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Genetic mapping of linkage group XIX and identification of sex-linked SSR markers in a Populus tremula × Populus tremuloides cross

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A progeny of 130 F1 individuals of an interspecific cross between Populus tremula L. and Populus tremuloides Michx. was used for genetic mapping of linkage group XIX with SSR markers based on the Populus trichocarpa Torr. & A. Gray genome sequence. Several fully sex-linked SSR markers were identified and mapped to a central position on the male P. tremuloides map of linkage group XIX. For the SSR markers tested here, the position on the assembled P. trichocarpa genome sequence is known, allowing sex-linked markers to be assigned to the central region of scaffold/chromosome 19 of P. trichocarpa. The sex linkage of the SSR markers was validated in other P. tremula× P. tremuloides crosses and also tested in Populus alba L. and Populus nigra L.

Les auteurs ont utilisé une descendance de 130 individus F1 issue d’un croisement interspécifique entre Populus tremula L. et Populus tremuloides Michx. afin de cartographier génétiquement le groupe de liaison XIX à l’aide de marqueurs SSR provenant de la séquence du génome de Populus trichocarpa Torr. & A. Gray. Plusieurs marqueurs SSR entièrement liés au sexe ont été identifiés et cartographiés à une position centrale sur la carte mâle du groupe de liaison XIX de P. tremuloides. Pour les marqueurs SSR testés ici, la position est connue sur la séquence assemblée du génome de P. trichocarpa, permettant aux marqueurs liés au sexe d’être assignés à la région centrale de l’assemblage/chromosome 19 de P. trichocarpa. La liaison au sexe des marqueurs SSR a été validée dans d’autres croisements de P. tremula× P. tremuloides et testée aussi chez Populus alba L. et Populus nigra L.

Document Type: Research Article

Publication date: February 1, 2011

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