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SUMMARY:Understanding how flowering plants build communication devices on 
 their petals  - Lucie Riglet\, Sainsbury's Laboratory\, Cambridge Universi
 ty
DTSTART:20221121T143000Z
DTEND:20221121T153000Z
UID:TALK183122@talks.cam.ac.uk
CONTACT:Elena Scarpa
DESCRIPTION:The colourful patterns on the corolla of flowering plants are 
 key signals to attract pollinators\, contributing to plant reproductive su
 ccess and diversification. Hibiscus trionum flowers display a striking bul
 lseye pattern on their petal\, emerging from the combination of a basal pu
 rple spot made of flat\, elongated\, striated cells\, with a white distal 
 region of conical and smooth cells. Both regions are separated by a bounda
 ry positioned at 1/3rd from the petal base. How is this boundary specified
  during development and how its position can vary during evolution to chan
 ge pattern proportions is not understood. \n\nWe developed a quantitative 
 imaging pipeline to start deciphering the mechanisms that specify the dist
 inct regions of the bullseye in developing petals. Using this pipeline\, w
 e captured early cellular behaviour in H. trionum petal epidermis and show
 ed that growth and division are not uniform and follow a pre-pattern long 
 before any sign of the bullseye become visible. To probe the mechanisms ac
 counting for a change in bullseye dimensions\, we characterised natural va
 riants/transgenic lines that differ in bullseye size and tested whether bu
 mblebees can distinguish and/or prefer specific proportions. 
LOCATION:Online
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