Microsatellite markers for the drought‐resistant earthworm <i>Hormogaster elisae</i>

Novo, Marta; Velavan, Thirumalaisamy P.; Almodóvar, Ana; Schulenburg, Hinrich; Díaz‐Cosín, Darío J.; Michiels, Nico K.

doi:10.1111/j.1755-0998.2008.02105.x

Cited by 17 publications

(1 citation statement)

References 10 publications

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“…However, analysis of COI and 28S genes performed in the present investigations was not sufficient for precise identification of parents of aAF hybrids in the progeny of backcrosses of aAF with aAA or fFF worms ( Fig 4 ). In such a case studies of highly polymorphic microsatellite loci [ 35 – 37 ] shall give conclusive explanation. E.g.…”

Section: Resultsmentioning

confidence: 99%

The existence of fertile hybrids of closely related model earthworm species, Eisenia andrei and E. fetida

et al. 2018

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Lumbricid earthworms Eisenia andrei (Ea) and E. fetida (Ef) are simultaneous hermaphrodites with reciprocal insemination capable of self-fertilization while the existence of hybridization of these two species was still debatable. During the present investigation fertile hybrids of Ea and Ef were detected. Virgin specimens of Ea and Ef were laboratory crossed (Ea+Ef) and their progeny was doubly identified. 1 –identified by species-specific maternally derived haploid mitochondrial DNA sequences of the COI gene being either ‘a’ for worms hatched from Ea ova or ‘f’ for worms hatched from Ef ova. 2 –identified by the diploid maternal/paternal nuclear DNA sequences of 28s rRNA gene being either ‘AA’ for Ea, ‘FF’ for Ef, or AF/FA for their hybrids derived either from the ‘aA’ or ‘fF’ ova, respectively. Among offspring of Ea+Ef pairs in F1 generation there were mainly aAA and fFF earthworms resulted from the facilitated self-fertilization and some aAF hybrids from aA ova but none fFA hybrids from fF ova. In F2 generation resulting from aAF hybrids mated with aAA a new generations of aAA and aAF hybrids were noticed, while aAF hybrids mated with fFF gave fFF and both aAF and fFA hybrids. Hybrids intercrossed together produced plenty of cocoons but no hatchlings independently whether aAF+aAF or aAF+fFA were mated. These results indicated that Ea and Ef species, easy to maintain in laboratory and commonly used as convenient models in biomedicine and ecotoxicology, may also serve in studies on molecular basis of interspecific barriers and mechanisms of introgression and speciation. Hypothetically, their asymmetrical hybridization can be modified by some external factors.

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Section: Resultsmentioning

confidence: 99%