A possible baculovirus in the insect-parasitic fungus, Strongwellsea magna

Area of Science:

• Mycology
• Virology
• Insect Pathology

Background:

• Insect-parasitic fungi, such as Strongwellsea magna, play a role in regulating insect populations.
• Baculoviruses are a genus of insect viruses known for their distinct virion structure and host specificity.
• The presence of novel viral particles within fungal pathogens can indicate complex host-pathogen interactions.

Purpose of the Study:

• To investigate the nature of particles observed within the hyphae of Strongwellsea magna.
• To determine if these particles exhibit characteristics consistent with known viral families, specifically baculoviruses.
• To explore the potential implications of these findings for understanding fungal-entomopathogen interactions.

Main Methods:

• Microscopic examination of hyphae from Strongwellsea magna infecting Fannia canicularis.
• Ultrastructural analysis of the observed particles, including size, core, and envelope characteristics.
• Comparison of particle morphology and apparent morphogenesis with established baculovirus virion structures.

Main Results:

• Large numbers of baculovirus-like particles were identified within the hyphae of Strongwellsea magna.
• The particles measured approximately 100 x 390 nm, featuring a dense core (50 x 340 nm) and a less dense envelope.
• Evidence suggested that the particle envelope was contiguous with vesicles derived from the hyphal plasma membrane, indicating potential morphogenesis pathways.

Conclusions:

• The observed particles share significant structural similarities with virions of the invertebrate baculoviruses.
• The findings suggest that Strongwellsea magna may be infected by a baculovirus, representing a potential co-infection or a novel viral association.
• Further research is warranted to confirm the viral identity and understand the biological significance of these particles within the fungal-entomopathogen system.