ArticleCommunications biology2025
Galleria mellonella possesses the essential nutritional needs to host the fastidious Huanglongbing bacterial pathogen 'Candidatus Liberibacter asiaticus'.
Article in Communications biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Citrus greening disease, caused by 'Candidatus Liberibacter asiaticus', severely impacts citrus production worldwide. The development of sustainable control strategies for this disease is restricted by the unavailability of the bacterium in pure culture. Herein, the metabolic profile of the waxworm larvae, Galleria mellonella, was compared to that of Diaphorina citri, the vector of 'Ca. L. asiaticus'. Our findings showed that G. mellonella larvae possess the nutritional needs to host 'Ca. L. asiaticus', supporting its short-term persistence, and responds to infection with a visible immune reaction by producing melanin upon bacterial invasion. The inoculated larvae exhibit detectable bacterial titers for up to four days when inoculated with infected citrus phloem sap or D. citri haemolymph, after which bacterial titers decline, and infected larvae show reduced survival compared to mock-treated and 'Ca. L. asiaticus'-free controls. Metabolic profiling of G. mellonella, D. citri, and honeybees (Apis mellifera) reveals distinct chemical compositions in their haemolymph. G. mellonella contains higher levels of amino acids, organic acids, nucleotides, and sugar-nucleotides, providing essential nutrients for 'Ca. L. asiaticus', while D. citri is enriched in monosaccharides and sugar-alcohols. Citric acid was detected exclusively in the haemolymph of G. mellonella. These findings suggest G. mellonella as a convenient model that can transiently host 'Ca. L. asiaticus' for short-term use, which would facilitate high-throughput screening of antimicrobial compounds against 'Ca. L. asiaticus', as well as exploring host-pathogen interactions. This model could accelerate the development of effective treatments against citrus greening and inform broader strategies for managing vector-borne plant diseases.
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