Dasypyrum

Pace, C. De; Vaccino, P.; Pasquini, Marina; Bizzarri, Marco; Qualset, C. O.

doi:10.1007/978-3-642-14228-4_4

Cited by 45 publications

(23 citation statements)

References 218 publications

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“…Cytological and molecular evidences suggest significant genomic diversification between the 2 species, and therefore, the genomes of D. villosum and D. breviaristatum were assigned the genomic symbols V and V b , respectively [Gradzielewska, 2006a;Liu et al, 2010]. Within both species of Dasypyrum , several agronomically important traits, including those of disease resistance, high protein quality, and drought tolerance, have been identified and offer valuable resources for wheat improvement [Gradzielewska, 2006b;De Pace et al, 2011]. D. villosum has been extensively hybridized to wheat, and several disease-resistance genes were successfully transferred [Chen et al, 1995;Yildirim et al, 1998;Qi et al, 2011].…”

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confidence: 99%

“…The genus Dasypyrum (or Haynaldia ) consists of 2 species: Dasypyrum villosum and D. breviaristatum. Both species are native to the Mediterranean environment and are distributed in the mountainous regions of Europe and Africa [Gradzielewska, 2006a;De Pace et al, 2011]. Cytological and molecular evidences suggest significant genomic diversification between the 2 species, and therefore, the genomes of D. villosum and D. breviaristatum were assigned the genomic symbols V and V b , respectively [Gradzielewska, 2006a;Liu et al, 2010].…”

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confidence: 99%

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A Novel Wheat-Dasypyrum breviaristatum Substitution Line with Stripe Rust Resistance

Guang-rong¹,

Zhao²,

Li³

et al. 2014

Cytogenet Genome Res

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The introduction of genetic variation from wild and cultivated Triticeae species has been a long-standing approach for wheat improvement. Dasypyrumbreviaristatum species harbor novel and agronomically important genes for resistance against multi-fungal diseases. The development of new wheat-D. breviaristatum introgression lines offers chances for the identification of stripe rust resistance gene(s). A wheat line, D11-5, was selected from a cross between wheat line MY11 and wheat-D. breviaristatum partial amphiploid TDH-2. It was characterized by FISH and PCR-based molecular markers. Chromosome counting revealed that the D11-5 line shows a hexaploid set of 2n = 6x = 42 chromosomes. FISH analysis using the Dasypyrum repetitive sequence pDb12H as a probe demonstrated that D11-5 contained a pair of D. breviaristatum chromosomes, while FISH with wheat D-genomic repetitive sequences revealed that the chromosome 2D was absent in D11-5. The functional molecular markers confirmed that the introduced D. breviaristatum chromosomes belong to the homoeologous group 2, indicating that D11-5 was a 2V^b (2D) disomic substitution line. Field resistance showed that the introduced D. breviaristatum chromosomes 2V^b were responsible for the stripe rust resistance at the adult plant stage. FISH, C-banding, and PCR-based molecular marker analysis indicated that the chromosome 2V^b of D. breviaristatum was completely different from the chromosome 2V of D. villosum. The identified wheat-D. breviaristatum chromosome substitution line D11-5 may be applied to produce agronomically desirable stripe rust resistance germplasm.

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A Novel Wheat-Dasypyrum breviaristatum Substitution Line with Stripe Rust Resistance

Guang-rong¹,

Zhao²,

Li³

et al. 2014

Cytogenet Genome Res

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“…Pm21 has provided effective resistance to a broad spectrum of Bgt races in China and elsewhere since 2002. Rare genetic variation has been observed in a collection of 6V chromosomes of diverse origin for resistance to powdery mildew (4). The discovery of a 6V susceptible introgression stock opens the possibility of recombination-based analysis and further studies on the relationship between Stpk-V and Pm21.…”

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Alien introgressions represent a rich source of genes for crop improvement

Gill

Friebe

White

2011

Proc. Natl. Acad. Sci. U.S.A.

