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Fine mapping of the sunflower resistance locus Pl ARG introduced from the wild species Helianthus argophyllus |
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| Authors: | S Wieckhorst E Bachlava C M Dußle S Tang W Gao C Saski S J Knapp C-C Schön V Hahn E Bauer |
| Institution: | 1. Plant Breeding, Center of Life and Food Sciences Weihenstephan, Technische Universit?t München, 85354, Freising, Germany 2. Center for Applied Genetic Technologies, University of Georgia, Athens, GA, 30602, USA 3. State Plant Breeding Institute, Universit?t Hohenheim, 70599, Stuttgart, Germany 4. Clemson University Genomics Institute, Clemson, SC, 29634, USA 5. Monsanto Vegetables, Inc., 37437 State Highway 16, Woodland, CA, 95695, USA |
| Abstract: | Downy mildew, caused by Plasmopara halstedii, is one of the most destructive diseases in cultivated sunflower (Helianthus annuus L.). The dominant resistance locus Pl ARG originates from silverleaf sunflower (H. argophyllus Torrey and Gray) and confers resistance to all known races of P. halstedii. We mapped Pl ARG on linkage group (LG) 1 of (cms)HA342 × ARG1575-2, a population consisting of 2,145 F2 individuals. Further, we identified resistance gene candidates (RGCs) that cosegregated with Pl ARG as well as closely linked flanking markers. Markers from the target region were mapped with higher resolution in NDBLOSsel × KWS04, a population consisting of 2,780 F2 individuals that does not segregate for Pl ARG . A large-insert sunflower bacterial artificial chromosome (BAC) library was screened with overgo probes designed for markers RGC52 and RGC151, which cosegregated with Pl ARG . Two RGC-containing BAC contigs were anchored to the Pl ARG region on LG 1. |
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