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Comparative susceptibility and immune responses of Asian and European honey bees to the American foulbrood pathogen, Paenibacillus larvae. 2019

Sasiprapa Krongdang, and Jay D Evans, and Yanping Chen, and Wannapha Mookhploy, and Panuwan Chantawannakul
Bee Protection Laboratory, Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand.

American foulbrood (AFB) disease is caused by Paenibacillus larvae. Currently, this pathogen is widespread in the European honey bee-Apis mellifera. However, little is known about infectivity and pathogenicity of P. larvae in the Asiatic cavity-nesting honey bees, Apis cerana. Moreover, comparative knowledge of P. larvae infectivity and pathogenicity between both honey bee species is scarce. In this study, we examined susceptibility, larval mortality, survival rate and expression of genes encoding antimicrobial peptides (AMPs) including defensin, apidaecin, abaecin, and hymenoptaecin in A. mellifera and A. cerana when infected with P. larvae. Our results showed similar effects of P. larvae on the survival rate and patterns of AMP gene expression in both honey bee species when bee larvae are infected with spores at the median lethal concentration (LC50 ) for A. mellifera. All AMPs of infected bee larvae showed significant upregulation compared with noninfected bee larvae in both honey bee species. However, larvae of A. cerana were more susceptible than A. mellifera when the same larval ages and spore concentration of P. larvae were used. It also appears that A. cerana showed higher levels of AMP expression than A. mellifera. This research provides the first evidence of survival rate, LC50 and immune response profiles of Asian honey bees, A. cerana, when infected by P. larvae in comparison with the European honey bee, A. mellifera.

UI MeSH Term Description Entries
D007814 Larva Wormlike or grublike stage, following the egg in the life cycle of insects, worms, and other metamorphosing animals. Maggots,Tadpoles,Larvae,Maggot,Tadpole
D000070059 Paenibacillus larvae A species of Paenibacillus that causes American Foulbrood, a fatal disease of honeybees (APIS) and honeybee colonies.
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D001516 Bees Insect members of the superfamily Apoidea, found almost everywhere, particularly on flowers. About 3500 species occur in North America. They differ from most WASPS in that their young are fed honey and pollen rather than animal food. Apidae,Apis,Apis mellifera,Apis mellifica,European Honey Bee,Honey Bee Drone,Bee,Bee, European Honey,Drone, Honey Bee,European Honey Bees,Honey Bee Drones,Honey Bee, European
D016908 Gram-Positive Bacterial Infections Infections caused by bacteria that retain the crystal violet stain (positive) when treated by the gram-staining method. Bacterial Infections, Gram-Positive,Infections, Gram-Positive Bacterial,Bacterial Infection, Gram-Positive,Bacterial Infections, Gram Positive,Gram Positive Bacterial Infections,Gram-Positive Bacterial Infection,Infection, Gram-Positive Bacterial,Infections, Gram Positive Bacterial
D023181 Antimicrobial Cationic Peptides Small cationic peptides that are an important component, in most species, of early innate and induced defenses against invading microbes. In animals they are found on mucosal surfaces, within phagocytic granules, and on the surface of the body. They are also found in insects and plants. Among others, this group includes the DEFENSINS, protegrins, tachyplesins, and thionins. They displace DIVALENT CATIONS from phosphate groups of MEMBRANE LIPIDS leading to disruption of the membrane. Cationic Antimicrobial Peptide,Cationic Antimicrobial Peptides,Cationic Host Defense Peptides,Host Defense Peptide,Microbicidal Cationic Proteins,Amphipathic Cationic Antimicrobial Peptides,Host Defense Peptides,Antimicrobial Peptide, Cationic,Antimicrobial Peptides, Cationic,Cationic Peptides, Antimicrobial,Cationic Proteins, Microbicidal,Defense Peptide, Host,Defense Peptides, Host,Peptide, Cationic Antimicrobial,Peptide, Host Defense,Peptides, Antimicrobial Cationic,Peptides, Cationic Antimicrobial,Peptides, Host Defense,Proteins, Microbicidal Cationic

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