High genetic diversity in arbuscular mycorrhizal fungi: evidence for recombination events

Article Abstract:

Evidence for recombination events is discussed relative to high genetic diversity in arbuscular mycorrhizal fungi. Spores of two indigenous species of Glomus were isolated from three soils of a long-term field experiment in which different quantities of sewage sludge were used. Reproduction cannot be solely clonal, based on the study findings. Recombination or recombination-like events are likely to occur in the arbuscular mycorrhizal fungi. The fungal species in the soil that had high amounts of sludge added had epidemic population structures.

Fungi, Genetic recombination, Variation (Biology)

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The zone of sympatry and hybridization of Mytilus edulis and M. allotropical, as described by intron length polymorphism at locus mac-1

Article Abstract:

A study has been carried out to document the geographical and genetic structure of the European hybrid zone of mussels, Mytilus edulis and M. galloprovincialis, using DNA markers that are thought to be neutral and nuclear. The first intron of the mac-1 actin gene shows considerable variability in length with 23 alleles detected so far in the two European species of interest.

Biological diversity, Biodiversity, Introns

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Wolbachia endosymbiont responsible for cytoplasmic incompatability in a terrestrial crustacean: effects in natural and foreign hosts

Article Abstract:

The Wolbachia hosted by Cylisticus convexus (sCc) have been found to bring on unidirectional cytoplasmic incompatibility, an effect found commonly in insects. It has been shown that wCc reduces the mating capacity of infected C. convexus males, which suggests that the bacteria may alter reproductive behavior. Maintenance of wCc in host populations is discussed.

Environmental aspects, Host-bacteria relationships, Sexual behavior in animals, Animal sexual behavior, Endosymbiosis, Isopoda, Isopods, Crustacea, Crustaceans, Wolbachia

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