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Park, R.F.

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Park
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R.F.
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Park, R.F.

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  • Origin and evolution of the bread wheat D genome
    (Nature Publishing Group, 2024) Cavalet-Giorsa, E.; Gonzalez-Munoz, A.; Naveenkumar Athiyannan; Holden, S.; Adil Salhi; Gardener, C.; Quiroz-Chávez, J.; Rustamova, S.M.; Elkot, A.F.; Patpour, M.; Awais Rasheed; Long Mao; Lagudah, E.S.; Periyannan, S.; Sharon, A.; Himmelbach, A.; Reif, J.C.; Knauft, M.; Mascher, M.; Stein, N.; Chayut, N.; Ghosh, S.; Perovic, D.; Putra, A.; Perera, A.B.; Chia-Yi Hu; Guotai Yu; Hanin Ibrahim Ahmed; Laquai, K.D.; Rivera, L.F.; Renjie Chen; Yajun Wang; Xin Gao; Liu, S.; Raupp, W.J.; Olson, E.; Jong-Yeol Lee; Chhuneja, P.; Kaur, S.; Peng Zhang; Park, R.F.; Yi Ding; Deng-Cai Liu; Wanlong Li; Nasyrova, F.Y.; Dvorak, J.; Mehrdad Abbasi; Meng Li; Kumar, N.; Meyer, W.B.; Boshoff, W.H.P.; Steffenson, B.J.; Matny, O.; Sharma, P.K.; Tiwari, V.K.; Grewal, S.; Pozniak, C.J.; Harmeet Singh Chawla; Ens, J.; Dunning, L.T.; Kolmer, J.A.; Lazo, G.R.; Xu, S.; Yong Q. Gu; Xianyang Xu; Uauy, C.; Abrouk, M.; Bougouffa, S.; Brar, G.S.; Wulff, B.B.H.; Krattinger, S.G.
    Publication
  • Genetic mapping of stripe rust resistance in a geographically diverse barley collection and selected biparental populations
    (Frontiers, 2024) Singh, D.; Ziems, L.; Chettri, M.; Dracatos, P.M.; Forrest, K.L.; Bhavani, S.; Singh, R.P.; Barnes, C.W.; Noroña Zapata, P.J.; Gangwar, O.; Kumar, S.; Bhardwaj, S.; Park, R.F.
    Publication
  • Identification of synthetic wheat lines with broadly effective stripe rust resistance
    (Springer Netherlands, 2024) Karanjeet S. Sandhu; Singh, D.; Fikrte Yirga Belayineh; Negash, T.; Khan, H.; Bhardwaj, S.; Baidya, S.; Thapa, D.B.; Muhammad Fayyaz; Shahzad Asad; Randhawa, M.S.; Park, R.F.
    Publication
  • High-density mapping of triple rust resistance in barley using DArT-Seq markers
    (Frontiers, 2019) Dracatos, P.M.; Haghdoust, R.; Singh, R.P.; Huerta-Espino, J.; Barnes, C.W.; Forrest, K.L.; Hayden, M.; Niks, R.; Park, R.F.; Singh, D.
    The recent availability of an assembled and annotated genome reference sequence for the diploid crop barley (Hordeum vulgare L.) provides new opportunities to study the genetic basis of agronomically important traits such as resistance to stripe [Puccinia striiformis f. sp. hordei (Psh)], leaf [P. hordei (Ph)], and stem [P. graminis f. sp. tritici (Pgt)] rust diseases. The European barley cultivar Pompadour is known to possess high levels of resistance to leaf rust, predominantly due to adult plant resistance (APR) gene Rph20. We developed a barley recombinant inbred line (RIL) population from a cross between Pompadour and the leaf rust and stripe rust susceptible selection Biosaline-19 (B-19), and genotyped this population using DArT-Seq genotyping by sequencing (GBS) markers. In the current study, we produced a high-density linkage map comprising 8,610 (SNP and in silico) markers spanning 5957.6 cM, with the aim of mapping loci for resistance to leaf rust, stem rust, and stripe rust. The RIL population was phenotyped in the field with Psh (Mexico and Ecuador) and Ph (Australia) and in the greenhouse at the seedling stage with Australian Ph and Pgt races, and at Wageningen University with a European variant of Psh race 24 (PshWUR). For Psh, we identified a consistent field QTL on chromosome 2H across all South American field sites and years. Two complementary resistance genes were mapped to chromosomes 1H and 4H at the seedling stage in response to PshWUR, likely to be the loci rpsEm1 and rpsEm2 previously reported from the cultivar Emir from which Pompadour was bred. For leaf rust, we determined that Rph20 in addition to two minor-effect QTL on 1H and 3H were effective at the seedling stage, whilst seedling resistance to stem rust was due to QTL on chromosomes 3H and 7H conferred by Pompadour and B-19, respectively.
