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Calendar Name: seminars
Scheduled for: Monday, December 7 2009, 11:00 - 12:30
Event text:    Prof Cris Kuhlemeier
	       
	       Institute of Plant Sicences
	       University of Bern
	       
	       Bern 
	       Switzerland
Details:       “Auxin and Phyllotaxis”
	       
	       ABSTRACT
	       Phyllotaxis, the regular arrangement of leaves or
	       flowers around a plant stem, is an example of
	       developmental pattern formation and organogenesis.
	       Phyllotaxis is characterized by the divergence angles
	       between the organs, the most common angle being 137.5°,
	       the golden angle. Models of phyllotaxis must explain its
	       de novo establishment in the radially symmetric embryo,
	       the stable maintenance of the different arrangements and
	       the observed transitions between phyllotactic patterns.
	       Most importantly, they must explain the specific
	       divergence angles of 180°, 90°, 137.5° and in rarer
	       cases other angles as well.  
	       This quantitative aspect makes phyllotaxis an unusual
	       developmental problem. It has traditionally attracted
	       the interest of mathematicians and computer scientists,
	       who have constructed a wide variety of simulation
	       models.	To the biologist it is surprising that only
	       minimal assumptions about the underlying molecular
	       mechanisms are sufficient to arrive at mathematical
	       models that correctly and robustly recreate phyllotactic
	       patterns. In this presentation I will give an overview
	       of the experimental work on phyllotaxis and how these
	       experiments form the basis for a new generation of
	       simulation models. The interplay between modeling and
	       experiment will be discussed.
	       
	       Kuhlemeier, C., Phyllotaxis. Trends Plant Sci., 2007.
	       12: p. 143-150.

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