scholarly journals Chromosome Location of Mature Plant Leaf Rust Resistance in Chinese Spring Wheat

1966 ◽  
Vol 19 (5) ◽  
pp. 943 ◽  
Author(s):  
RA Mcintosh ◽  
EP Baker
Keyword(s):  
Leaf Rust ◽  
Chinese Spring ◽  
Wheat Cultivar ◽  
Dominant Gene ◽  
Recessive Gene ◽  
Leaf Rust Resistance ◽  
Mature Plant ◽  
Mature Plant Resistance ◽  
Chinese Spring Wheat ◽  
Two Factors

Athwal and Watson (1957) reported that the wheat cultivar Chinese Spring W1806t possessed a single dominant gene for mature plant resistance to leaf rust (Puccinia recondita Rob. ex Desm.) and that this gene was allelic with one of two factors in Uruguay W1064. The second factor in Uruguay, operative in both seedling and mature plant stages, was located on chromosomes 5D(XVIII) (McIntosh, Baker, and Driscoll 1965). Uurau (1950) presented F2 and Fs data for crosses involving certain Chinese Spring monosomic lines with the susceptible cultivar Federation 41. His results were inconclusive in associating resistance with a specific chromosome. The behaviour of the Chinese Spring resistance with regard to dominance has been found to vary in different investigations. In addition to the report of Athwal and Watson, Unrau found that the segregation pattern in crosses with Federation 41 indicated that resistance was governed by a single, incompletely dominant pair. On the other hand, Macindoe (1948) reported that a recessive gene for resistance was involved.

scholarly journals Inheritance of Adult Plant Leaf Rust Resistance in the Brazilian Wheat Cultivar Toropi

Plant Disease ◽  
2000 ◽  
Vol 84 (1) ◽  
pp. 90-93 ◽  
Author(s):  
A. L. Barcellos ◽  
A. P. Roelfs ◽  
M. I. B. de Moraes-Fernandes
Keyword(s):  
Leaf Rust ◽  
Plant Resistance ◽  
Rust Resistance ◽  
Adult Plant Resistance ◽  
Wheat Cultivar ◽  
Dominant Gene ◽  
Recessive Gene ◽  
Leaf Rust Resistance ◽  
Adult Plant ◽  
Recessive Genes

Adult plant resistance to leaf rust in the Brazilian wheat cultivar Toropi (Triticum aestivum) was studied in crosses with the susceptible cultivar IAC 13. Cvs. Toropi and IAC 13 are susceptible at the seedling stage to race LCG-RS of Puccinia triticina Erikss., and to all other known Brazilian leaf-rust races. Thus, the resistance observed in Toropi in the field was due to adult plant-resistance genes. In the greenhouse at the adult plant stage, resistance segregated in a 7:9 ratio for two complementary recessive genes. Additionally, two recessive genes for leaf-tip necrosis were identified in the greenhouse environment. Necrosis was expressed when the two homozygous recessive genes occurred together in the F2, independently of the response to leaf rust. The resistance and leaf-necrosis genes differ from those previously reported in wheat. Segregation for leaf-rust resistance in the field at Passo Fundo, Brazil, fit a 1:3 ratio for a single recessive gene. With a different pathogen race, and in crosses of cvs. Toropi and ThatcherLr34, two recessive genes and a dominant gene for resistance were detected in the field in Mexico. The dominant gene was likely Lr34 from cv. ThatcherLr34 and the two recessive genes were likely those detected in the greenhouse adult plants tests at Passo Fundo.

scholarly journals Postulation of Leaf Rust Resistance Genes in Seven Chinese Spring Wheat Cultivars

2013 ◽  
Vol 12 (9) ◽  
pp. 1580-1588 ◽  
Author(s):  
Li-hong SHI ◽  
Na ZHANG ◽  
Ya-ya HU ◽  
Xue-jun WEI ◽  
Wen-xiang YANG ◽  
...  
Keyword(s):  
Leaf Rust ◽  
Spring Wheat ◽  
Resistance Genes ◽  
Chinese Spring ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Wheat Cultivars ◽  
Chinese Spring Wheat ◽  
Rust Resistance Genes ◽  
Leaf Rust Resistance Genes

scholarly journals Leaf Rust Resistance Gene Lr34 Associated with Nonsuppression of Stem Rust Resistance in the Wheat Cultivar Canthatch

