[Seminars] PSB event reminder

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Calendar Name: seminars
Scheduled for: Thursday, November 24 2011, 11:00 - 12:30
Event text:    Prof Jiri Friml
	       
	       VIB, Dept. of Plant Systems Biology
	       Ghent University
	       
	       Gent
	       BELGIUM
Details:       "How cells make a plant: role for cell polarity and
	       endocytic trafficking"
	       
	       ABSTRACT
	       In plants, more than in other eukaryotes, establishment
	       of cell polarity is one of the major developmental
	       themes. Even fully specified plant cells often retain
	       potential to re-define their polarity which is utilized
	       during organ formation, tissue regeneration and multiple
	       other patterning events. The process of tissue
	       polarization inevitably encompasses de novo
	       specification of individual cell polarities in cells
	       within a polarizing tissue. The connection between
	       cellular polarizing events and macroscopic manifestation
	       of polarity such as specification of different cell
	       types along the axis, depend on an action of the
	       signalling molecule auxin and its intercellular
	       directional movement. Auxin is a prominent intercellular
	       signal in plants and its polar cell-to-cell transport is
	       required for various developmental processes including
	       apical-basal axis formation, organogenesis and tropisms.
	       The prominent molecular components of polar auxin
	       transport are auxin efflux transporters of the PIN
	       family, each with specific polar, subcellular
	       localization, which determines direction of auxin flow.
	       Despite critical importance of polar PIN localisation
	       for plant development, little is known about how it is
	       decided to which side of cell PIN proteins will be
	       (re)targeted. Available data suggest existence of
	       sequence-specific polar targeting signals and cell
	       type-specific determinants. Here we will present
	       cellular mechanisms for cell polarity establishment and
	       maintenance and novel molecular components of
	       apical/basal targeting along with possible general
	       mechanisms of cell polarity in plants. The emerging data
	       provide a conceptual framework explaining some of
	       important mechanisms behind astonishing flexibility and
	       adaptability of plant development.

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