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Apomixis: Embryo Sacs and Embryos Formed without Meiosis or Fertilization in Ovules

1993; Oxford University Press; Volume: 5; Issue: 10 Linguagem: Inglês

10.2307/3869793

1532-298X

Anna M. Koltunow,

Assisted Reproductive Technology and Twin Pregnancy

Objectives: To determine the relationship between New Zealand isolates of antibiotic-resistant Streptococcus pneumoniae and internationally widespread resistant clones.Methods: Fifty-nine isolates representing both invasive and non-invasive pneumococci from multiple locations, serotypes and years were analysed by multilocus sequence typing.Results: Major international clones, including Spain 23F -1, France 9V -3 and Taiwan 19F -14, were found to be present in New Zealand.A one-allele variant of the Taiwan 19F -14 clone (aroE 15 !4, ST 271) was particularly prominent.Conclusions: Antibiotic-resistant pneumococci have not evolved de novo in New Zealand, but were introduced to the country during the early 1990s.