Abstract
In-vitro reared drone larvae of several sister queens from an Apis mellifera ligustica and a Buckfast breeding line were infected with Paenibacillus larvae (type strain ATCC 9545) causing American foulbrood (AFB). Although drone larvae were susceptible to AFB and could be infected under in-vitro conditions there were differences within and between lineages. Infection sensitivity was higher in the A. m. ligustica line compared to the Buckfast line. Different infection thresholds were found among sister queens of the A. m. ligustica line suggesting a considerable genetic variance for larval resistance against AFB.
Zusammenfassung
Drohnenlarven von Schwesterköniginnen einer Buckfast und einer Apis mellifera ligustica Brutlinie wurden mit Sporen eines Bakterien-Typstammes von Paenibacillus larvae, dem Erreger der Amerikanischen Faulbrut (AFB), einer schweren Brutkrankheit der Honigbiene, infiziert. Die Sterblichkeit der Larven wurde täglich in nicht-infizierten Kontrollen und der sporenbehandelten Gruppe aufgenommen. Die Larven wurden unter kontrollierten in-vitro Bedingungen aufgezogen, um alle Faktoren auszuschließen, die bekanntermaßen AFB Resistenz auf Kolonieebene beeinflussen (z.B. hygienisches Verhalten, Futterkomponenten). Larven der untersuchten Königinnen der Buckfastlinie waren bei den untersuchten Sporendosen weniger anfällig als Nachkommen der Apis mellifera ligustica Linie (Abb. 1). Dies zeigt, dass in verschiedenen Honigbienenlinien unterschiedliche Resistenzniveaus existieren. Wir können allerdings nicht sagen, ob die gefundenen Resistenzniveaus repräsentativ für alle Buckfast bzw. Apis mellifera ligustica Linien sind und ob sie auch konsistent für andere Bakterienstämme wären. Innerhalb der A. m. ligustica Linie fanden wir eine Varianz für Infektionsgrenzwerte (Abb. 2). Dies zeigt, dass diese Grenzwerte auch genetisch beeinflusst sein können. Zusätzlich wurde eine Methode entwickelt, um Varianz in larvaler Resistenz gegen AFB zu bestimmen, unter Benutzung haploider Drohnenlarven.
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Behrens, D., Forsgren, E., Fries, I. et al. Infection of drone larvae (Apis mellifera) with American foulbrood. Apidologie 38, 281–288 (2007). https://doi.org/10.1051/apido:2007009
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DOI: https://doi.org/10.1051/apido:2007009