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Updated: Jun 6, 2026

Preparation of Virus-Enriched Inoculum for Oral Infection of Honey Bees (Apis mellifera)
Published on: August 26, 2020
[Characteristics of three spiroplasma isolates from honeybee (Apis mellifera)]
Lijing Hui1, Zhiping Zhong, Bing Hu
1Key Laboratory of Microbiological Engineering of Agricultural Environment, Ministry of Agriculture, Nanjing Agricultural University, Nanjing 210095, China. huilijing@126.com
Objective:
To investigate the kinds and characteristics of spiroplasma in honeybees, as well as to study the taxonomy and transmission of honeybee spiroplasma under natural conditions.
Methods:
We examined the morphology of spiroplasma isolates by dark field and transmission electron microscopy and studied the biological characteristics by using conventional culture-dependent methods and molecular biology and serological methods.
Results:
Three spiroplasma isolates were obtained from healthy Apis mellifera. All isolates exhibited helicity during their growth phase, with one isolate (MF0905) being shorter and having less helicity. This isolate also differed from the other two (MF0903 and MF0904) in having larger colonies with an irregular margin instead of being round. In addition, isolate MF0905 could not hydrolyze arginine whereas MF0903 and MF0904 could. All three isolates could use glucose and D-fructose as a carbon source but did not hydrolyse urea. Phylogenetic analysis based on the 16S rDNA, ITS and the rpoB gene showed that MF0903 and MF0904 had a close relationship with Spiroplasma melliferum, and MF0905 was close to S. clarkii. Serological studies including the growth inhibition test, metabolic inhibition test and deformation test gave the same result as the phylogenetic analysis.
Conclusion:
The spiroplasma isolate MF0905 might be S. clarkii and other two isolates were S. melliferum. This result indicated that Spiroplasma melliferum is not the only spiroplasma species in honeybees in China.
Insights
This study identified two Spiroplasma species in honeybees: Spiroplasma melliferum and Spiroplasma clarkii. These findings reveal greater Spiroplasma diversity in honeybees than previously known.
Area of Science:
- Microbiology
- Insect Pathology
- Bacterial Taxonomy
Context:
- Honeybees (Apis mellifera) are crucial pollinators facing various health challenges.
- Spiroplasma are helical bacteria that can infect insects, including honeybees.
- Understanding honeybee Spiroplasma is vital for bee health and colony management.
Purpose:
- To characterize Spiroplasma species found in Chinese honeybees.
- To determine the taxonomic classification and transmission dynamics of these Spiroplasma under natural conditions.
Summary:
- Three Spiroplasma isolates were obtained from healthy honeybees.
- Morphological, biochemical, phylogenetic (16S rDNA, ITS, rpoB), and serological analyses were performed.
- Two isolates were identified as Spiroplasma melliferum, and one as Spiroplasma clarkii.
Impact:
- This research expands the known diversity of Spiroplasma in honeybees, identifying S. clarkii alongside S. melliferum.
- The findings contribute to a better understanding of honeybee microbial communities and potential pathogens.
- This knowledge can inform future strategies for monitoring and managing honeybee health.
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