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O ur major crop species represent the relatively few species that were selected by our ancestors from a multitude of extant species, and the resulting narrow germplasm forms the basis of modern monoculture in many areas of the world. Crop monoculture over vast areas inevitably leads to boom and bust cycles alternating between susceptible and resistance genotypes, disease epidemics, and loss of productivity after the appearance of new virulent races of pathogens. Breeders and geneticists have increasingly sought new sources of resistance in diverse germplasm, often involving distant wild relatives. Often, such alien introgressions are accompanied by linkage drag where recombination is suppressed in the target gene region, and standard recombinationbased approaches cannot be used in the molecular dissection of the target genes. In PNAS, Cao et al. (1), however, circumvent the problems and report the isolation of a resistance gene from an alien introgression in wheat using a combination of cytology and gene expression analysis.As a rule, polyploids containing more than two sets of chromosomes have highly buffered genotypes, are more tolerant, and are more likely to benefit from alien introgression than diploids. Common bread wheat (Triticum aestivum L.; 2n = 6x = 42, genomes AABBDD) is hexaploid, consisting of A, B, and D progenitor genomes. Most of the highest yielding wheat cultivars carry portions of alien chromosomal introgression from related weedy species. The process of alien introgression is illustrated in Fig.

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“…tance, high protein quality, and drought tolerance, all of which are valuable resources for global wheat breeding [De Pace et al, 2011]. The species D. villosum has been extensively hybridized with wheat for at least 6 decades.…”

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“…Several disease resistance genes have been successfully transferred to wheat including those effective against powdery mildew ( Pm21 [Chen et al, 1995]; Pm55 ), wheat spindle streak mosaic virus ( Wss1 [Zhang et al, 2005]), and stem rust ( Sr52 ). Cytological and molecular evidence suggested the occurrence of significant genomic diversification between the 2 Dasypyrum species [De Pace et al, 2011;Baum et al, 2014;Li et al, 2016], and research has been conducted with the aim to transfer useful genes from D. breviaristatum into wheat. Subsequently, the wheat-D. breviaristatum partial amphiploid [Yang et al, 2005] and wheat-D. breviaristatum introgression lines with multiple disease resistances were developed [Li et al, 2014[Li et al, , 2016.…”

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confidence: 99%

Characterization of New Wheat-Dasypyrum breviaristatum Introgression Lines with Superior Gene(s) for Spike Length and Stripe Rust Resistance

Wang

Yü

et al. 2018

Cytogenet Genome Res

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Dasypyrum breviaristatum (genome V^bV^b) contains potentially important traits for commercial wheat production. Chromosome 2V^b of D. breviaristatum carries several desirable agronomic characters, including long spike length as well as enhanced resistance to stripe rust, which are expressed in a common wheat background. In this study, wheat-D. breviaristatum 2V^b deletion lines were produced and identified by fluorescence in situ hybridization (FISH), and 74 molecular markers specific to D. breviaristatum chromosome 2V^b were physically localized in 4 distinct chromosomal regions. New wheat-D. breviaristatum 2V^b translocation lines were also characterized by FISH. The breakpoint of the translocation T3AS.3AL-2V^bS was determined by physically mapped molecular markers. Field evaluation revealed that genes affecting plant height and spike length are located on fraction length (FL) 0.65-1.00 of 2V^bS, while the stripe rust resistance gene(s) are located on FL 0.40-1.00 of D. breviaristatum chromosome 2V^bL. The newly characterized wheat-Dasypyrum chromosomal introgressions are of potential value for the improvement of the yield and disease resistance of wheat.

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Dasypyrum

Cited by 45 publications

References 218 publications

A Novel Wheat-<b><i>Dasypyrum breviaristatum </i></b>Substitution Line with Stripe Rust Resistance

A Novel Wheat-<b><i>Dasypyrum breviaristatum </i></b>Substitution Line with Stripe Rust Resistance

Alien introgressions represent a rich source of genes for crop improvement

Characterization of New Wheat-<b><i>Dasypyrum breviaristatum</i></b> Introgression Lines with Superior Gene(s) for Spike Length and Stripe Rust Resistance

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