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X-ORIGINAL-URL:https://www.lps.u-psud.fr/
X-WR-CALNAME:Laboratoire de physique des Solides
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BEGIN:VEVENT
CLASS:PUBLIC
DTSTART;TZID=Europe/Paris:20241213T110000
DTEND;TZID=Europe/Paris:20241213T230000
DTSTAMP:20241212T074500
UID:MEC-ca7be8306ecc3f5fa30ff2c41e64fa7b@lps.u-psud.fr
CREATED:20241212
LAST-MODIFIED:20241212
PRIORITY:5
TRANSP:OPAQUE
SUMMARY:Séminaire Laure Mancini (ENS Lyon)
DESCRIPTION:\nEstablishment of phyllotaxy from a single cell in the moss PhyscomitriumPatens\n\n\n\nThe shape of living organisms follows robust architectural plans thatdetermine the main axis and the relative position of each organ. Inplants, organs such as leavesarrange themselves around the stem with a mathematical regularity,forming large-scale patterns like spirals. This organization is calledphyllotaxis and emerges thanks to the activity of stem cells located atthe apical meristem, which corresponds to the tip of the leafy shoot.Depending on the group of plant, the apical meristem can be multi- orunicellular. In the case of the moss Physcomitrium Patens, thisstructure is composed of a single stem cell, the apical cell (AC), whichis responsible for producing all the leaves. As a result, the positionof each new leaf strongly depends on the division pattern of the AC.However, the mechanisms that control the positioning of the apical celldivision plane to pattern moss phyllotaxis remain to be discovered.As an entry point to the problem, we studied the role of auxin signalingin this context because, the hormone auxin is known to be instrumentalin establishing phyllotactic patterns in multicellular meristems. Weasked if this hormone can also act at the scale of a unique stem cell,to insure a robust phyllotactic pattern. To do so, we used a combinationof quantitative time-lapse imaging, genetic tools and mutants as well ascellular shape analysis and modeling. With these approaches, we foundthat auxin is involved in the robustness of the spiral phyllotaxy of themoss and that it affects cellular properties such as growth anisotropy,that can impact the global architecture of the moss leafy shoot.\n
URL:https://www.lps.u-psud.fr/events/seminaire-laure-mancini-ens-lyon/
CATEGORIES:Séminaire Matière Molle Phys-Bio
LOCATION:Online
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