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Plasma membrane of Phycomyces: sequential changes in the structure during spore formation

J C Tu, S K Malhotra

    Cytobios
    |January 1, 1978
    PubMed
    Summary

    The plasma membrane of Phycomyces blakeleeanus spores develops unique structures during maturation, differing from sporangiophores. These changes involve new large particles and altered intramembranous particle distribution, reflecting lipid content shifts.

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    Area of Science:

    • * Cell Biology
    • * Mycology
    • * Membrane Biology

    Background:

    • * The plasma membrane of sporangiospores (spores) in Phycomyces blakeleeanus exhibits distinct structural characteristics compared to sporangiophores.
    • * Despite differences, spore plasma membranes originate from the sporangiophore's plasma membrane.

    Purpose of the Study:

    • * To investigate the sequential development and structural changes in the plasma membrane during spore formation and maturation in Phycomyces blakeleeanus.
    • * To characterize novel structural features appearing in the spore plasma membrane during maturation.

    Main Methods:

    • * Sequential development study of spores.
    • * Analysis of plasma membrane structure using freeze-fractured replicas.
    • * Observation of intercalated membranous particles (Imp) distribution and novel large particle formation.

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    Main Results:

    • * Cytoplasmic cleavage in spore initials involves vesicles with reversed membrane curvature, which later fuses to form the spore plasma membrane.
    • * During spore maturation, large particles (30-35 nm) appear on the exoplasmic face (EF) as inward protrusions, increasing with maturity.
    • * Intramembranous particle (Imp) numbers change on fractured faces (EF/PF) during maturation, possibly due to lipid alterations.

    Conclusions:

    • * The plasma membrane of Phycomyces blakeleeanus spores undergoes significant structural modifications during maturation, introducing unique features not found in earlier stages or vegetative structures.
    • * These modifications, including the appearance of large particles and altered Imp distribution, are linked to changes in lipid content and membrane dynamics.
    • * The study elucidates the developmental pathway of spore plasma membranes and highlights specialized structures crucial for spore function.