Measurement of Cytoplasmic Streaming in Chara Corallina by Magnetic Resonance Velocimetry

Abstract

In aquatic plants such as the Characean algae, the force generation that drives cyclosis is localized within the cytoplasm, yet produces fluid flows throughout the vacuole. For this to occur the tonoplast must transmit hydrodynamic shear efficiently. Here, using magnetic resonance velocimetry, we present the first whole-cell measurements of the cross-sectional longitudinal velocity field in Chara corallina and show that it is in quantitative agreement with a recent theoretical analysis of rotational cytoplasmic streaming driven by bidirectional helical forcing in the cytoplasm, with direct shear transmission by the tonoplast.

5 pages, 3 figures

References in corpus (1)

• Vesicle dynamics in elongation flow: Wrinkling instability and bud formation

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• Stochastic Fluid Dynamics Simulations of the Velocity Distribution in Protoplasmic Streaming
• Theoretical model of confined thermoviscous flows for artificial cytoplasmic streaming
• On force balance in Brinkman fluids under confinement