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      Microfilament Orientation Constrains Vesicle Flow and Spatial Distribution in Growing Pollen Tubes

      , , ,
      Biophysical Journal
      Elsevier BV

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          Abstract

          The dynamics of cellular organelles reveals important information about their functioning. The spatio-temporal movement patterns of vesicles in growing pollen tubes are controlled by the actin cytoskeleton. Vesicle flow is crucial for morphogenesis in these cells as it ensures targeted delivery of cell wall polysaccharides. Remarkably, the target region does not contain much filamentous actin. We model the vesicular trafficking in this area using as boundary conditions the expanding cell wall and the actin array forming the apical actin fringe. The shape of the fringe was obtained by imposing a steady state and constant polymerization rate of the actin filaments. Letting vesicle flux into and out of the apical region be determined by the orientation of the actin microfilaments and by exocytosis was sufficient to generate a flux that corresponds in magnitude and orientation to that observed experimentally. This model explains how the cytoplasmic streaming pattern in the apical region of the pollen tube can be generated without the presence of actin microfilaments.

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          Author and article information

          Journal
          Biophysical Journal
          Biophysical Journal
          Elsevier BV
          00063495
          October 2009
          October 2009
          : 97
          : 7
          : 1822-1831
          Article
          10.1016/j.bpj.2009.07.038
          2756371
          19804712
          1206cf0a-b96f-44c0-ba5e-789a9df2c792
          © 2009

          https://www.elsevier.com/tdm/userlicense/1.0/

          https://www.elsevier.com/open-access/userlicense/1.0/

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