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Construction of a YAC library from barley cultivar Franka and identification of YAC-derived markers linked to the Rh2 gene conferring resistance to scald (Rhynchosporium secalis)

by: D Schmidt
pp. 1031-1040.


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The Rh2 resistance gene of barley (Hordeum vulgare) confers resistance against the scald pathogen (Rhynchosporium secalis). A high-resolution genetic map of the Rh2 region on chromosome 1 (7H) was established by the use of molecular markers. Tightly linked markers from this region were used to screen existing and a newly constructed yeast artificial chromosome (YAC) library of barley cv. Franka composed of 45 000 clones representing approximately two genome equivalents. Corresponding YAC clones were identified for most markers, indicating that the combined YAC library has good representation of the barley genome. The contiguous sets of YAC clones with the most tightly linked molecular markers represent entry points for map-based cloning of this resistance gene.Key words: yeast artificial chromosomes, map-based cloning, disease resistance gene, library screening, Hordeum vulgare.Le gène Rh2 chez l'orge (Hordeum vulgare) confère la résistance à l'agent causal de la rhynchosporiose, le Rhynchosporium secalis. Une carte génétique à haute résolution de la région du chromosome 1 (7H) où se trouve Rh2 a été produite à l'aide de marqueurs moléculaires. Des marqueurs fortement liés provenant de cette région ont été utilisés pour cribler une banque génomique du cultivar Franka comptant 45 000 clones YAC (chromosomes artificiels de levure), soit l'équivalent d'environ deux génomes. Des clones YAC ont été identifiés pour la plupart des marqueurs indiquant que la banque YAC offre une bonne représentativité du génome de l'orge. Les contigs de clones YAC portant les marqueurs les plus fortement liés constituent des points de départ en vue du clonage positionnel de ce gène de résistance.Mots clés : chromosomes artificiels de levure, clonage positionnel, gène de résistance, criglage de banques, Hordeum vulgare.[Traduit par la Rédaction]


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