Biotic Stress in Barley: Insect Problems and Solutions

Mornhinweg, D. W.

doi:10.1002/9780470958636.ch12

Cited by 10 publications

(11 citation statements)

References 208 publications

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“…This group included STARS9577B, which has been used as a resistance source in two of the four USA1 resistant cultivars (Mornhinweg, 2011). This group included STARS9577B, which has been used as a resistance source in two of the four USA1 resistant cultivars (Mornhinweg, 2011).…”

Section: Discussionmentioning

confidence: 99%

“…In total, 23 lines showed resistance to all five RWA biotypes. This group included STARS9577B, which has been used as a resistance source in two of the four USA1 resistant cultivars (Mornhinweg, 2011). STARS9301B, which was not included in the 145 lines with data for all five biotypes, is the source of resistance for the other USA1 resistant cultivars and would also presumably be resistant to all five biotypes since it contains the two major loci associated with resistance in STARS9577B (Mittal et al, 2008(Mittal et al, , 2009).…”

Section: Discussionmentioning

confidence: 99%

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Biotype Differences for Resistance to Russian Wheat Aphid in Barley

et al. 2014

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Russian wheat aphid [RWA; Diuraphis noxia (Mordvilko)] is a worldwide insect pest of barley (Hordeum vulgare L.), causing crop losses each year. Previously identified resistant barley lines do not show variable reactions to the eight United States RWA biotypes identified by wheat reactions. However, additional RWA isolates have been identified outside the United States. The objective of this research was to determine whether additional RWA biotypes that impact resistance in barley exist and whether resistance to these biotypes is present in the resistant barley germplasm and cultivars that have been developed by the USDA‐ARS. A total of 166 barley lines were rated for chlorosis and leaf rolling in response to infestation with RWA United States’ biotype 1 and to individual isolates from Hungary, Chile, Mexico, and Iran. Each barley line was genotyped for 5912 single nucleotide polymorphism (SNP) markers, and the combined data were used for association mapping of loci associated with resistance to each RWA isolate. A total of 40 loci were associated with resistance to the five RWA isolates. Biotype differences were evident, with only 23 lines showing resistance to all five biotypes. Loci with large effects on mean chlorosis and rolling differences were found for resistance to biotypes from the United States, Hungary, and Chile, while the loci for resistance to biotypes from Mexico and Iran had small effects on these traits, which may pose problems for developing resistant germplasm. The 23 lines resistant to all biotypes included 10 unadapted germplasm accessions and 13 improved germplasm lines and provide useful germplasm for developing new barley cultivars with resistance to multiple RWA biotypes.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Biotype Differences for Resistance to Russian Wheat Aphid in Barley

et al. 2014

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“…This was confirmed by mapping studies of two biparental mapping populations (STARS9301B  Morex and STARS9577B  Morex), which showed the same two loci on chromosomes 1H and 3H in both R parents plus another locus on 2H in STARS9301B (Mittal et al, 2008(Mittal et al, , 2009). Many other resistance sources have been used for breeding improved RWA-resistant germplasm (Mornhinweg, 2011), but limited knowledge of the genetic diversity among the R accessions used as parents likely resulted in genetic redundancy for RWA resistance within these new germplasm lines.…”

Section: Genetic Diversity For Russian Wheat Aphid Resistance As Detementioning

confidence: 99%

“…ReseaRch R ussian wheat aphid has become a common pest on barley around the world that can severely damage barley yield and grain quality, and RWA is difficult to effectively and economically control with insecticides (Mornhinweg, 2011). Fortunately, highly effective genetic resistance is available (Bregitzer et al, 2003), and agronomically unadapted R and MR accessions have been identified in the USDA-ARS National Small Grains Collection (http://ars.usda.gov/Main/docs.htm?docid = 21891).…”

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confidence: 99%

Genetic Diversity for Russian Wheat Aphid Resistance as Determined by Genome‐Wide Association Mapping and Inheritance in Progeny

Dahleen¹,

Bregitzer

Mornhinweg

et al. 2015

Crop Science

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Russian wheat aphid (RWA) [Diuraphis noxia (Mordvilko)] is an increasing problem on barley (Hordeum vulgare L.) throughout the world. Genetic resistance has been identified and used to create barley germplasm and cultivars adapted to the United States. Several mapping studies have been conducted to identify loci associated with resistance, but questions remain, particularly regarding the extent of genetic diversity among resistance sources and improved lines and cultivars. Association analysis of resistant (R) and moderately resistant (MR), unadapted accessions held in the USDA–ARS National Small Grains Germplasm Collection, adapted germplasm lines derived from these accessions, and susceptible (S) elite cultivars was conducted using 4509 single nucleotide polymorphisms (SNPs) to identify markers linked to resistance. Resistance was associated with loci on chromosomes 1H, 2H, 3H, 5H, and 7H at p‐values <0.0001, and the major 1H and 3H loci identified in previous tests were confirmed. However, the genetics of RWA resistance was shown to be complex, and it is likely that loci involved in resistance in some lines were not identified. Nevertheless, this analysis identified diversity among R lines and showed that most of the released RWA‐resistant cultivars had similar genotypes at loci associated with resistance. This analysis also identified R lines that were genetically dissimilar to the released cultivars at these loci. This information can guide parental selection for future breeding efforts designed to capture and deploy greater diversity for RWA resistance among new barley cultivars.

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“…Wild species are also important sources of RWA resistance. Of the known RWA resistance genes, Dn7 , identified in rye cultivar Turkey 77 and transferred to a 1BL/1RS translocation segment in bread wheat line 93M370 (Marais et al, 1994), exhibited the highest level of resistance to all known RWA biotypes (Puterka et al, 2006; Mornhinweg 2012). The RWA resistance gene in STARS 02RWA2414‐11, Dn2414 , was also mapped to a 1RS segment.…”

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confidence: 99%

Dn10, a New Gene Conferring Resistance to Russian Wheat Aphid Biotype 2 in Iranian Wheat Landrace PI 682675

Carver

et al. 2018

Crop Science

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Russian wheat aphid [RWA, Diuraphis noxia (Mordvilko)] is a serious pest of wheat (Triticum aestivum L.) and barley (Hordeum vulgare L.) that causes heavy yield losses in many countries, and RWA biotype 2 (RWA2) is virulent to most RWA resistance genes. The objective of this study was to characterize a gene for resistance to RWA2 in Iranian landrace PI 682675, a single‐plant selection from PI 624151. F2:3 and F3:4 families derived from cross PI 682675 × Zhengyou 6 were used to map the resistance gene. PI 682675 carries a dominant resistance gene, Dn10, flanked by simple sequence repeat markers Xgwm437 and Xwmc488 on chromosome 7DL. Physical mapping indicated that Dn10 resides in bin 7DL 0.1 to 0.77, whereas Dn2401 and Dn626580 that also confer resistance to RWA2 were physically mapped to 7DS. Allelism tests showed that Dn10 was located ∼17.4 cM from Dn2401 and 22.2 cM from Dn626580. Dn10 is a new resistance gene that should be used widely in wheat breeding.

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Biotic Stress in Barley: Insect Problems and Solutions

Cited by 10 publications

References 208 publications

Biotype Differences for Resistance to Russian Wheat Aphid in Barley

Biotype Differences for Resistance to Russian Wheat Aphid in Barley

Genetic Diversity for Russian Wheat Aphid Resistance as Determined by Genome‐Wide Association Mapping and Inheritance in Progeny

Dn10, a New Gene Conferring Resistance to Russian Wheat Aphid Biotype 2 in Iranian Wheat Landrace PI 682675

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