Virulence and molecular polymorphisms of the wheat leaf rust fungus Puccinia triticina in Canada from 1997 to 2007

Xiben Wang; Bakkeren, Guus; McCallum, Brent
June 2010
Botany;Jun2010, Vol. 88 Issue 6, p575
Academic Journal
Populations of Puccinia triticina, one of the casual agents of wheat leaf rust disease, in the pacific (British Columbia and Alberta), prairie (Manitoba and Saskatchewan), and eastern regions (Quebec and Ontario) of Canada from 1997 to 2007 were analyzed for virulence and genetic diversity by revealing expressed sequence tag derived simple sequence repeat (EST-SSR) polymorphisms. Since 1997, a significant shift in the virulence of P. triticina occurred across Canada. The diversity of P. triticina virulence phenotypes in Manitoba and Saskatchewan, as measured by Shannon and Simpson indexes, decreased due to the directional selection toward predominant virulence phenotypes, whereas it remained relatively constant in Quebec and Ontario. The clustering of P. triticina virulence phenotypes from 1997 to 2007 was similar to that found in previous years, and was correlated with virulence to leaf rust resistance genes Lr2a, Lr2c, and Lr17a. Distinct EST-SSR profiles were found in different groups of P. triticina virulence phenotypes based on virulence to Lr2a, Lr2c, and Lr17a. In addition, the population of P. triticina in Manitoba and Saskatchewan was different from that in Quebec and Ontario from 1997 to 2007, based on both virulence characteristics and EST-SSR genotypes. Les auteurs ont analysé les populations du Puccinia triticina, l'agent causal de la rouille foliaire du blé dans les régions du pacifique (Colombie britannique et Alberta), des prairies (Manitoba et Saskatchewan) et de l'est (Québec et Ontario) au Canada, de 1997 à 2007, en déterminant la virulence et la diversité génétique mises en évidence par les polymorphismes par le polymorphisme de marqueurs de type microsatellites dérivé d’étiquettes de séquences exprimées (EST-SSR). Depuis 1997, on observe un glissement significatif de la virulence du P. triticina à travers le Canada. La diversité des phénotypes de virulence du P. triticina au Manitoba et en Saskatchewan, telle que mesurée par les index de Shannon et de Simpson, adiminué dûà une sélection directionnelle vers des phénotypes virulents prédominants, alors que cette diversité est demeurée relativement constante au Québec et en Ontario. Le regroupement des phénotypes de virulence du P. triticina de 1997 à 2007, ne diffère pas de celui observé au cours des années antécédentes, et montre une corrélation avec la virulence des gènes de résistance à la rouille foliaire Lr2a, Lr2c et Lr17a. On observe des profils EST-SSR dans différents groupes de phénotypes de virulence du P. triticina, basés sur les gènes de virulence à Lr2a, Lr2c et Lr17a. De plus, la population du P. triticina du Manitoba et de la Saskatchewan s'éloigne de celle du Québec et de l'Ontario entre 1997 et 2007, en se basant à la fois sur les caractéristiques de virulence et sur les génotypes EST-SSR.


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