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SUMMARY:Against the grain\; Modeling seed growth control as an mechano-sen
 sitive incoherent feedforward loop. - Olivier Ali
DTSTART:20210301T143000Z
DTEND:20210301T153000Z
UID:TALK154729@talks.cam.ac.uk
CONTACT:98764
DESCRIPTION:Mechanical stresses arising in growing tissues are key regulat
 ors of morphogenesis. This is especially true in plants where the cell wal
 l assembly constitutes the main load-bearing structure. Its mechanical sol
 licitation\, due to internal cell turgor\, triggers two main antagonist re
 sponses: wall stiffening and cell expansion. From asystematic perspective\
 , these two mechanisms constitute an incoherent feedforward loop. Within b
 iochemical regulatory networks\, such motifs may act as oriented triggers 
 or pulse generators. However\,their involvement in mechano-sensitive pathw
 ays is less common and understood. What are the properties of mechano-sens
 itive incoherent feedforward loop (ms-IFFL)? To what extent are plant morp
 hodynamics influenced by them? The simple shape and “russian doll” org
 anization of the Arabidopsis thaliana seed offer unique conditions toaddre
 ss these questions. From quantitative experiments we derived a 1D “toy m
 odel“ to investigate the ms-IFFL properties. This model accounts for see
 d morphodynamics in wild-type and mutant populations and sheds new light o
 n the counter-intuitive role of pressure in growing plant tissues.
LOCATION:Online
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