[Seminars] PSB event reminder

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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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