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Genetic Diversity for Pink Snow Mold Resistance in Greens-Type Annual Bluegrass

Show simple item record Bertrand, Annick Castonguay, Yves Cloutier, Jean Couture, Luc Hsiang, Tom Dionne, Julie Laberge, Serge 2010-12-27T19:01:02Z 2010-12-27T19:01:02Z 2008-06-02
dc.identifier.citation Bertrand, A., Castonguay, Y., Cloutier, J., Couture, L., Hsiang, T., Dionne, J., Laberge, S. "Genetic Diversity for Pink Snow Mold Resistance in Greens-Type Annual Bluegrass." Crop Science 49.2, (2009): 589-599
dc.description.abstract Unseeded annual bluegrass (Poa annua L.)is an important component of golf greens in many regions of Canada and the United States. Although this turfgrass species has desirable playing attributes, it suffers from susceptibility to environmental and biological stresses including subfreezing temperatures and snow molds. In this study, we compared 29 genotypes collected from golf greens located in Québec and Ontario for their resistance to pink snow mold(SM). Plants were inoculated with Microdochium nivale [(Fries) Samuels & Hallett], causal agent of SM, and incubated under controlled conditions. High levels of variation in SM resistance were detected within the collection and between genotypes. Analysis of the relationship between climatic parameters at the sites of origin and SM susceptibility revealed that level of resistance was positively correlated to the duration of snow cover. Genetic diversity within the Poa collection was estimated using the sequence related amplifi ed polymorphism (SRAP) technique. The UPGMA (unweighted-pair group method arithmetic average) dendrogram yielded two main clusters that differed markedly in their proportion of SM-resistant genotypes. Our results show that SM disease is a major selection pressure for the generation of genetic diversity among annual bluegrass biotypes that evolved on golf greens in northern climates. SRAP polymorphisms between bulked genotypes with contrasting resistance to SM were identifi ed and could be used as markers for SM resistance in annual bluegrass.
dc.language.iso en en_US
dc.publisher Crop Science en_US
dc.subject Genetic Diversity en_US
dc.subject Pink Snow Mold en_US
dc.subject Resistance en_US
dc.subject Bluegrass en_US
dc.title Genetic Diversity for Pink Snow Mold Resistance in Greens-Type Annual Bluegrass en_US
dc.type Article en_US
dc.contributor.affiliation School of Environmental Sciences

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