Growth inhibition and recovery in freeze-substitutedLilium longiflorum pollen tubes: structural effects of caffeine View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1997-03

AUTHORS

S. A. Lancelle, M. Cresti, P. K. Hepler

ABSTRACT

In an attempt to correlate structural effects with the known dissipation of the tip-focused Ca2+ gradient caused by caffeine, we have examined the ultrastructure of caffeine-treated lily pollen tubes prepared by rapid freeze fixation and freeze substitution. We show that treatment with caffeine results in a rapid rearrangement of secretory vesicles at the pollen tube tip; the normal cone-shaped array of vesicles is rapidly dispersed. In addition, microfilament bundles appear in the tip region, where they had previously been excluded. Delocalized vesicle fusion continues in the presence of caffeine but tube extension ceases. Removal of caffeine from the growth medium initially causes tip swelling, delocalized vesicle fusion and presence of microfilaments well into the tip before normal structure and growth resume, concurrent with the previously reported return to a normal Ca2+ gradient. More... »

PAGES

21-33

References to SciGraph publications

  • 1995-09. Effects of heavy metals on pollen tube growth and ultrastructure in PROTOPLASMA
  • 1983-02. Evidence for the role of Ca2+ ions in tip extension in pollen tubes in PROTOPLASMA
  • 1987-06. Ca2+-induced fragmentation of actin filaments in pollen tubes in PROTOPLASMA
  • 1985-01. The effects of ruthenium red, lanthanum, fluorescein isothiocyanate and trifluoperazine on vesicle transport, vesicle fusion and tip extension in pollen tubes in PLANTA
  • 1979-01. Calcium ionophore A 23187 affects localized wall secretion in the tip region of pollen tubes of Lilium longiflorum in PLANTA
  • 1996-09. Effect of caffeine on cytosolic Ca2+ level and cytoplasmic streaming inNitella axilliformis in PROTOPLASMA
  • 1982-12. Disoriented growth of pollen tubes of Lilium longiflorum Thunb. induced by prolonged treatment with the calcium-chelating antibiotic, chlorotetracycline in PLANTA
  • 1986-02. Development and cell surface of a non-syncytial invasive tapetum inCanna: Ultrastructural, freeze-substitution, cytochemical and immunofluorescence study in PROTOPLASMA
  • 1990-02. Caffeine inhibition of cytokinesis: Ultrastructure of cell plate formation/degradation in PROTOPLASMA
  • 1986-06. A method for rapid freeze fixation of plant cells in PROTOPLASMA
  • 1996-03. Actin microfilaments do not form a dense meshwork inLilium longiflorum pollen tube tips in PROTOPLASMA
  • 1992-12. Ultrastructure of freeze-substituted pollen tubes ofLilium longiflorum in PROTOPLASMA
  • 1996-03. Caffeine inhibits cell plate formation by disrupting membrane reorganization just after the vesicle fusion step in PROTOPLASMA
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/bf01281055

    DOI

    http://dx.doi.org/10.1007/bf01281055

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1005131307


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