Bacterial dynamics and exchange in plant-insect interactions.

Area of Science:

• Microbial Ecology
• Insect-Plant Interactions
• Bacteriology

Background:

• Plant and insect microbiomes are increasingly studied, but their exchange dynamics are poorly understood.
• Spittlebug nymphs (Philaenus spumarius) create foam while feeding on plants, potentially facilitating microbial exchange.

Purpose of the Study:

• To investigate bacterial exchange between Philaenus spumarius nymphs and their host plant Coleostephus myconis.
• To characterize the bacterial communities in nymphs, plant stems, and nymph-produced foam.
• To compare culture-dependent and -independent methods for microbial community analysis.

Main Methods:

• Utilized both culture-dependent and metabarcoding (culture-independent) approaches.
• Analyzed bacterial communities in Philaenus spumarius nymphs, Coleostephus myconis stems, and nymphal foam.
• Compared bacterial composition across sample types and identified shared genera.

Main Results:

• Bacterial diversity was higher in stems and foam than in nymphs.
• Stems and foam shared similar bacterial compositions, dominated by Burkholderiaceae and Moraxellaceae (stems) and Rhizobiaceae and Sphingobacteriaceae (foam).
• Nymphs harbored distinct endosymbiotic bacteria (Candidatus Sulcia, Sodalis) but also exchanged genera like Curvibacter, Pseudomonas, and Rhizobium with the plant.

Conclusions:

• Both culture-dependent and -independent methods are valuable for studying microbial communities.
• Significant bacterial exchange occurs between Philaenus spumarius nymphs and Coleostephus myconis stems.
• Further research is needed to understand the functional roles of shared bacteria in this plant-insect system.