Pollen Tube-- the model system for the study of cell polaritycontrol and tip growth
Pollen Tube - the model system for the study of cell polarity control and tip growth
Introduction. Following germination on the surface ofthe stigma, pollen tubes are directedthrough the stigma surface, grow withinthe transmitting track, emerge from thetransmitting tract and finally are targetedtoward the micropyle to deliver sperms tothe ovule
Introduction • Following germination on the surface of the stigma, pollen tubes are directed through the stigma surface, grow within the transmitting track, emerge from the transmitting tract and finally are targeted toward the micropyle to deliver sperms to the ovule
Introduction Pollen tubes provide a simple modelsystem for studying cell growth and cellpolarity control. Pollen tubes extend exclusively at the cellapex via an extreme form of polar growth.known as tip growth, producing uniformlyshaped cylindrical cells
Introduction • Pollen tubes provide a simple model system for studying cell growth and cell polarity control. • Pollen tubes extend exclusively at the cell apex via an extreme form of polar growth, known as tip growth, producing uniformly shaped cylindrical cells
Introduction Pollen tube growth requiresspatiotemporal regulation of many cellularfunctions,-- ion fluxes, organization and dynamics ofcytoskeletal elements, vesicular traffickingexocytosis, endocytosis, and wallsynthesis, assembly and remodelling
Introduction • Pollen tube growth requires spatiotemporal regulation of many cellular functions, - ion fluxes, organization and dynamics of cytoskeletal elements, vesicular trafficking, exocytosis, endocytosis, and wall synthesis, assembly and remodelling
Introduction: An important issue: tip growth domain (PMdomain) which leads to localized extensionof the plasma membrane and cell walls.Both internal signals and externalguidance signals may regulate the tipgrowth
Introduction • An important issue: tip growth domain (PM domain) which leads to localized extension of the plasma membrane and cell walls. • Both internal signals and external guidance signals may regulate the tip growth