Ascosphaera apis

About the Project

Image of Ascosphaera apis
P.I.: George Weinstock (BCM-HGSC)
Collaborators: Katherine Aronstein (USDA, Subtropical Agricultural Research Center)
Funding: USDA/ARS
Genome size: estimated 24 Mbp
Strain: 0.5-1A and A10

Current Status of the Project

Latest assembly date: 6-01-2006
Total number of reads: 256,859
Coverage: 4x
Number of contigs: 8,092
N50 contig size: 2,967 bp
Number of scaffolds: 1,627
N50 scaffold size: 44,063 bp

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Ascosphaera apis is the fungal cause of the honey bee (Apis mellifera) larval disease chalkbrood. Spores of this fungus germinate within the digestive tract of bees, then begin mycelial growth during the last instar of larval development. Dead larval and pupal bees appear chalky thanks to growth throughout the bee of mycelia. These chalky 'mummies' are highly infectious, and spores of this fungus often reinfect colonies via stored food supplies or direct transport to younger larvae by adult bees working within the nest. Adult bees reduce the effects of this fungus on the colony by frequently identifying and removing diseased individuals. The disease is associated with high brood density (productivity) and cooler outside temperatures.

References for Ascosphaera apis and chalkbrood

Anderson DL, Gibbs AJ, and Gibson NL. 1998. Indentification and phylogeny of spore-cyst fungi (Ascosphaera spp.) using ribosomal DNA sequences. Mycol. Res. 102(5):541-547.

Qin H, Welker DL, Youssef NN. 1993. Isolation and characterization of a linear plasmid from the entomopathogenic fungus Ascosphaera apis. Plasmid. 29(1):19-30.

Williams DL. 2000. A Veterinary Approach to the European Honey Bee (Apis mellifera). The Veterinary Journal. 160:61?7.

Michael Hornitzky. 2001. Literature review of chalkbrood?a fungal disease of honeybees.(Rural Industries Research and Development Corporation).