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  For the road: calibrated maternal investment in light of extracellular symbiont transmission

Pons, I., González Porras, M., Breitenbach, N., Berger, J., Hipp, K., & Salem, H. (2022). For the road: calibrated maternal investment in light of extracellular symbiont transmission. Proceedings of the Royal Society B: Biological Sciences, 289(1973): 20220386. doi:10.1098/rspb.2022.0386.

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Pons, I1, Autor           
González Porras, MA1, Autor                 
Breitenbach, N1, Autor           
Berger, J2, Autor           
Hipp, K2, Autor           
Salem, H1, Autor           
Affiliations:
1Research Group on Mutualisms, Max Planck Institute for Biology Tübingen, Max Planck Society, ou_3375056              
2Electron Microscopy, Max Planck Institute for Biology Tübingen, Max Planck Society, ou_3374923              

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 Zusammenfassung: Faithful transmission of beneficial symbionts is critical for the persistence of mutualisms. Many insect groups rely on extracellular routes that require microbial symbionts to survive outside the host during transfer. However, given a prolonged aposymbiotic phase in offspring, how do mothers mitigate the risk of symbiont loss due to unsuccessful transmission? Here, we investigated symbiont regulation and reacquisition during extracellular transfer in the tortoise beetle, Chelymorpha alternans (Coleoptera: Cassidinae). Like many cassidines, C. alternans relies on egg caplets to vertically propagate its obligate symbiont Candidatus Stammera capleta. On average, each caplet is supplied with 12 symbiont-bearing spheres where Stammera is embedded. We observe limited deviation (±2.3) in the number of spheres allocated to each caplet, indicating strict maternal control over symbiont supply. Larvae acquire Stammera 1 day prior to eclosion but are unable to do so after hatching, suggesting that a specific developmental window governs symbiont uptake. Experimentally manipulating the number of spheres available to each egg revealed that a single sphere is sufficient to ensure successful colonization by Stammera relative to the 12 typically packaged within a caplet. Collectively, our findings shed light on a tightly regulated symbiont transmission cycle optimized to ensure extracellular transfer.

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 Datum: 2022-04
 Publikationsstatus: Erschienen
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 Ort, Verlag, Ausgabe: -
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 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1098/rspb.2022.0386
PMID: 35473381
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Titel: Proceedings of the Royal Society B: Biological Sciences
  Kurztitel : Proc. R. Soc. B
Genre der Quelle: Zeitschrift
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Affiliations:
Ort, Verlag, Ausgabe: London : Royal Society
Seiten: 9 Band / Heft: 289 (1973) Artikelnummer: 20220386 Start- / Endseite: - Identifikator: ISSN: 0962-8452
CoNE: https://pure.mpg.de/cone/journals/resource/110975500577295_2