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High-resolution mapping of Rym14Hb, a wild relative resistance gene to barley yellow mosaic disease

ORCID
0000-0002-9802-1787
Zugehörigkeit
Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Germany
Pidon, Hélène;
Zugehörigkeit
KWS SAAT SE & Co. KGaA, Einbeck, Germany
Wendler, Neele;
GND
1059141299
Zugehörigkeit
Julius Kühn-Institute (JKI), Institute for Resistance Research and Stress Tolerance, Germany
Habekuß, Antje;
Zugehörigkeit
KWS LOCHOW GMBH, Bergen, Germany
Maasberg, Anja;
GND
115742360
Zugehörigkeit
Julius Kühn-Institute (JKI), Institute for Breeding Research on Agricultural Crops, Germany
Ruge-Wehling, Brigitte;
GND
1059141701
Zugehörigkeit
Julius Kühn-Institute (JKI), Institute for Resistance Research and Stress Tolerance, Germany
Perovic, Dragan;
GND
172295300
Zugehörigkeit
Julius Kühn-Institute (JKI), Institute for Resistance Research and Stress Tolerance, Germany
Ordon, Frank;
ORCID
0000-0003-3011-8731
Zugehörigkeit
Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Germany; CiBreed - Center for Integrated Breeding Research, Göttingen, Germany
Stein, Nils

Abstract Barley yellow mosaic disease is caused by Barley yellow mosaic virus and Barley mild mosaic virus, and leads to severe yield losses in barley ( Hordeum vulgare ) in Central Europe and East-Asia. Several resistance loci are used in barley breeding. However, cases of resistance-breaking viral strains are known, raising concerns about the durability of those genes. Rym14 Hb is a dominant major resistance gene on chromosome 6HS, originating from barley’s secondary genepool wild relative Hordeum bulbosum . As such, the resistance mechanism may represent a case of non-host resistance, which could enhance its durability. A susceptible barley variety and a resistant H. bulbosum introgression line were crossed to produce a large F 2 mapping population (n=7,500), to compensate for a ten-fold reduction in recombination rate compared to intraspecific barley crosses. After high-throughput genotyping, the Rym14 Hb locus was assigned to a 2Mbp telomeric interval on chromosome 6HS. The co-segregating markers developed in this study can be used for marker-assisted introgression of this locus into barley elite germplasm with a minimum of linkage drag.

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