INHERITANCE OF VIRULENCE IN WHEAT LEAF RUST ON THE STANDARD DIFFERENTIAL WHEAT VARIETIES

1968 ◽  
Vol 10 (1) ◽  
pp. 24-32 ◽  
Author(s):  
D. J. Samborski ◽  
P. L. Dyck
Keyword(s):  
Leaf Rust ◽  
Dominant Gene ◽  
Recessive Gene ◽  
The Other ◽  
Wheat Leaf Rust ◽  
Single Recessive Gene ◽  
Wheat Varieties ◽  
Wheat Leaf ◽  
Recessive Genes ◽  
Race 1

Populations of self-fertilized cultures from races 1, 9, 15 and 161 of wheat leaf rust were studied for inheritance of virulence on the eight standard differential wheat varieties. Race 9 was homozygous at all loci tested while the other races segregated at a number of loci. Recessive genes controlled virulence on the varieties Malalkof (gene Lr1) and Hussar (gene Lr11) respectively. Virulence to Mediterranean and Democrat was governed by a single recessive gene in race 1 and a single dominant gene in race 161. One recessive gene in races 1 and 15 governed virulence to the various alleles of the Lr2 locus, while in race 161 a second dominant gene altered the expression of avirulence of this gene on Loros (Lr24). An additional recessive gene for virulence interacted with gene LrB in Carina and Brevit. It is not known whether the gene for virulence, which corresponds to a particular host gene for resistance, is the same in each race of leaf rust that was studied. All genes for virulence segregated independently.

Adult-plant leaf rust resistance in Thatcher and Marquis wheat: a genetic analysis of the host–parasite interaction

1969 ◽  
Vol 47 (2) ◽  
pp. 267-269 ◽  
Author(s):  
P. Bartos ◽  
P. L. Dyck ◽  
D. J. Samborski
Keyword(s):  
Leaf Rust ◽  
Adult Plant Resistance ◽  
Recessive Gene ◽  
Leaf Rust Resistance ◽  
Adult Plant ◽  
Single Recessive Gene ◽  
Wheat Varieties ◽  
Host Parasite ◽  
Host Genes ◽  
Adult Plants

Inheritance of adult-plant resistance to race 9 of leaf rust was investigated in the wheat varieties Thatcher and Marquis. Resistance was conferred by the same recessive gene in both varieties. The genetics of virulence on adult plants of Thatcher was studied in a F2 population of cultures from a cross between races 9 and 161. A single recessive gene conferred virulence on adult plants of Thatcher. This gene was inherited independently of the genes that condition virulence on host genes Lr1, Lr2, Lr3, and Lr11.

THE INHERITANCE OF RESISTANCE TO PUCCINIA RECONDITA IN HEXAPLOID TRITICALE

1972 ◽  
Vol 14 (3) ◽  
pp. 495-505 ◽  
Author(s):  
M. A. Quinones ◽  
E. N. Larter ◽  
D. J. Samborski
Keyword(s):  
Leaf Rust ◽  
Parental Species ◽  
Dominant Gene ◽  
Tetraploid Wheat ◽  
Puccinia Recondita ◽  
Inheritance Of Resistance ◽  
Wheat Leaf Rust ◽  
Hexaploid Triticale ◽  
Wheat Leaf ◽  
Or Genes

Rob. ex. Desm. f. sp. tritici, was studied in the hexaploid triticale cultivars 6A-190, Rosner, Armadillo, Bronco, and Toluca 160.Resistance in the triticales studied was monogenically inherited and each cultivar carried a single dominant gene. The genes conditioned resistance to races 15 and 30, and were designated genes A (6A-190), B (Rosner) C (Armadillo), D (Bronco), and E (Toluca 160). Gene A was linked in repulsion with gene C with a crossover value of 44.75 ± 1.44% and segregated independently from the other genes. Genes B and C were also independently inherited. Gene B was not linked with genes C, D, and E but observed distorted ratios with genes D and E suggested the presence of a modifying gene or genes. A similar distorted ratio was observed between genes C and D. Gene C assorted independently from gene E. No recombinants were recovered from the cross between Bronco × Toluca 160 suggesting that genes D and E were allelic or closely linked. The parental triticale cultivars Bronco and Toluca 160 carrying the genes D and E, respectively, appeared to carry modifying genes which inhibited the expression of resistance in certain crosses.The result obtained indicated that the genes governing resistance were derived from the tetraploid wheat parental species and that resistance to wheat leaf rust carried by the rye parent was not expressed in the triticale amphiploid. It was also found that genes conditioning resistance to wheat leaf rust were equally effective in conditioning resistance to rye leaf rust.

