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Role of primary symbionts on alarm pheromone production and relation with proteome patterns of aphid with or without symbiotic bacteria

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Academic year: 2021

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Role of primary symbiontes on alarm pheromone production and protein

expression in aphids

François J. Verheggen, Frédéric Francis and Eric Haubruge

Department of functional and evolutionary Entomology, Gembloux Agricultural University, Gembloux B-5030, Belgium

Email : verheggen.f@fsagx.ac.be

Most aphids species harbour obligate endosymbiotic bacteria (also called “primary symbiontes”), named Buchnera aphidicola, in the cytoplasm of bacteriocytes. They provide their host with essential amino acids that are lacking in the phloem of their host plant and are therefore essential for aphid survival and reproduction. Aposymbiotic aphids are aphids lacking viable bacterial symbionts. They are usually obtained by experimental methods, the preferred consisting in an antibiotic treatment administrated via an artificial diet. In the present study, we investigated the role of Buchnera symbiontes on Myzus persicae alarm pheromone production and protein expression. Aposymbiotic aphids were obtained by administrating rifampicine incorporated in artificial diet for seven days. Adults were crushed and their content in (E)-beta-farnesene was analyzed using a push-and-pull volatile collection system, followed by quantification with GC-FID. Alarm pheromone production was significantly reduced in aposymbiotic aphids. These preliminary results suggest additional roles of primary symbiontes on aphid chemical ecology.

Keywords : Symbionte, Buchnera, aphid alarm pheromone, (E)-beta-farnesene, proteomic approach

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