Intracellular Burkholderia Symbionts induce extracellular secondary infections; driving diverse host outcomes that vary by genotype and environment.

摘要: Symbiotic associations impact and are impacted by their surrounding ecosystem. The association between Burkholderia bacteria the soil amoeba Dictyostelium discoideum is a tractable model to unravel biology underlying symbiont-endowed phenotypes impacts. Several species stably associate with D. typically reduce host fitness in food-rich environments while increasing food-scarce environments. symbionts themselves inedible hosts but induce co-infections secondary that can serve as food source. Thus, “farmers” carry new environments, providing benefit when scarce. We examined ability of specific genotypes assessed under range co-infection conditions environmental contexts. Although all intracellularly infected Dictyostelium, we found predominantly extracellular, suggesting farming benefits derived from extracellular infection structures. Furthermore, levels linked conditional fitness; B. agricolaris have highest level This study illuminates phenomenon induction across associated exemplifies contextual complexity these associations.