A Cryptic Wheat–<i>Aegilops triuncialis</i> Translocation with Leaf Rust Resistance Gene <i>Lr58</i>

Kuraparthy, Vasu; Sood, Shilpa; Chhuneja, Parveen; Dhaliwal, H. S.; Kaur, Satinder; Bowden, Robert L.; Gill, Bikram S.

doi:10.2135/cropsci2007.01.0038

Cited by 84 publications

(57 citation statements)

References 53 publications

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“…Recently, researchers have identified a few disease-resistant alien translocation lines with cytologically undetectable alien segments, which were called "cryptic alien introgressions" (Kuraparthy et al, 2007b;He et al, 2009;Luo et al, 2009). In the present study, two markers flanked YrSn0096 on the long arm of chromosome 4A, whereas GISH mapped a small alien segment to the short arm of a wheat chromosome.…”

Section: Discussionmentioning

confidence: 99%

Molecular cytogenetic identification of a wheat (Triticum aestivum)-American dune grass (Leymus mollis) translocation line resistant to stripe rust

Bao

Wang²,

He³

et al. 2012

Genet. Mol. Res.

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ABSTRACT. Leymus mollis, a perennial allotetraploid (2n = 4x = 28), known as American dune grass, is a wild relative of wheat that could be useful for cultivar improvement. Shannong0096, developed from interspecific hybridization between common wheat cv. Yannong15 and L. mollis, was analyzed with cytological procedures, genomic in situ hybridization, stripe-rust resistance screening and molecular marker analysis. We found that Shannong0096 has 42 chromosomes in the root-tip cells at mitotic metaphase and 21 bivalents in the pollen mother cells at meiotic metaphase I, demonstrating cytogenetic stability. Genomic in situ hybridization probed with total genomic DNA from L. mollis gave strong hybridization signals in the distal ©FUNPEC-RP www.funpecrp.com.br Identification of a wheat-Leymus mollis translocation Genetics and Molecular Research 11 (3): 3198-3206 (2012) 3199region of two wheat chromosome arms. A single dominant Yr gene, derived from L. mollis and temporarily designated as YrSn0096, was found on the long arm of chromosome 4A of Shannong0096. YrSn0096 should be a novel Yr gene because none of the previously reported Yr genes on chromosome 4A are related to L. mollis. This gene was found to be closely linked to the loci Xbarc236 and Xksum134 with genetic distances of 5.0 and 4.8 cM, respectively. Based on data from 267 F 2 plants of Yannong15/Huixianhong, the linkage map of YrSn0096, using the two molecular markers, was established in the order Xbarc236-YrSn0096-Xksum134. Shannong0096 appeared to be a unique wheat-L. mollis translocation with cryptic alien introgression. Cytogenetic stability, a high level of stripe-rust resistance, the common wheat background, and other positive agronomic traits make it a desirable donor for introducing novel alien resistance genes in wheat breeding programs, with the advantage of molecular markers that can be used to confirm introgression.

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Section: Discussionmentioning

confidence: 99%

Molecular cytogenetic identification of a wheat (Triticum aestivum)-American dune grass (Leymus mollis) translocation line resistant to stripe rust

Bao

Wang²,

He³

et al. 2012

Genet. Mol. Res.

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“…Traits of interest can be transferred to the recipient crop without cytological changes in its genomic constitution [82], implying that the introgressed chromatin segments are cryptic. This type of translocation, known as cryptic translocation, cannot be detected by cytological techniques, and molecular methods must be used [83]. Although the mechanism for the occurrence of such cryptic translocations is unknown, their occurrence seems frequent [84].…”

Section: Alien Genetic Resources and The Prospect Of Wheat Fhb Resistmentioning

confidence: 99%

Controlling fusarium head blight of wheat (triticum aestivum L.) with genetics

Zhang¹,

Luo²,

Ren³

et al. 2011

ABB

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Fusarium head blight, one of the most destructive diseases of wheat (Triticum aestivum L.), results in significant economic losses from reduced grain yield and quality. In recent decades, the disease has been frequently recorded, especially under warm and wet climatic conditions. Genetic resistance has engaged plant breeders because the use of resistant cultivars is the most economical, effective, and environmentally friendly method of control. In the present paper, we summarize the research on resistance genetics of Fusarium head blight, suggest a new method for evaluating Fusarium head blight resistance, and recommend strategies for creating and developing new sources of resistance to Fusarium head blight through the use of alien genes and chromosomal segments.

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“…Most of these translocations, despite carrying useful alien genes, have a questionable value for wheat improvement because the large transferred chromosome segments do not adequately compensate for the wheat genes they replace or they carry additional genes conferring undesirable traits. However, in a few instances, traits of interest were transferred to recipient genotypes without inducing detectable cytological or genetic changes (Dong et al 2004;He et al 2009;Kuraparthy et al 2007;Luo et al 2009b;Multani et al 1994;Ren and Zhang 1997). The results of the SSR analysis showed that YU24 and YU25 amplified wheat-specific products evenly distributed over all chromosomal arms.…”

Section: Susceptible Reactionmentioning

confidence: 99%

A new stripe rust resistance gene transferred from Thinopyrum intermedium to hexaploid wheat (Triticum aestivum)

Luo¹,

Hu²,

Chang³

et al. 2010

phyto

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Wheat stripe rust (Puccinia striiforis f. sp. tritici) races CYR31 and CYR32, prevalent in China, are virulent to many wheat stripe rust resistance genes (Yr genes). To expand the availability of effective resistance to CYR31 and CYR32, stripe rust resistance was transferred from intermediate wheatgrass (Thinopyrum intermedium) to common wheat (Triticum aestivum). The susceptible wheat cultivar CM107 was crossed with amphiploid TAI7047, derived from the wide cross Taiyuan768/Thinopyrum intermedium//76(64). Two wheat lines originating from the cross, YU24 and YU25, were resistant to CYR31 and CYR32. Pedigree analysis showed that the resistance to stripe rust in YU24 and YU25 originated from intermediate wheatgrass. Genetic analyses indicated that the resistance to stripe rust is controlled by a single dominant gene. Allelic tests determined that the resistance gene(s) in YU24 and YU25 are identical. The new gene has temporarily been designated as YrYU25. SSR and RAPD analyses showed that YrYU25 was introduced by cryptic translocation into common wheat.

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A Cryptic Wheat–Aegilops triuncialis Translocation with Leaf Rust Resistance Gene Lr58

Cited by 84 publications

References 53 publications

Molecular cytogenetic identification of a wheat (Triticum aestivum)-American dune grass (Leymus mollis) translocation line resistant to stripe rust

Molecular cytogenetic identification of a wheat (Triticum aestivum)-American dune grass (Leymus mollis) translocation line resistant to stripe rust

Controlling fusarium head blight of wheat (triticum aestivum L.) with genetics

A new stripe rust resistance gene transferred from Thinopyrum intermedium to hexaploid wheat (Triticum aestivum)

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