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Startseite > Séminaires > Séminaires 2022 > MSC Seminar. December 5th 2022 at 11:30. David Pereira (MSC, UPC) : "Effect of the mechanical environment on the growth of root hair cells" .

MSC Seminar. December 5th 2022 at 11:30. David Pereira (MSC, UPC) : "Effect of the mechanical environment on the growth of root hair cells"

Sauf mention contraire, les séminaires et les soutenances se déroulent à 11h30 en salle 454A du bâtiment Condorcet.


There will be a live diffusion with Zoom :

Monday December 5th, 11h30 in room 454 A.

Please contact Michael Berhanu or Jean-Baptiste Manneville to attend the visio-seminar.

Effect of the mechanical environment on the growth of root hair cells

David Pereira

Matière et Systèmes Complexes

Université Paris Cité

Abstract : Root hair (RH) cells are important for the growth and survival of seedlings. They especially favor plant-microbe interactions, nutrients, and water uptake. RH cells increase drastically the surface of exchange of the root system with the surrounding environment. To be able to invade the soil, RH cells have to penetrate a dense and porous media exhibiting a variety of physical properties. The soil’s physical properties, such as mechanical resistance, impact the growth and survival of plants. Consequently, studying the effect of soil resistance on the growth of RH is essential to improve our mechanistic understanding of plant growth. This study investigates the effect of the mechanical resistance of the surrounding environment on RH-physical and phenotypical parameters such as length, time, and speed of growth. We also analyzed the impact of the environment on the positioning, speed, and movement of their nucleus. To do so, we used a custom-made microfluidic-like system, Arabidopsis Thaliana seedlings, and different concentrations of solid media (with agar concentrations ranging from 0.5% to 1.25%). Interestingly, we show that the time of growth of RH cells is independent of the mechanical resistance of the surrounding environment. In contrast, the speed of growth is impaired. The RH speed decreases when the mechanical resistance increases. As a consequence, the RH cells are shorter in stiffer environments. Moreover, by extracting the physical parameters of the nucleus we show that the speed of the nucleus adapts to the mechanical resistance of the environment and follows the same trend as the average speed of the RH tip. Our results show that RH cells speed is highly responsive to the resistance of the surrounding environment, however, the time of growth is a regulated parameter of the system, independent of the rigidity. In addition, we also show that rigidity impacts the dynamics of the nucleus. Altogether, these results highlight the mechanosensitivity of the nucleus of RH cells.


Contact : Équipe séminaires / Seminar team - Published on / Publié le 29 novembre 2022


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