Microsatellite Analysis and Urediniospore Dispersal Simulations Support the Movement of Puccinia graminis f. sp. tritici from Southern Africa to Australia

Phytopathology
Botma VisserZacharias A Pretorius

Abstract

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 modeling. 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 approximately 7% of all simulated release days) compared with other potential source regions in southern Africa. The study acts as a warning of possi...Continue Reading

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Citations

Feb 3, 2021·Plant Disease·Rinette LabuschagneBotma Visser
Oct 30, 2019·Environmental Research Letters : ERL [Web Site]·Clare Allen-SaderChristopher A Gilligan
Oct 20, 2020·Plant Disease·Wilku B MeyerBotma Visser
Jul 24, 2021·Nature Plants·Narayana M UpadhyayaPeter N Dodds
Jun 3, 2021·Annual Review of Phytopathology·Sebastien DuplessisM Catherine Aime

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