Direct studies of dikaryotization in Schizophyllum commune. I. Live inter-cellular nuclear migration patterns

Area of Science:

• Mycology
• Cell Biology
• Molecular Biology

Background:

• Nuclear migration is crucial for fungal development and genetic exchange.
• Understanding the mechanisms of nuclear movement provides insights into cellular dynamics.

Purpose of the Study:

• To investigate and categorize the modes of nuclear migration in Schizophyllum commune.
• To determine the relationship between nuclear movement and hyphal growth rate.

Main Methods:

• Compatible matings of Schizophyllum commune were conducted on a specialized medium.
• Phase contrast microscopy was used to observe nuclear migration during hyphal growth.

Main Results:

• Three distinct types of nuclear migration were identified: Type I (pulsatile cytoplasmic flow), Type II A (rapid movement without visible flow), and Type II B (slower movement without visible flow).
• Type I and Type II A nuclear movements were significantly faster (10-20 fold) than hyphal growth.
• Type II B nuclear migration occurred at a rate comparable to hyphal growth.
• No specific organelles were found to direct or facilitate Type II A or II B nuclear movements.
• The nucleolus could lead or trail the nucleus during migration.

Conclusions:

• Nuclear migration in S. commune is a complex process driven by both cytoplasmic streaming and self-motility.
• The specific mechanism of nuclear migration varies within different regions of the hypha.
• Nuclear movement is not dependent on the observation of specific organelles.