Evolution

Infection, Polymorphism and Evolution by Curtis M. Lively, R. Stephen Howard (auth.), W. D. Hamilton,

By Curtis M. Lively, R. Stephen Howard (auth.), W. D. Hamilton, J. C. Howard (eds.)

Resulting from a Royal Society dialogue assembly, this quantity offers a quick evaluate of the subject of parasite-host co-evolution. present pondering on evolution in parasites, viruses and different pathogens is discussed.

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However, aphids (Schizaphus graminum) were occasionally observed, and in one experiment, the presence of aphids was correlated with advantages for genetic variability in seedlings (Schmitt & Antonovics 1986). In an initial survey, I tested 45 flowering Anthoxanthum plants in this field for a cosmopolitan, aphidborne RNA virus, barley yellow dwarf luteovirus (Rochow & Duffus 1981), by using direct enzymelinked immunosorbent assay (ELISA). Twenty percent of adult Anthoxanthum tested positive for BYDv-strain SGV (transmitted specifically by S.

360, 121-125. H. 1991 Bacteriocin typing and biotyping of clinical isolates of Serratia marcescens. Int. J. med. Microbiol. 275, 474-486. E. 1968 Disease resistance in plants. New York: Academic Press. M. M. 1988 Genetics oj resistance to bacterial and parasitic injection. London: Taylor & Francis. G. E. 1991 Restriction and modification systems. A. Rev. Genet. 25, 585-627. 3 Viral pathogens and the advantage of sex in the perennial grass Anthoxanthum odoratum STEVEN E. A. SUMMARY The ubiquity of sexual reproduction among plants and animals remains one of the major unresolved paradoxes of modern evolutionary biology.

If there are different foci of foundress aphids invading the grass population bringing different viruses, then virus genotypes in the different field plots could be completely different. Genotypes specific infectivity or virulence could produce the Switzerland). inconsistent results he observed for the three neighbour treatments? S. E. KELLEY. Dr Shykoff brings up an excellent point. Different viral strains and different aphid clones located in throughout the field could explain the inconsistent results.

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