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Using plusTipTracker Software to Measure Microtubule Dynamics in Xenopus laevis Growth Cones
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Using plusTipTracker Software to Measure Microtubule Dynamics in Xenopus laevis Growth Cones

Published on: September 7, 2014

Not-so-tip-growth.

Anja Geitmann1, Jacques Dumais

  • 1Institut de Recherche en Biologie Végétale, Département de Sciences Biologiques, Université de Montréal, Montréal, Québec, Canada. anja.geitmann@umontreal.ca

Plant Signaling & Behavior
|August 4, 2009
PubMed
Summary
This summary is machine-generated.

Plant cell tip growth occurs in an annular region, not the apex. Vesicle exocytosis, crucial for cell wall expansion, is localized to this area, challenging previous assumptions.

Keywords:
allometric growthcell mechanicscell wallcytomechanicsexocytosisexpansionplant cell growthpollen tuberoot hairtip growthvesicle transport

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Area of Science:

  • Plant Biology
  • Cell Biology
  • Biophysics

Background:

  • Tip-growing plant cells, like pollen tubes and root hairs, expand at their apex.
  • Vesicles carrying pectic cell wall materials are transported to the apical region for cell wall construction.

Discussion:

  • Surface expansion rates are highest in an annular region around the pole, not at the extreme tip.
  • This observation necessitates a re-evaluation of the precise localization of exocytosis events in these cells.

Key Insights:

  • Spatio-temporal image correlation spectroscopy (STICS) and high-resolution confocal imaging revealed vesicle movement dynamics.
  • Fluorescence recovery after photobleaching (FRAP) experiments support the localization of exocytosis.
  • Exocytosis predominantly occurs in the annular region where cell wall expansion rates are maximal.

Outlook:

  • Tip growth in plant cells is a complex process not solely confined to the apical pole.
  • Further research can elucidate the regulatory mechanisms governing exocytosis in the annular region.
  • Understanding this localized growth mechanism can have implications for agricultural and biotechnological applications.