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Dernière mise à jour : Mai 2018

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Institut Sophia Agrobiotech

UMR INRA - Univ. Nice Sophia Antipolis - Cnrs

http://www.paca.inra.fr/institut-sophia-agrobiotech_eng/

Mobilité des zoospores de Phytophthora

Vendredi 15 novembre 11h00 - Sophia Antipolis - Inra PACA - Salle A010

Séminaire scientifique
Dans le cadre de l'animation scientifique de l'Institut Sophia Agrobiotech, l'équipe IPO invite Quang Tran, post-doc UCA qui collabore avec Eric Galiana

Abstract

Phytophthora diseases are dangerous to agriculture and eco-systems due to their pervasive spreading through water. From an infected host, multiple biflagellate fungal microswimmers, called as ‘zoospores’, are released to the environment with high-speed swimming up to 200 µm/s, and attack nearby plants. However, there is still lack of understanding about the swimming mechanism of zoospores and their interactions against chemical gradients and physical obstacles in their surrounding environments. In this study, we first conduct microscopy observations to achieve characteristics of their individual swimming and develop a theoretical model to explain its hydrodynamics resulted from the two diametric flagella. Then, we study their response to ionic gradients and physical obstacles using various microfluidic systems. Our experimental results show that the zoospores react significantly against potassium gradients. High concentration of potassium makes them reduce speed, change swimming patterns and even stop moving. We also find out that the density and arrangement of physical obstacles play a big impact on the swimming and spreading of zoospores. These findings contribute to better understand Phytophthora diseases and the development of disease control.​