Olive Fruit Fly Symbiont Population: Impact of Metamorphosis

Area of Science:

• Microbiology
• Entomology
• Symbiosis Research

Background:

• The olive fruit fly is a major pest of olive trees.
• Pest management strategies are evolving with a focus on symbiotic relationships.
• The obligate bacterial symbiont, Candidatus Erwinia dacicola, is crucial for olive fruit fly larval development.

Purpose of the Study:

• To investigate the microbial community of the olive fruit fly across different life stages.
• To identify bacterial symbionts and commensals persisting through metamorphosis.
• To explore novel symbiosis-based pest management approaches.

Main Methods:

• 16S rRNA gene metabarcoding was employed to analyze the olive fruit fly microbiota.
• Samples were collected from three distinct developmental stages: last instar larvae, pupae, and adults.
• Quantitative analysis tracked changes in symbiont abundance during metamorphosis.

Main Results:

• Candidatus Erwinia dacicola abundance significantly changes during olive fruit fly metamorphosis.
• Beyond the primary symbiont, 13 other operational taxonomic units (in 9 genera/species) were identified as persistent members of the olive fruit fly microbiota.
• These persistent bacteria include Corynebacterium sp., Delftia sp., Enhydrobacter sp., Kocuria sp., Micrococcus sp., Propionibacterium sp., Pseudomonas sp., Raoultella sp., and Staphylococcus sp.

Conclusions:

• The olive fruit fly harbors a complex and persistent microbiota beyond its obligate symbiont.
• Significant shifts in Candidatus Erwinia dacicola populations occur during host metamorphosis.
• These findings provide a foundation for developing innovative, symbiosis-based strategies for olive fruit fly pest management.