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PlArg from Helianthus argophyllus is unlinked to other known downy mildew resistance genes in sunflower

Dussle, C.M.; Hahn, V.; Knapp, S.J.; Bauer, E.

Tag. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik 109(5): 1083-1086

2004


ISSN/ISBN: 0040-5752
PMID: 15221147
DOI: 10.1007/s00122-004-1722-9
Accession: 004271613

The PlArg locus in the sunflower (Helianthus annuus L.) inbred line Arg1575-2 conferring resistance to at least four tested races (300, 700, 730, 770) of downy mildew (Plasmopara halstedii) was localized by the use of simple sequence repeat (SSR) markers. Bulked segregant analysis (BSA) was conducted on 126 individuals of an F2 progeny from a cross between a downy mildew susceptible line, CmsHA342, and Arg1575-2. Twelve SSR markers linked to the Pl Arg locus were identified. All markers were located proximal to PlArg on linkage group LG1 based on the map of Yu et al. (2003) in a window of 9.3 cM. Since PlArg was mapped to a linkage group different from all other Pl genes previously mapped with SSRs, it can be concluded that Pl Arg provides a new source of resistance against P. halstedii in sunflower.

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