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Luis Fernández, Luis Alejandro de Haro, Ana J. Distefano, Maria Carolina Martínez, Verónica Lía, Juan C. Papa, Ignacio Olea, Daniela Tosto and Horacio Esteban Hopp Population genetics structure of glyphosate-resistant Johnsongrass (Sorghum halepense L. Pers) does not support a single origin of the resistance Ecology and Evolution 3

Article first published online: 24 AUG 2013 | DOI: 10.1002/ece3.671

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Single sequence repeats (SSR) developed for Sorghum bicolor were used to characterize the genetic distance of different Sorghum halepense (Johnsongrass) accessions from Argentina some of which have evolved toward glyphosate resistance. UPGMA, Mantel, and Discriminant Analysis of Principal Components analysis showed that Johnsongrass glyphosate-resistant accessions that belong to different geographic regions do not share similar genetic backgrounds. Consequently, these results do not support a single genetic origin of glyphosate resistance.

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