Sylvia K Erasmuson

Learn More
Although apomixis has been quoted as a technology with the potential to deliver benefits similar in scale to those achieved with the Green Revolution, very little is currently known of the genetic mechanisms that control this trait in plants. To address this issue, we developed Hieracium, a genus of daisies native to Eurasia and North America, as a genetic(More)
Species in the genus Hieracium subgenus Pilosella form asexual seed by the mechanism of apospory. We have reported previously that the capacity to be apomictic is inherited in these plants as a dominant trait at a single locus. The level of expression, however, is under the influence of a number of unlinked modifier loci. Several strategies are now being(More)
Strains of Mycobacterium bovis, the causative organism of bovine tuberculosis, can be clearly distinguished from each other by restriction fragment analysis. This method of DNA fingerprinting has been used for many epidemiological studies in New Zealand, but the technique presents practical difficulties that hinder its widespread use. The insertion element(More)
Groups of 10-12 Romney and Merino wethers were challenged simultaneously with homologous experimental footrot infection after having received the second of 2 doses of Bacteroides nodosus (strain 198) vaccine 0, 4, 8, 12, 16 and 20 weeks previously. Inoculations were carried out 28 days apart and unvaccinated sheep of both breeds were challenged as controls.(More)
Polyploidisation is a common mechanism underlying genome evolution in plants. Both polyploid and aneuploid individuals occur naturally at low frequency in diploid species because of unbalanced or unreduced gamete formation during meiosis. We evaluated the Illumina Infinium® II FruitBreedomics 20K apple single nucleotide polymorphism (SNP) array for its(More)
To obtain a wider definition of variation in the virulence of Bacteroides nodosus and in the protective potency of B. nodosus vaccines, we made a comparison of the in vitro characteristics of isolates from clinical infections of sheep and cattle and of certain colony variants observed previously. Three basic colony types were distinguished: papillate or(More)
  • 1