Induced hybrid sterility by injection of streptococcal L-forms into <i>Drosophila paulistorum</i>: dynamics of infection

Somerson, Norman L.; Kocka, John P.

doi:10.1139/z90-254

Cited by 5 publications

(1 citation statement)

References 9 publications

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“…The streptococcal L-form derived from testes of D. paulistorum (Mesitas, Andean semispecies) are seen in culture in plate V. Data equivalent to those produced in this study and presented in the tables have been generated by injecting samples of the cultured streptococcal L-forms depicted in plate V; the results of such experiments show an overwhelming preponderance of sterile sons (Somerson et al 1984a,b;Ehrman et al 1987Ehrman et al , 1989.…”

Section: Resultsmentioning

confidence: 71%

The Drosophila paulistorum Endosymbiont in an Alternative Species

Factor¹,

Somerson²,

Manzo³

1989

The American Naturalist

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The Drosophila paulistorum species complex consists of six known apparently separate semispecies: Amazonian, Andean, Centroamerican, Interior, Orinocan, and Transitional. They are the intracellular cytoplasmic bearers of an L-form (cellwall-deficient) microorganism belonging to the genus Streptococcus. (For full histories of the D. paulistorum semispecies, see Ehrman and Powell 1982;Ehrman et al. 1987. For the bacteriology of the streptococcal L-form, see Somerson et al. 1984b.) Drosophila pavlovskiana, in contrast, is a Neotropical endemic (its history is described in Ehrman and Powell 1982, table C, pp. 195, 197). It is also a sibling species of D. paulistorum and crossable with it, albeit with difficulty because of sexual isolation. Furthermore, the F1 hybrid sons are sterile, a common occurrence when semispecies or sibling species of these drosophilids are crossed and succeed in producing progeny.

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Section: Resultsmentioning

confidence: 71%

The Drosophila paulistorum Endosymbiont in an Alternative Species

Factor¹,

Somerson²,

Manzo³

1989

The American Naturalist

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Chapter 1 Bacterial L‐Forms

Allan

Hoischen

Gumpert

2009

Advances in Applied Microbiology

126

157

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Evolutionary ecology of vertically transmitted parasites: transovarial transmission of a microsporidian sex ratio distorter inGammarus duebeni

et al. 1995

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SUMMARYVertically transmitted parasites are transmitted from generation to generation of hosts usually via the host's gametes. Owing to gamete size dimorphism, the major transmission route is transovarial and selection (on the parasite) favours strategies which increase the relative frequency of the transmitting (female) host sex. These strategies impose unusual selection pressures on the host, and coevolution between hosts and vertically transmitted parasites has been implicated in speciation, in the evolution of symbiosis, and in the evolution of novel systems of host reproduction and sex determination. We review the evolutionary implications of vertically transmitted parasites in arthropods before focusing on strategies of transmission of a parasitic sex ratio distorter in Gammarus duebeni. The efficiency of parasite transmission to new hosts is a key factor underlying the relationship between vertically transmitted parasites and their hosts. Vertically transmitted parasites must overcome 2 bottlenecks in order to ensure successful infection of future host generations: first, transmission from adult to gamete; and secondly, transmission to the germ-line of the infected host. We investigate these 2 processes with regard to transovarial transmission by a microsporidian parasite in Gammarus duebeni. Parasite transmission from adult to eggs is highly efficient, with 96% of eggs of infected mothers inheriting the infection, whereas transmission to germ-line within infected embryos is relatively inefficient (72%). We measure parasite distribution between cells of developing embryos, and use these distributions to infer possible mechanisms of parasite transmission to germ-line. Parasite distribution within the embryo is dependent on host cell lineage, and is not consistent with unbiased segregation between daughter cells. These results indicate that parasites segregate together at host cell division, and may reflect a strategy of differential segregation to the host germ-line. We consider alternative parasite strategies at the cell-level in terms of their evolutionary implications.

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Induced hybrid sterility by injection of streptococcal L-forms into Drosophila paulistorum: dynamics of infection

Cited by 5 publications

References 9 publications

The Drosophila paulistorum Endosymbiont in an Alternative Species

The Drosophila paulistorum Endosymbiont in an Alternative Species

Chapter 1 Bacterial L‐Forms

Evolutionary ecology of vertically transmitted parasites: transovarial transmission of a microsporidian sex ratio distorter inGammarus duebeni

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