxin-dependent signaling
mechanism will result in the specification of some cells
as founder cells. Founder cell specification is not a
continuous process but presents an oscillatory
appearance that is proposed to be determinative for the
longitudinal spacing of lateral roots along the primary
root. However, the molecular mechanisms driving the
periodical specification of founder cells remain largely
elusive. Through a targeted transcript profiling
approach, the Root Development group in Gent (Belgium)
has obtained new insights into this very early step of
lateral root formation. Our results support a hypothesis
in which multiple tissue-specific successive auxin
signaling modules are involved during the entire process
of lateral root formation. The earliest auxin signaling
module is situated in the root apex in proximity of the
root apical meristem. Furthermore, a chemical compound
screening unmasked the importance of precursor-to-auxin
conversion activities in the very root tip. In summary,
the root tip is a crucial activity centre that has a
decisive role on the way roots colonize the surrounding
soil.
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