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SUMMARY:Investigating the secondary loss of auxin signalling components in
  duckweed
DTSTART;VALUE=DATE-TIME:20260929T144500Z
DTEND;VALUE=DATE-TIME:20260929T150000Z
DTSTAMP;VALUE=DATE-TIME:20260915T141927Z
UID:indico-contribution-2904@cern.ch
DESCRIPTION:Speakers: Claire Smith (Plant and Crop Sciences\, School of Bi
 osciences\, University of Nottingham)\nEvolutionary studies mainly focus o
 n the acquisition of new traits in highly diversified plant lineages\, wit
 h comparatively few studies showing how these traits have undergone second
 ary loss. Duckweeds provide a tractable system to address this within angi
 osperms\, as they have gradually lost the ability to grow roots and vascul
 ature. These lost traits are regulated by auxin in other angiosperms. The 
 core auxin signalling network relies on three key protein families: AUXIN 
 RESPONSE FACTORS (ARFs)\, AUXIN/INDOLE-3 ACETIC ACIDS (AUX/IAAs)\, and TRA
 NSPORT INHIBITOR 1/AUXIN SIGNALLING F-BOX (TIR1/AFBs). During the evolutio
 n of land plants there have been expansions in the number of network compo
 nents\, creating a diverse network with high specificity of response. Ther
 e have been many studies on how this network has evolved from algae to ang
 iosperms\, but no research how components have been lost secondarily. We f
 ound that there has been a reduction in the number of components across al
 l duckweeds\, however most subclades have been conserved\, and that a wide
  panel of duckweeds respond to exogenous auxin in growth assays. We found 
 that the rootless *Wolffia australiana* responds transcriptionally to auxi
 n\, although the genes that are induced are distinct from those induced in
  rooted duckweeds. This work shows a correlation between the loss of struc
 tural complexity and reduction of the auxin signalling network\, which is 
 the opposite of what is observed during the evolution of angiosperms. This
  positions duckweeds as a good model for research into secondary loss and 
 provides a minimal system with low levels of genetic redundancy.\n\nhttps:
 //indico.unina.it/event/117/contributions/2904/
LOCATION:Department of Agricultural Sciences of the University of Napoli F
 ederico II\, Portici\, Italy Sala Cinese
URL:https://indico.unina.it/event/117/contributions/2904/
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