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UID:0-1004@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20241213T110000
DTEND;TZID=Europe/Paris:20241213T120000
DTSTAMP:20241212T090157Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/physics-biology-i
 nterface-seminar-laure-mancini-3/
SUMMARY:Physics-Biology Interface seminar: Laure Mancini - Salle des sémin
 aires du FAST et du LPTMS\, bâtiment Pascal n°530 - 13 Déc 24 11:00
DESCRIPTION:Establishment of phyllotaxy from a single cell in the moss Phys
 comitrium Patens\nLaure Mancini (ENS Lyon)\nTalk by the winner of the Phys
 Bio2024 best junior talk competition. The speaker will join us over Zoom\,
  but those interested can join us in the LPTMS seminar room to watch it.\n
 \nThe shape of living organisms follows robust architectural plans that de
 termine the main axis and the relative position of each organ. In plants\,
  organs such as leaves\narrange themselves around the stem with a mathemat
 ical regularity\, forming large-scale patterns like spirals. This organiza
 tion is called phyllotaxis and emerges thanks to the activity of stem cell
 s located at the apical meristem\, which corresponds to the tip of the lea
 fy shoot.\n\nDepending on the group of plant\, the apical meristem can be 
 multi- or unicellular. In the case of the moss Physcomitrium Patens\, thi
 s structure is composed of a single stem cell\, the apical cell (AC)\, whi
 ch is responsible for producing all the leaves. As a result\, the position
  of each new leaf strongly depends on the division pattern of the AC. Howe
 ver\, the mechanisms that control the positioning of the apical cell divis
 ion plane to pattern moss phyllotaxis remain to be discovered.\n\nAs an en
 try point to the problem\, we studied the role of auxin signaling in this 
 context because\, the hormone auxin is known to be instrumental in establi
 shing phyllotactic patterns in multicellular meristems. We asked if this h
 ormone can also act at the scale of a unique stem cell\, to insure a robus
 t phyllotactic pattern. To do so\, we used a combination of quantitative t
 ime-lapse imaging\, genetic tools and mutants as well as cellular shape an
 alysis and modeling. With these approaches\, we found that auxin is involv
 ed in the robustness of the spiral phyllotaxy of the moss and that it affe
 cts cellular properties such as growth anisotropy\, that can impact the gl
 obal architecture of the moss leafy shoot\nJoin Zoom Meeting\nhttps://cnrs
 .zoom.us/j/98437905934?pwd=oCbsaQq6pNbmfxpepR0Nrt2xVsKJXV.1\n\nMeeting ID:
  984 3790 5934\nPasscode: 8191Vt
CATEGORIES:physbio,seminars
LOCATION:Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°53
 0\, rue André Riviere\, Orsay\, 91405\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Riviere\, Orsay\
 , 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Salle des séminaires du FAST 
 et du LPTMS\, bâtiment Pascal n°530:geo:0,0
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DTSTART:20241027T020000
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