1999 ◽  
Vol 89 (6) ◽  
pp. 518-521 ◽  
Author(s):  
E. R. Kerber ◽  
T. Aung
Keyword(s):  
Leaf Rust ◽  
Resistance Gene ◽  
Stem Rust ◽  
Chinese Spring ◽  
Rust Resistance ◽  
Wheat Cultivar ◽  
Leaf Rust Resistance ◽  
Stem Rust Resistance ◽  
Rust Resistance Gene ◽  
Leaf Rust Resistance Gene

The common wheat cultivar Thatcher and the backcross derivative Canthatch are moderately or fully susceptible to several races of stem rust because of a suppressor on chromosome 7DL that inhibits the expression of the relevant resistance gene(s). The incorporation of leaf rust resistance gene Lr34 into ‘Thatcher’ is known to enhance stem rust resistance. The effect of this gene in a ‘Canthatch’ background and its relationship with the 7DL suppressor were determined by replacing chromosome 7D of ‘Canthatch’ with 7D of ‘Chinese Spring’, which possesses Lr34 on the short arm. ‘Canthatch’ nullisomic 7D was crossed with ‘Chinese Spring’, followed by a succession of backcrosses to the nullisomic recurrent parent. Homozygous resistant disomic and monosomic substitution lines were recovered that exhibited the same resistant reaction as that of ‘Thatcher’ possessing Lr34 and as that of ‘Canthatch’ nullisomic 7D, in which the 7DL suppressor is absent. The results indicate that, in ‘Canthatch’, Lr34 permits expression of resistance genes normally inhibited by the 7DL suppressor. Furthermore, it is likely that, in ‘Thatcher’ and ‘Thatcher’ back-cross derivatives, Lr34 inactivates the 7DL suppressor.

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

1965 ◽  
Vol 18 (5) ◽  
pp. 971 ◽  
Author(s):  
RA Mcintosh ◽  
EP Baker ◽  
CJ Driscoll
Keyword(s):  
Leaf Rust ◽  
Rust Resistance ◽  
Wheat Cultivar ◽  
Dominant Gene ◽  
Leaf Rust Resistance ◽  
Monosomic Analysis ◽  
Physiological Resistance

The dominant gene for physiological resistance in the wheat cultivar Uruguay to certain Australian strains of leaf rust was located on chromosome 5D by the F2 method of monosomic analysis. The gene responsible for resistance in the cultivar Transfer was confirmed to be on chromosome 6B. Possible mechanisms producing aberrant F2 ratios involving Transfer in crosses with certain susceptible cultivars are discussed.

THE GENETICS OF TWO ALLELES FOR LEAF RUST RESISTANCE AT THE LR14 LOCUS IN WHEAT

1970 ◽  
Vol 12 (4) ◽  
pp. 689-694 ◽  
Author(s):  
P. L. Dyck ◽  
D. J. Samborski
Keyword(s):  
Leaf Rust ◽  
Rust Resistance ◽  
Dominant Gene ◽  
Wheat Variety ◽  
Recessive Gene ◽  
Leaf Rust Resistance ◽  
The Other ◽  
Single Line

Two genes conferring a similar mesothetic reaction to different races of leaf rust were backcrossed into the wheat variety Thatcher. One of the genes came from Selkirk and the other from Maria Escobar and Bowie. The two genes are alleles at the Lr14 locus, but have been combined into a single line. The inheritance of pathogenicity on these two alleles was studied by using an F2 population of 150 cultures from a cross between races 9 and 161 of leaf rust. Virulence on Lr14a was conferred by a recessive gene and on Lr14b by a dominant gene. These genes for virulence are independently inherited.

scholarly journals Genes Governing Resistance to Puccinia hordei in Thirteen Spring Barley Accessions

2000 ◽  
Vol 90 (10) ◽  
pp. 1131-1136 ◽  
Author(s):  
W. S. Brooks ◽  
C. A. Griffey ◽  
B. J. Steffenson ◽  
H. E. Vivar
Keyword(s):  
Leaf Rust ◽  
Resistance Gene ◽  
Rust Resistance ◽  
Spring Barley ◽  
Dominant Gene ◽  
Recessive Gene ◽  
Leaf Rust Resistance ◽  
Puccinia Hordei ◽  
Preliminary Evaluation ◽  
Sources Of Resistance

