Strategies of Breeding for Durable Disease Resistance in Cereals

Friedt, Wolfgang; Werner, Kay; Pellio, Bettina; Weiskorn, Claudia; Krämer, Marco; Ordon, Frank

doi:10.1007/978-3-642-55819-1_8

Cited by 7 publications

(3 citation statements)

References 174 publications

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“…Therefore, barley breeders need new resistance genes or alleles effective against the virulence spectra arising in the existing pathogen populations. A strategy that has been proposed to increase the durability of resistance consists in pyramiding several resistance genes in a single cultivar (Friedt et al 2003). This strategy specifically demands for the use of molecular markers.…”

Section: Introductionmentioning

confidence: 99%

Fine mapping and comparative genomics integration of two quantitative trait loci controlling resistance to powdery mildew in a Spanish barley landrace

et al. 2011

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The intervals containing two major quantitative trait loci (QTL) from a Spanish barley landrace conferring broad spectrum resistance to Blumeria graminis, were subjected to marker saturation.First, all the available information on recently developed marker resources for barley was exploited.Then, a comparative genomic analysis of the QTL regions to other sequenced grass model species was performed. As a result of the first step, thirty-two new markers were added to the previous map and new flanking markers closer to both QTL were identified. Next, syntenic integration revealed that the barley target regions showed homology with regions on chromosome 6 of rice (Oryza sativa), chromosome 10 of Sorghum bicolor and chromosome 1 of Brachypodium distachyon. A nested insertion of ancestral syntenic blocks on Brachypodium chromosome 1 was confirmed.Based on sequence information of the most likely candidate orthologous genes, twenty-three new barley unigene-derived markers were developed and mapped within the barley target regions. The assessment of colinearity revealed an inversion on chromosome 7HL of barley compared to the other three grass species and nearly perfect colinearity on chromosome 7HS. This two-step marker enrichment allowed for the refinement of the two QTL to much smaller intervals. Inspection of all predicted proteins for the barley unigenes identified within the QTL intervals did not reveal the presence of resistance gene candidates. This study demonstrates the usefulness of sequenced genomes for fine mapping and paves the way for the use of these two loci in barley breeding programs.

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Section: Introductionmentioning

confidence: 99%

Fine mapping and comparative genomics integration of two quantitative trait loci controlling resistance to powdery mildew in a Spanish barley landrace

et al. 2011

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“…Tuvesson et al 2006). Newly identified genes like rym15 on chromosome 6H (Le Gouis et al 2004) or the BaYMV/BaYMV-2 resistance of 'Chikurin Ibaraki 1' on chromosome 5H (Werner et al 2003) can be incorporated easily in such pyramiding strategies.…”

Section: Dhs In Pyramiding Of Resistance Genes Against the Barley Yelmentioning

confidence: 98%

Localisation and combination of resistance genes against soil-borne viruses of barley (BaMMV, BaYMV) using doubled haploids and molecular markers

2006

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Barley yellow mosaic virus disease caused by different strains of BaYMV and BaM-MV is a major threat to winter barley cultivation in Europe. Different resistance genes against these viruses have been mapped and suitable PCR-based markers have been developed. In this respect doubled haploid (DH) populations proved to be advantageous as they facilitate a repeated test for resistance against all agents of the barley yellow mosaic virus complex and besides this, dominant marker systems are as informative as co-dominant ones in DHs due to the lack of heterozygous genotypes. Using DH populations resistance genes rym4, rym5, rym11, rym13, rym15 and the BaYMV/BaYMV-2 resistance of the barley cultivar 'Chikurin Ibaraki 1' have been mapped. DHs are also well suited to pyramiding resistance genes against BaMMV and BaYMV. Since homozygous recessive genotypes are more frequent in DHs than in segregating F 2 populations, DHs can be efficiently used to create broadspectrum resistance and to extend the usability of partly overcome resistance genes. Results from employing two different strategies for pyramiding, based on one and two DH-steps, respectively, combining three recessive resistance genes, i.e. rym4/rym5, rym9 and rym11, are presented. The faster strategy based on one haploidy step resulted in the identification of all three and two-way combinations of the respective resistance genes.

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“…In practice, the availability of appropriate molecular markers allows doubled haploid populations (DHs) to be screened in vitro and only those plantlets that carry the resistance encoding allele have to be transferred to the greenhouse. An overview on molecular breeding schemes for resistance is given by Friedt et al. (2003b) and Friedt and Ordon (2004, 2007).…”

Section: Sources and Genetics Of Resistance/tolerancementioning

confidence: 99%

Virus Resistance in Cereals: Sources of Resistance, Genetics and Breeding

Ordon

Habekuß

Kastirr³

et al. 2009

Journal of Phytopathology

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In cereals, soil‐borne viruses transmitted by the plasmodiophorid Polymyxa graminis (e.g., Barley mild mosaic virus, Barley yellow mosaic virus or Soil‐borne cereal mosaic virus), have increased in importance due to the increase of the acreage infested and because yield losses cannot be prevented by chemical measures. Due to global warming, it is also expected that insect transmitted viruses vectored by aphids (e.g., Barley yellow dwarf virus, Cereal yellow dwarf virus), leafhoppers (Wheat dwarf virus) or mites (e.g., Wheat streak mosaic virus), will become much more important even in cooler regions. The environmentally most sound and also most cost effective approach to prevent high yield losses caused by these viruses is breeding for resistance. Therefore, in contrast to other reviews on cereal viruses, this study briefly reviews present knowledge on cereal‐infecting viruses and emphasizes especially the sources of resistance or tolerance to these viruses and their use in molecular breeding schemes.

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Strategies of Breeding for Durable Disease Resistance in Cereals

Cited by 7 publications

References 174 publications

Fine mapping and comparative genomics integration of two quantitative trait loci controlling resistance to powdery mildew in a Spanish barley landrace

Fine mapping and comparative genomics integration of two quantitative trait loci controlling resistance to powdery mildew in a Spanish barley landrace

Localisation and combination of resistance genes against soil-borne viruses of barley (BaMMV, BaYMV) using doubled haploids and molecular markers

Virus Resistance in Cereals: Sources of Resistance, Genetics and Breeding

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