Cytogenetical Studies in Wheat I. Monosomic Analysis of Leaf Rust Resistance in the Cultivars Uruguay and Transfer

McIntosh, R. A.; Baker, E. P.; Driscoll, C. J.

doi:10.1071/bi9650971

Cited by 17 publications

(8 citation statements)

References 6 publications

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“…This suggests that the genes involved in conditioning resistance in the two stocks may be identical . Following the demonstration that Pm2 is located on chromosome 5D, Federation 4 Ulka was crossed with Uruguay W 1064 which carries Lrl conditioning leaf rust resistance on chromosome 5D (MCINTOSH et al ., 1965) . An F4 line, homozygous for both Pm2 and Lrl, was used as the male parent in a cross with a Chinese Spring plant mono-isosomic for the long arm of chromosome 5D (5DL) .…”

Section: Methodsmentioning

confidence: 99%

Cytogenetical studies in wheat iv. Chromosome location and linkage studies involving thePM2 locus for powdery mildew resistance

McIntosh

Baker

1970

Euphytica

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Section: Methodsmentioning

confidence: 99%

Cytogenetical studies in wheat iv. Chromosome location and linkage studies involving thePM2 locus for powdery mildew resistance

McIntosh

Baker

1970

Euphytica

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“…It is a single, dominant gene that was located on the long arm of chromosome 5DL by monosomic analysis (McIntosh et al 1965). The Lr1 gene is present in a number of wheat cultivars (Knott 1989;McIntosh 1988), and plants containing the Lr1 resistance gene show a typical hypersensitive reaction after infection with an avirulent pathogen race.…”

Section: Communicated By G Wenzelmentioning

confidence: 99%

Identification and genetic characterization of an Aegilops tauschii ortholog of the wheat leaf rust disease resistance gene Lr1

et al. 2004

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Aegilops tauschii (goat grass) is the progenitor of the D genome in hexaploid bread wheat. We have screened more than 200 Ae. tauschii accessions for resistance against leaf rust (Puccinia triticina) isolates,which are avirulent on the leaf rust resistance gene Lrl. Approximately 3.5% of the Ae. tauschii accessions displayed the same low infection type as the tester line Thatcher Lrl. The accession Tr.t. 213, which showed resistance after artificial infection with Lrl isolates both in Mexico and in Switzerland, was chosen for further analysis. Genetic analysis showed that the resistance in this accession is controlled by a single dominant gene,which mapped at the same chromosomal position as Lrl in wheat. It was delimited in a 1.3-cM region between the restriction fragment length polymorphism (RFLP) markers ABC718 and PSR567 on chromosome 5DL of Ae.tauschii. The gene was more tightly linked to PSR567(0.47 cM) than to ABC718 (0.79 cM). These results indicate that the resistance gene in Ae. tauschii accession Tr.t. 213 is an ortholog of the leaf rust resistance gene Lrlof bread wheat, suggesting that Lrl originally evolved in diploid goat grass and was introgressed into the wheat D genome during or after domestication of hexaploidwheat. Compared to hexaploid wheat, higher marker polymorphism and recombination frequencies were ob-served in the region of the Lrl ortholog in Ae. tauschii. The identification of LrlAe, the orthologous gene of wheatLrl, in Ae. tauschii will allow map-based cloning of Lrlfrom this genetically simpler, diploid genome.

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“…umbellulata (Transfer) Radiation treatment, for inducing chromosome breakage and recombining alien chromatin with that of wheat, was first used by Sears (1956), who transferred Lr9 for leaf rust resistance (Soliman et al, 1963;Mclntosh et al, 1965) from the long arm of a group 6 Ae. umbellulata chromosome, 6U#1 (Athwal & Kimber, 1972), to wheat.…”

Section: Transfers Derived From Aegilops Speciesmentioning

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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Cytogenetical Studies in Wheat I. Monosomic Analysis of Leaf Rust Resistance in the Cultivars Uruguay and Transfer

Cited by 17 publications

References 6 publications

Cytogenetical studies in wheat iv. Chromosome location and linkage studies involving thePM2 locus for powdery mildew resistance

Cytogenetical studies in wheat iv. Chromosome location and linkage studies involving thePM2 locus for powdery mildew resistance

Identification and genetic characterization of an Aegilops tauschii ortholog of the wheat leaf rust disease resistance gene Lr1

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

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