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Conference in French: Active systems and materials in plants
By: Olivier HAMANT

Olivier HAMANT is Research director at INRA in the Plant Reproduction and Development laboratory (ENS Lyon, France), Research associate at the Sainsbury laboratory (Cambridge, UK) and Associate professor at Kumamoto University (Japan)
Date: March 2, 2020
Time: 17:00
Place: Salle Burg, Annexe 2, Institut Curie, 12 rue Lhomond, F-75005 Paris, France

Fundamental Research
2 March 2020 - 2 March 2020
Paris, France

Abstract:
Living systems are physical objects. Unlike developing animals, that are made up of mechanically soft and contractile cells, growing plant tissues are very rigid and highly pressurized. The resulting immobility of plants could lead one to believe that they do not react to mechanical stresses. Results obtained in recent years demonstrate, on the contrary, the very reactive nature of plants, and of the materials constituting them, at all scales. In this seminar, we will focus on the dynamics of cellulose synthesis to highlight the role of forces in plant morphogenesis.

References:
Hamant O, Inoue D, Bouchez D, Dumais J, Mjolsness E (2019) Are microtubules tension sensors? Nat. Com. 10(1):2360.
Verger S, Long Y, Boudaoud A, Hamant O (2018) A tension-adhesion feedback loop in plant epidermis. eLife. 7. pii: e34460.
Hervieux N, Tsugawa S, Fruleux A, Dumond M, Routier-Kierzkowska AL, Komatsuzaki T, Boudaoud A, Larkin JC, Smith RS, Li CB, Hamant 0 (2017) Mechanical Shielding of Rapidly Growing Cells Buffers Growth Heterogeneity and Contributes to Organ Shape Reproducibility. Curr. Biol. 27(22):3468-3479.e4.
Tran D, Galletti R, Neumann ED, Dubois A, Sharif-Naeini R, Geitmann A, Frachisse JM, Hamant O, Ingram GC (2017) A mechanosensitive Ca2+ channel activity is dependent on the developmental regulator DEK1. Nat Com. 8(1):1009.
Louveaux M, Julien JD, Mirabet V, Boudaoud A, Hamant O (2016) Cell division plane orientation based on tensile stress in Arabidopsis thaliana. Proc Natl Acad Sci U S A. 113(30):E4294-303.
Uyttewaal M, Burian A, Alim K, Landrein B, Borowska-Wykręt D, Dedieu A, Peaucelle A, Ludynia M, Traas J, Boudaoud A, Kwiatkowska D, Hamant O (2012) A katanin-dependent microtubule response to mechanical stress enhances growth gradients between neighboring cells in Arabidopsis. Cell 149 (2):439-451.
Hamant O, Heisler MG, Jönsson H, Krupinski P, Uyttewaal M, Bokov P, Corson F, Sahlin P, Boudaoud A, Meyerowitz EM, Couder Y, Traas J (2008) Developmental patterning by mechanical signals in Arabidopsis. Science 322:1650-1655.

Keywords

plants, active systems, cellulose synthesis