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Area of Science:

  • Mycology
  • Fungal Biology
  • Cell Biology

Background:

  • Fungal hyphae exhibit tip growth and cytoplasmic streaming.
  • Woronin bodies regulate cytoplasmic streaming by plugging septal pores.

Purpose of the Study:

  • To determine if apical compartments of Aspergillus niger sustain their own growth.
  • To investigate the role of subapical compartments in fungal hyphal growth and regeneration.

Main Methods:

  • Comparative analysis of wildtype and ΔhexA mutant strains of Aspergillus niger.
  • Dissection of hyphal compartments to assess growth continuity and rate.
  • Observation of branching patterns following apical damage.

Main Results:

  • Apical compartments of Aspergillus niger are self-sustaining and maintain growth rate independently of subapical compartments.
  • Hyphae lacking Woronin bodies (ΔhexA strain) showed reduced growth continuity after compartment dissection.
  • Wildtype subapical compartments formed new branches to support growth after apical damage, unlike the ΔhexA strain.

Conclusions:

  • Apical compartments possess inherent growth capabilities in Aspergillus niger.
  • Woronin bodies and subapical compartments form a crucial backup system for fungal growth and substrate exploration.
  • This backup mechanism is vital for fungal survival in potentially hostile environments.