Leaf rust, caused by Puccinia hordei, is an important disease of barley in many parts of the world. In the eastern United States, this disease was effectively controlled for over 20 years through the deployment of cultivars carrying the resistance gene Rph7. Isolates of P. hordei with virulence for Rph7 appeared in this region in the early 1990s rendering barley cultivars with this gene vulnerable to leaf rust infection. From a preliminary evaluation test, 13 accessions from diverse geographic locations possessed resistance to P. hordei isolate VA90-34, which has virulence for genes Rph1, 2, 4, 6, 7, 8, and 11. Each of these 13 accessions was crossed with susceptible cvs. Moore or Larker to characterize gene number and gene action for resistance to P. hordei. Additionally, the 13 accessions were intercrossed and crossed to host differential lines possessing genes Rph3, Rph5, and Rph9 to determine allelic relationships of resistance genes. Seedlings of F1, F2, and BC1F1 populations were evaluated in the greenhouse for their reaction to P. hordei isolate VA90-34. Leaf rust resistance in six of the accessions including Collo sib, CR270.3.2, Deir Alla 105, Giza 119, Gloria, and Lenka is governed by a single dominant gene located at or near the Rph3 locus. All accessions for which the gene Rph3 was postulated to govern leaf rust resistance, except for Deir Alla 105, likely possess an allele different than Rph3.c found in Estate based on the differential reaction to isolates of P. hordei. The resistance gene in Grit and Donan is located at or near the Rph9 locus. Alleles at both the Rph3 and Rph9 loci confer resistance in Femina and Dorina. In addition to Rph3, Caroline and CR366.13.2 likely possess a second unknown recessive gene for leaf rust resistance. Resistance in Carre 180 is governed by a recessive gene that is different from all other genes considered in this study. Identification of both known and unique genes conferring leaf rust resistance in the barley germplasm included in this study provides breeding programs with the knowledge and opportunity to assess currently used sources of leaf rust resistance and to incorporate new sources of resistance into their programs.

LEAF RUST RESISTANCE OF TRANSEC WHEAT

1969 ◽  
Vol 11 (3) ◽  
pp. 493-496 ◽  
Author(s):  
N. H. Luig
Keyword(s):  
Leaf Rust ◽  
Plant Resistance ◽  
Chinese Spring ◽  
Rust Resistance ◽  
Adult Plant Resistance ◽  
Leaf Rust Resistance ◽  
Dominant Factor ◽  
Translocation Line ◽  
Adult Plant ◽  
Two Factors

The same single dominant factor in the wheat-rye translocation line Transec controls resistance to Australian leaf rust strains in the seedling and adult plant stages. Transec did not derive the major factor for adult plant resistance from its Chinese Spring parent. The two factors which are both on chromosome 4A appear to be loosely linked.

scholarly journals Cytogenetic analysis and mapping of leaf rust resistance in Aegilops speltoides Tausch derived bread wheat line Selection2427 carrying putative gametocidal gene(s)

Genome ◽  
2017 ◽  
Vol 60 (12) ◽  
pp. 1076-1085 ◽  
Author(s):  
M. Niranjana ◽  
Vinod ◽  
J.B. Sharma ◽  
Niharika Mallick ◽  
S.M.S. Tomar ◽  
...  
Keyword(s):  
Leaf Rust ◽  
Bread Wheat ◽  
Rust Resistance ◽  
Dominant Gene ◽  
Puccinia Triticina ◽  
Leaf Rust Resistance ◽  
Aegilops Speltoides ◽  
Lr Genes ◽  
Gametocidal Gene ◽  
Chromosome 3B

Leaf rust (Puccinia triticina) is a major biotic stress affecting wheat yields worldwide. Host-plant resistance is the best method for controlling leaf rust. Aegilops speltoides is a good source of resistance against wheat rusts. To date, five Lr genes, Lr28, Lr35, Lr36, Lr47, and Lr51, have been transferred from Ae. speltoides to bread wheat. In Selection2427, a bread wheat introgresed line with Ae. speltoides as the donor parent, a dominant gene for leaf rust resistance was mapped to the long arm of chromosome 3B (LrS2427). None of the Lr genes introgressed from Ae. speltoides have been mapped to chromosome 3B. Since none of the designated seedling leaf rust resistance genes have been located on chromosome 3B, LrS2427 seems to be a novel gene. Selection2427 showed a unique property typical of gametocidal genes, that when crossed to other bread wheat cultivars, the F1 showed partial pollen sterility and poor seed setting, whilst Selection2427 showed reasonable male and female fertility. Accidental co-transfer of gametocidal genes with LrS2427 may have occurred in Selection2427. Though LrS2427 did not show any segregation distortion and assorted independently of putative gametocidal gene(s), its utilization will be difficult due to the selfish behavior of gametocidal genes.

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