期刊
MOLECULAR PLANT
卷 6, 期 4, 页码 1037-1052出版社
CELL PRESS
DOI: 10.1093/mp/sst073
关键词
transport processes; kinetics; cell expansion; cytoskeleton dynamics; protein traffic and secretion; pollen development
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Fonds Quebecois de la Recherche sur la Nature et les Technologies (FQRNT)
The growth of the pollen tube implies the transport of building material and proteins over long distances and in a highly targeted manner. The biophysical underpinnings of intracellular transport, including cytoskeleton-mediated active transport and fluid mechanics, are discussed in this review.Cellular organelles move within the cellular volume and the effect of the resulting drag forces on the liquid causes bulk movement in the cytosol. The movement of both organelles and cytosol leads to an overall motion pattern called cytoplasmic streaming or cyclosis. This streaming enables the active and passive transport of molecules and organelles between cellular compartments. Furthermore, the fusion and budding of vesicles with and from the plasma membrane (exo/endocytosis) allow for transport of material between the inside and the outside of the cell. In the pollen tube, cytoplasmic streaming and exo/endocytosis are very active and fulfill several different functions. In this review, we focus on the logistics of intracellular motion and transport processes as well as their biophysical underpinnings. We discuss various modeling attempts that have been performed to understand both long-distance shuttling and short-distance targeting of organelles. We show how the combination of mechanical and mathematical modeling with cell biological approaches has contributed to our understanding of intracellular transport logistics.
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