High resistance to Sacbrood virus disease in Apis cerana (Hymenoptera: Apidae) colonies selected for superior brood viability and hygienic behavior
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Sacbrood virus (SBV) caused significant colony collapse in Korean Apis cerana. Therefore, breeding of resistant bees to counter this viral disease is urgently needed. Considering that hygienic behavior in honey bees confers colony-level resistance against brood diseases, we utilized this trait for selecting A. cerana colonies. In addition, the brood survival rate was evaluated after colonies were SBV-inoculated. Over four selective generations, dead brood removal and brood survivorship in selected colonies were higher than those in the controls, which were not selectively bred for those traits (P < 0.01, 99.3 vs. 89.9% for removal of pin-killed pupae; P < 0.01, 99.0 vs. 63.9% for removal of SBV-killed larvae; and P < 0.01, 70.0 vs. 9.2% for brood survivorship). Following SBV inoculation, selected colonies showed an increase in the number of surviving pupae and adults, whereas control colonies collapsed mostly. Our results confirm the feasibility of selecting SBV-resistant A. cerana.
KeywordsApis cerana bee breeding Sacbrood virus instrumental insemination brood disease
NNV and YSC conceived the study, performed experiments, and analyzed data; NNV wrote the draft and participated in revisions; YSC was involved in writing an early version of the paper; IK schemed and organized the data and revised and finalized the paper. All the authors read and approved the final version of the manuscript.
This study was supported by a research project (grant number PJ014180022019) from the National Institute of Agricultural Sciences, Rural Development Administration, Republic of Korea.
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Conflict of interest
The authors declare that they have no conflict of interest.
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