Journal
SEXUAL PLANT REPRODUCTION
Volume 23, Issue 1, Pages 63-71Publisher
SPRINGER
DOI: 10.1007/s00497-009-0121-4
Keywords
Pollen grain; Pollen tube; Cell mechanics; Invasive growth; Germination
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Fonds Quebecois de la Recherche sur la Nature et les Technologies (FQRNT)
- Human Frontier Science Program (HFSP)
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Expansive growth in plant cells is a formidable problem for biophysical studies, and the mechanical principles governing the generation of complex cellular geometries are still poorly understood. Pollen, the male gametophyte stage of the flowering plants, is an excellent model system for the investigation of the mechanics of complex growth processes. The initiation of pollen tube growth requires first of all, the spatially confined formation of a protuberance. This process must be controlled by the mechanical properties of the cell wall, since turgor is a non-vectorial force. In the elongating tube, cell wall expansion is confined to the apex of the cell, requiring the tubular region to be stabilized against turgor-induced tensile stress. Tip focused surface expansion must be coordinated with the supply of cell wall material to this region requiring the precise, logistical control of intracellular transport processes. The advantage of such a demanding mechanism is the high efficiency it confers on the pollen tube in leading an invasive way of life.
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