    Publication
  • Microsatellite analysis and urediniospore dispersal simulations support the movement of Puccinia graminis f. sp. tritici from Southern Africa to Australia
    (American Phytopathological Society (APS), 2019) Visser, B.; Meyer, M.; Park, R.F.; Gilligan, C.A.; Burgin, L.; Hort, M.C.; Hodson, D.P.; Pretorius, Z.
    The Australian wheat stem rust (Puccinia graminis f. sp. tritici) population was shaped by the introduction of four exotic incursions into the country. It was previously hypothesized that at least two of these (races 326-1,2,3,5,6 and 194-1,2,3,5,6 first detected in 1969) had an African origin and moved across the Indian Ocean to Australia on high-altitude winds. We provide strong supportive evidence for this hypothesis by combining genetic analyses and complex atmospheric dispersion modelling. Genetic analysis of 29 Australian and South African P. graminis f. sp. tritici races using microsatellite markers confirmed the close genetic relationship between the South African and Australian populations, thereby confirming previously described phenotypic similarities. Lagrangian Particle Dispersion Model simulations using finely resolved meteorological data showed that long distance dispersal events between southern Africa and Australia are indeed possible, albeit rare. Simulated urediniospore transmission events were most frequent from central South Africa (viable spore transmission on ~7% of all simulated release days) compared with other potential source regions in southern Africa. The study acts as a warning of possible future P. graminis f. sp. tritici dispersal events from southern Africa to Australia, which could include members of the Ug99 race group, emphasizing the need for continued surveillance on both continents.
    Publication
  • Detection of wheat stem rust races TTHSK and PTKTK in the Ug99 race group in Kenya in 2014
    (American Phytopathological Society (APS), 2016) Fetch, T.; Zegeye, T.; Park, R.F.; Hodson, D.P.; Wanyera, R.
    Wheat stem rust, caused by Puccinia graminis f. sp. tritici, causes severe losses in wheat production under epidemic conditions. The detection of isolate Ug99 in east Africa (Pretorius et al. 2000) has raised global concerns of the vulnerability of wheat to stem rust. Since initial detection, 10 variants of Ug99 have been reported across 13 countries (Patpour et al. 2015). Wheat stem rust infection was widespread in Kenya in 2014. Fifty-two samples from common wheat were collected from the Mount Kenya and North, South, and Central Rift regions and analyzed for race identity in a level-3 biocontainment laboratory in Canada. Of these samples, 41 yielded viable spores for race pathotyping. Each sample was inoculated on 8-day-old seedlings of 20 single-gene differential lines using an inoculator, incubated for 16 h in a dew chamber in the dark, and subsequently moved to a growth cabinet set at 18 ± 1°C and 16-h photoperiod. Infected plants were rated 14 days postinoculation using a 0 to 4 infection type scale. Virulence analysis using the letter-code nomenclature system (Jin et al. 2008) identified two new races in the Ug99 race group from repeated experiments. Race TTHSK was identified from samples collected at Ngorengore (South Rift) and Njoro (field 13), which differs from the original Ug99 isolate (race TTKSK) by avirulence on gene Sr30. Race TTHSK is similar to race TTHST, which was detected previously by Newcomb et al. (manuscript in preparation). Race PTKTK was identified from samples collected at Rotian and Eor-Enkitok in the South Rift region, Cheplasgei and Kaplogoi in the North Rift region, and at the technology farm in Njoro in the Central Rift region. Race PTKTK differs from race PTKSK (first identified in 2007) by additional virulence to gene SrTmp, or alternatively differs from race TTKTK by avirulence to gene Sr21. Races TTKTK and TTKTT in the Ug99 race group with virulence to gene SrTmp were also found in 2014 (Patpour et al. 2015; Patpour et al. 2016). Virulence to SrTmp was detected soon after the deployment of the variety ‘Kenya Robin’ (which has SrTmp) in 2011. This report now brings the total number of variants in the Ug99 race group to 13 and highlights the importance of stem rust surveillance and race pathotyping, particularly in Kenya and surrounding countries in eastern Africa where evolution of new stem rust virulence is frequent.
    Publication