Microfilament orientation constrains vesicle flow and spatial distribution in growing pollen tubes.

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 exocy

SUBMITTER: Kroeger JH 

PROVIDER: S-EPMC2756371 | biostudies-literature | 2009 Oct

REPOSITORIES: biostudies-literature