Gregory J. Platz

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A doubled haploid (DH) barley (Hordeum vulgare L.) population of 334 lines (ND24260 × Flagship) genotyped with DArT markers was used to map genes for adult plant resistance (APR) to leaf rust (Puccinia hordei Otth) under field conditions in Australia and Uruguay. The Australian barley cultivar Flagship carries an APR gene (qRphFlag) derived from the(More)
“To find stable resistance using association mapping tools, QTL with major and minor effects on leaf rust reactions were identified in barley breeding lines by assessing seedlings and adult plants.” Three hundred and sixty (360) elite barley (Hordeum vulgare L.) breeding lines from the Northern Region Barley Breeding Program in Australia were genotyped with(More)
Evaluation of resistance to Pyrenophora teres f. maculata in barley breeding populations via association mapping revealed a complex genetic architecture comprising a mixture of major and minor effect genes. In the search for stable resistance to spot form of net blotch (Pyrenophora teres f. maculata, SFNB), association mapping was conducted on four(More)
No complete resistance to Pyrenophora tritici-repentis has been located in more than 1400 bread wheats examined. Incomplete resistance, however, occurs at different levels in many spring and winter types and data are presented for the strongest sources of resistance detected. In particular, there is a high frequency of Brazilian spring wheats with(More)
A recently developed spot form of blotch differential set of 16 barley lines was tested for reaction response to 60 Pyrenophora teres f. maculata isolates from geographically disperse barley crops of Australia. Twelve barley lines (Arimont, Barque, Chebec, CI5286, CI5791, CI9214, CII6150, Dairokkaku, Esperance Orge 289, Galleon, Keel, Skiff, Torrens and(More)
A survey of the Australian barley powdery mildew (Blumeria graminis f. sp. hordei) population was conducted in 2010 and 2011. Three hundred and sixty-two isolates of the pathogen were collected from 18 locations across all six states of Australia. Thirty-two barley differentials were used and 11 genotypes were able to differentiate the population with(More)
Fourteen single nucleotide polymorphisms (SNPs) were identified at the mating type (MAT) loci of Pyrenophora teres f. teres (Ptt), which causes net form (NF) net blotch, and P. teres f. maculata (Ptm), which causes spot form (SF) net blotch of barley. MAT-specific SNP primers were developed for polymerase chain reaction (PCR) and the two forms were(More)
  • R. G. Rees, G. J. Platz
  • 2011
The poplar rust fungus Melampsora medusae Thum. previously reported from New South Wales (2) and Victoria (1) was first found at Beerwah in late December, 1972. The disease appears confined to the south-east having been recorded also on unidentified deciduous Populus spp. in Brisbane and Stanthorpe and on four semi-evergreen poplars growing in trial plots(More)
  • R. G. Rees, G. J. Platz
  • 2011
was tested by inoculating 10 Josephine pears. Each pear was inoculated in 5 positions by wounding with the point of a tooth pick previously scraped across the surface of a sporulating culture. The wild and benomyl tolerant strains were inoculated in the same manner to separate batches of 5 pears. Inoculated fruit were sealed in plastic bags and kept at(More)
Pyrenophora teres f. teres (Ptt) is the causal agent of net form of net blotch (NFNB) – a major foliar disease of barley (Hordeum vulgare) crops worldwide. Deployment of genetic resistance in cultivars is the preferred method of control, but requires knowledge of the pathogenic variation of Ptt to be effective as spatial and temporal variation is common. In(More)