Suppressed recombination rate in 6VS/6AL translocation region carrying the Pm21 locus introgressed from Haynaldia villosa into hexaploid wheat

Xie, Wanzhuo; Ben‐David, Roi; Zeng, Bin; Dinoor, A.; Xie, Chaojie; Sun, Qixin; Röder, Marion S.; Fahoum, Amalid; Fahima, Tzion

doi:10.1007/s11032-011-9557-y

Cited by 40 publications

(13 citation statements)

References 44 publications

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“…It was shown that recombination greatly increased from the centromere toward the telomeres on chromosome 6A ( p oursarebani et al 2014), as expected for plants with large genomes. Moreover, it was shown that a recent translocation (6VS:6AL) led to a suppression of recombination rate on 6AL ( x ie et al 2012), which could be due to the knockout of a locus involved in recombination.…”

Section: Discussionmentioning

confidence: 99%

Wheat Landrace Genome Diversity

et al. 2017

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Section: Discussionmentioning

confidence: 99%

Wheat Landrace Genome Diversity

et al. 2017

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“…Breeding for resistance is the most profitable and environmentally acceptable strategy to control powdery mildew. More than 60 powdery mildew resistance genes located at 41 loci (Pm1-Pm45, Pm18 = Pm1c, Pm22 = Pm1e, Pm23 = Pm4c, Pm31 = Pm21) (Ma et al 2011;Hsam et al 1998;Singrün et al 2003;Hao et al 2008;Xie et al 2011) have been identified and designated in wheat and its wild relatives.…”

Section: Introductionmentioning

confidence: 99%

High-density mapping and marker development for the powdery mildew resistance gene PmAS846 derived from wild emmer wheat (Triticum turgidum var. dicoccoides)

Xue

Wang

et al. 2012

Theor Appl Genet

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Powdery mildew, caused by Blumeria graminis f. sp. tritici, is an important foliar disease of wheat worldwide. The dominant powdery mildew resistance gene PmAS846 was transferred to the hexaploid wheat lines N9134 and N9738 from wild emmer wheat (Triticum dicoccoides) in 1995, and it is still one of the most effective resistance genes in China. A high resolution genetic map for PmAS846 locus was constructed using two F(2) populations and corresponding F(2:3) families developed from the crosses of N9134/Shaanyou 225 and N9738/Huixianhong. Synteny between wheat and Brachypodium distachyon and rice was used to develop closely linked molecular markers to reduce the genetic interval around PmAS846. Twenty-six expressed sequence tag-derived markers were mapped to the PmAS846 locus. Five markers co-segregated with PmAS846 in the F(2) population of N9134/Shaanyou 225. PmAS846 was physically located to wheat chromosome 5BL bin 0.75-0.76 within a gene-rich region. The markers order is conserved between wheat and Brachypodium distachyon, but rearrangements are present in rice. Two markers, BJ261635 and CJ840011 flanked PmAS846 and narrowed PmAS846 to a region that is collinear with 197 and 112 kb genomic regions on Brachypodium chromosome 4 and rice chromosome 9, respectively. The genes located on the corresponding homologous regions in Brachypodium, rice and barley could be considered for further marker saturation and identification of potential candidate genes for PmAS846. The markers co-segregating with PmAS846 provide a potential target site for positional cloning of PmAS846, and can be used for marker-assisted selection of this gene.

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“…This high degree of polymorphism could be the result of an introgression event, which caused incomplete chromosome paring that inhibits recombination between the sunflower and alien chromosomes in this specific region. Suppressed recombination has also been observed in other introgressed regions associated with disease resistance, such as Sr 22 (Paull et al1994), Pm 12 (Jia et al 1996), Lr 20 -Pm 1 (Neu et al 2002), and Pm 21 (Xie et al 2012) in wheat and Mla in barley (Wei et al 1999). Similar to the rust gene cluster in LG13, Lr 20 -Pm 1 and Mla are also located on the distal regions of the wheat 7A long arm and barley 5H short arm, respectively.…”

Section: Discussionmentioning

confidence: 99%

Map saturation and SNP marker development for the rust resistance genes (R 4 , R 5 , R 13a , and R 13b ) in sunflower (Helianthus annuus L.)

Long

et al. 2015

Mol Breeding

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Sunflower rust, which is incited by the fungus Puccinia helianthi Schwein., is the most common disease in Australia, Argentina, South Africa, and North America. Three independent genes, R 5 , R 4 , and R 13 with two alleles R 13a and R 13b , were discovered in sunflower and are promising sources of resistance to rust. R 5 was previously mapped to linkage group (LG) 2, and R 4 and R 13 were mapped to LG13 of the sunflower genome using simple sequence repeat (SSR) markers. The objective of this study was to finely map R 5 , R 4 , R 13a , and R 13b using newly developed single nucleotide polymorphism (SNP) markers in four F 2 populations previously used for SSR mapping. Of the 67 LG2 SNP markers screened, two SNPs, SFW03654 and NSA_000267, flanked R 5 at a genetic distance of 0.6 and 1.2 cM, respectively. This flanking narrowed the genetic interval containing R 5 from 5.1 to 1.8 cM in length. A total of 69 LG13 SNP markers were analyzed in the R 4 , R 13a , and R 13b populations. In the R 4 consensus map, the gene R 4 was flanked by seven SNP loci; three co-segregating SNPs are on one side (0.7 cM proximal) and four on the other side (0.6 cM distal). Similarly, SNP markers that are tightly linked to both R 13a and R 13b were identified. R 13a was flanked by SNP markers at genetic distances of 0.4 and 0.2 cM. The SNP SFW00757 cosegregated with R 13b , and another three co-segregating SNPs were 2.4 cM proximal to R 13b . A total of 368 F 2 plants from the cross between a resistant BC 3 F 2 plant carrying R 5 with HA-R6 carrying R 13a were first screened by SSR markers to identify ''double-resistant'' lines. Twelve F 2 plants were identified to be homozygous for a combination of R 5 and R 13a , which was further confirmed with additional SNP markers developed in the present study. The double-resistant line developed in this study may provide a source of durable resistance to manage rust in confection sunflower production and will help mitigate selection pressure on each gene by the pathogen.

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Suppressed recombination rate in 6VS/6AL translocation region carrying the Pm21 locus introgressed from Haynaldia villosa into hexaploid wheat

Cited by 40 publications

References 44 publications

Wheat Landrace Genome Diversity

Wheat Landrace Genome Diversity

High-density mapping and marker development for the powdery mildew resistance gene PmAS846 derived from wild emmer wheat (Triticum turgidum var. dicoccoides)

Map saturation and SNP marker development for the rust resistance genes (R 4 , R 5 , R 13a , and R 13b ) in sunflower (Helianthus annuus L.)

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