Cytogenetical studies in wheat XVI. Chromosome location of a new gene for resistance to leaf rust in a Japanese wheat-rye translocation line

McIntosh, R. A.; Friebe, Bernd; Jiang, Jiming; Gill, Bikram S.

doi:10.1007/bf00027060

Cited by 57 publications

(38 citation statements)

References 17 publications

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“…As QLr.sfr-1BS proved to be effective in different genetic backgrounds and was mapped very close (less than 1 cM) to Xgwm604, this marker would be suitable for marker assisted selection for leaf rust resistance. Other mapping studies have identified the leaf rust resistance gene Lr26, which was derived from a 1B/ 1R wheat-rye translocation, on chromosome arm 1BS (McIntosh et al 1995a;Mago et al 2002). Furthermore, a major leaf rust resistance QTL located on 1BS was also detected in the CIMMYT spring wheat germplasm (William et al 1997).…”

Section: Discussionmentioning

confidence: 95%

Dissection of quantitative and durable leaf rust resistance in Swiss winter wheat reveals a major resistance QTL in the Lr34 chromosomal region

Schnurbusch

Paillard

Schori³

et al. 2003

Theor Appl Genet

116

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The Swiss winter bread wheat cv. 'Forno' has a highly effective, durable and quantitative leaf rust ( Puccinia triticina Eriks.) resistance which is associated with leaf tip necrosis (LTN). We studied 240 single seed descent lines of an 'ArinaxForno' F(5:7 )population to identify and map quantitative trait loci (QTLs) for leaf rust resistance and LTN. Percentage of infected leaf area (%) and the response to infection (RI) were evaluated in seven field trials and were transformed to the area under the disease progress curves (AUDPC). Using composite interval mapping and LOD >4.4, we identified eight chromosomal regions specifically associated with resistance. The largest and most consistent leaf rust resistance locus was identified on the short arm of chromosome 7D (32.6% of variance explained for AUDPC_% and 42.6% for AUDPC_RI) together with the major QTL for LTN ( R(2)=55.6%) in the same chromosomal region as Lr34 ( Xgwm295). A second major leaf rust resistance QTL ( R(2)=28% and 31.5%, respectively) was located on chromosome arm 1BS close to Xgwm604 and was not associated with LTN. Additional minor QTLs for LTN (2DL, 3DL, 4BS and 5AL) and leaf rust resistance were identified. These latter QTLs might correspond to the leaf rust resistance genes Lr2 or Lr22 (2DS) and Lr14a (7BL).

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Section: Discussionmentioning

confidence: 95%

Dissection of quantitative and durable leaf rust resistance in Swiss winter wheat reveals a major resistance QTL in the Lr34 chromosomal region

Schnurbusch

Paillard

Schori³

et al. 2003

Theor Appl Genet

116

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“…C-banding and GISH analyses located the leaf rust resistance gene, designated Lr45, on the wheat-rye translocation chromosome T2AS-2R#3S.2R#3L (Figure 25), which consists of the long arm of 2R, a 1.71 #m long segment of the short arm of 2R, and a distal 2.68 #m long segment of 2AS. Because meiotic pairing analysis, as discussed above, revealed that the rye segment in the Transec translocation, having Lr25, was derived from 2RL it remains to be shown that the leaf rust resistance gene Lr45 in the T2AS-2R#3S.2R#3L translocation line is different from Lr25.The breakpoint is at FL 0.39 (Table 4) (McIntosh et al, 1995a). Although the T2AS-2R#3S.2R#3L translocation is of the compensating type, its male transmission frequency is reduced.…”

