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SUMMARY:How repeatable is evolution? The genetics of parallel architectura
 l evolution in Brassicaceae - Professor David Baum\, University of Wiscons
 in
DTSTART:20080207T160000Z
DTEND:20080207T170000Z
UID:TALK9397@talks.cam.ac.uk
CONTACT:3901
DESCRIPTION:3rd Kenneth Sporne Lecture\n\nAn outstanding question is the e
 xtent to which independent evolutionary origins of the same morphological 
 trait result from similar changes to genetic and developmental systems.  T
 o explore this question we have been evaluating the role of the floral mer
 istem identity gene LEAFY (LFY) in three lineages of Brassicaceae (Idahoa\
 , Leavenworthia\, and Ionopsidium) that have transitioned from an ancestra
 l inflorescence-flowering architecture to a derived rosette flowering arch
 itecture.  In Ionopsidium LFY shows a distinct expression pattern in roset
 te flowering versus inflorescence flowering species\, and transgenic exper
 iments suggest that this is due to upstream trans-acting regulators.  In I
 dahoa the two LFY genes show anomalous patterns of molecular evolution and
  alter plant architecture when introduced into an inflorescence flowering 
 species\, supporting the hypothesis that changes at the LFY loci contribut
 ed to the evolution of rosette flowering.  In Leavenworthia the single LFY
  gene shows anomalous patterns of molecular evolution and has apparently c
 oevolved with the TERMINAL FLOWER 1 gene to influence plant architecture. 
  Overall these data\,  suggest that even among close relatives there may b
 e several molecular paths to the same evolutionary outcome\, but that thes
 e paths may all impinge the same small number of developmental regulators.
 \n\nhttp://www.botany.wisc.edu/baum/dbaum.htm
LOCATION:Department of Plant Sciences\, Large Lecture Theatre
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