Section: Lr25/pm7 (Transec)mentioning

confidence: 99%

Characterization of wheat-alien translocations conferring resistance to diseases and pests: current status

et al. 1996

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Wild relatives of common wheat, Triticum aestivum, and related species are an important source of disease and pest resistance and several useful traits have been transferred from these species to wheat. C-banding and in situ hybridization analyses are powerful cytological techniques allowing the detection of alien chromatin in wheat. Cbanding permits identification of the wheat and alien chromosomes involved in wheat-alien translocations, whereas genomic in situ hybridization analysis allows determination of their size and breakpoint positions. The present review summarizes the available data on wheat-alien transfers conferring resistance to diseases and pests. Ten of the 57 spontaneous and induced wheat-alien translocations were identified as whole arm translocations with the breakpoints within the centromeric regions. The majority of transfers (45) were identified as terminal translocations with distal alien segments translocated to wheat chromosome arms. Only two intercalary wheat-alien transloctions were identified, one induced by radiation treatment with a small segment of rye chromosome 6RL (H25) inserted into the long arm of wheat chromosome 4A, and the other probably induced by homoeologous recombination with a segment derived from the long arm of a group 7 Agropyron elongatum chromosome with Lrl9 inserted into the long arm of 7D. The presented information should be useful for further directed chromosome engineering aimed at producing superior germplasm.

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“…Important wheat leaf rust resistance genes have been located on specific wheat chromosomes since Sears introduced this mapping method approximately 70 years ago (Sears, 1939). These genes include Lr18 on chromosome 1A (Bai et al, 1998); Lr45 on chromosome 2A (McIntosh et al, 1995); genes resistant to P. triticina, P. graminis, P. striiformis, and Erysiphe graminis on chromosome 2A (Bariana and McIntosh, 1993); 2 inserted chromosomal segments carrying resistance genes to leaf rust and greenbug initially located on chromosome 7S of Triticum speltoides and then transferred to chromosome 7A of hexaploid wheat (Dubcovsky et al, 1998), and Lr39 introgressed from Aegilops tauschii on chromosome 2D (Raupp et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Monosomic and molecular mapping of adult plant leaf rust resistance genes in the Brazilian wheat cultivar Toropi

Silva¹,

Brammer²,

Guerra³

et al. 2012

Genet. Mol. Res.

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ABSTRACT. Leaf rust is one of the most destructive diseases affecting wheat worldwide. The most effective way to control it is to use resistant cultivars. Resistance based on slow-rusting adult plant resistance (APR) genes has proven to be the best method for developing cultivars with durable resistance. A source of slow-rusting APR for leaf rust is the Brazilian wheat cultivar Toropi. The Toropi/IAC 13 F 2 and F 7 recombinant inbred lines (RILs) were developed in previous studies. Phenotypic analysis of the F 2 and F 7 RILs showed that 2 recessive genes that were temporarily named trp-1 and trp-2 conferred APR in Toropi. In the present study, we used monosomic families and amplified fragment length polymorphism (AFLP), sequence-tagged site, and simple sequence repeat (SSR) markers to map trp-1 and trp-2 on wheat chromosomes. Analysis of the F 2 monosomic RIL showed that trp-1 and trp-2 were located on chromosomes 1A and 4D, respectively. AFLP analysis of the F 7 RIL identified 2 independent AFLP markers, XPacgMcac3 and XPacgMcac6, which were associated with Toropi APR. These markers explained 71.5% of the variation in the phenotypic data in a multiple linear regression model. The AFLP markers XPacg/ Mcac3 and XPacg/Mcac6 were anchored by SSR markers previously mapped on the short arms of chromosomes 1A (1AS) and 4D (4DS), respectively. The trp-2 gene is the first leaf rust resistance gene mapped on wheat chromosome 4DS. The mapping of trp-1 and trp-2 provides novel and valuable information that could be used in future studies involving the fine mapping of these genes, as well as in the identification of molecular markers that are closely related to these genes for markerassisted selection of this important trait in wheat.

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Cytogenetical studies in wheat XVI. Chromosome location of a new gene for resistance to leaf rust in a Japanese wheat-rye translocation line

Cited by 57 publications

References 17 publications

Dissection of quantitative and durable leaf rust resistance in Swiss winter wheat reveals a major resistance QTL in the Lr34 chromosomal region

Dissection of quantitative and durable leaf rust resistance in Swiss winter wheat reveals a major resistance QTL in the Lr34 chromosomal region

Characterization of wheat-alien translocations conferring resistance to diseases and pests: current status

Monosomic and molecular mapping of adult plant leaf rust resistance genes in the Brazilian wheat cultivar Toropi

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