GENETICS OF PATHOGENICITY IN THREE RACES OF LEAF RUST ON FOUR WHEAT VARIETIES

1973 ◽  
Vol 15 (1) ◽  
pp. 73-82 ◽  
Author(s):  
M. E. A. Haggag ◽  
D. J. Samborski ◽  
P. L. Dyck
Keyword(s):  
Leaf Rust ◽  
Virulence Genes ◽  
Dominant Gene ◽  
Recessive Gene ◽  
Dominant Allele ◽  
Genetics Of Resistance ◽  
Selfed Progeny ◽  
Wheat Varieties

Populations of self-fertilized cultures of races 9, 11 and 161, "backcross" selfed progeny of race 11, F1 cultures of races 9 × 11 and 11 × 161, and F2 cultures of races 9 × 161 were used to study the genetics of virulence on the wheat varieties Democrat, Sinvalocho, Bage and Klein Aniversario and backcross lines developed from them.Race 9 was homozygous avirulent on all the host varieties tested. Selfed populations of race 11 segregated for a recessive gene, p3, for virulence on Democrat × Thatcher6 (Lr3), Sinvalocho and Sinvalocho × Thatcher2. Race 11 has an additional dominant gene for virulence on the latter two varieties. Race 11 appears to have p3 plus a second gene(s) for virulence or a modifier(s) of the dominant allele of p3 for virulence on Sinvalocho × Prelude6 (Lr3). This would correspond to a modifier or suppressor in the genetics of resistance of Sinvalocho × Prelude6. Race 11 was homozygous for avirulence on Bage, heterozygous for p3 and one other gene for virulence on Bage × Thatcher8. This race was heterozygous for two genes for virulence on Klein Aniversario and for one gene on backcross lines derived from this variety. These genes were independent of p3. The data of the "backcross" selfed progeny of race 11 agreed in general with the above. Race 161 was segregating for a dominant gene for virulence on Democrat, Democrat × Thatcher6 and Sinvalocho × Prelude6, and for a recessive gene on Bage and Klein Aniversario × Thatcher6. It was homozygous avirulent on Klein Aniversario and homozygous virulent on Bage × Thatcher8. The pathogenicity of the F1 cultures of races 11 × 161 suggested that the two races have virulence genes at the same locus. These data and those from the F2 populations of races 9 × 161 supported the results from the selfed populations.

INHERITANCE OF VIRULENCE IN PUCCINIA RECONDITA ON ALLELES AT THE Lr2 LOCUS FOR RESISTANCE IN WHEAT

1974 ◽  
Vol 16 (2) ◽  
pp. 323-332 ◽  
Author(s):  
P. L. Dyck ◽  
D. J. Samborski
Keyword(s):  
Leaf Rust ◽  
Rust Fungus ◽  
Recessive Gene ◽  
Puccinia Recondita ◽  
Single Recessive Gene ◽  
Wheat Varieties ◽  
Additional Gene

The inheritance of virulence on the Lr2 alleles for resistance to the leaf rust fungus (P. recondita Rob. ex. Desm.) was investigated using selfed and "backcross" selfed cultures of race 11, F1 cultures of race 9 × race 11, race 11 × race 161 and F1 and F2 cultures of race 9 × race 161. The three host alleles Lr2a, Lr2b and Lr2c were transferred into the wheat varieties Thatcher, Red Bobs and Prelude by a series of backcrosses. Race 11, and probably race 161, have a single recessive gene, p2, for virulence on the three Lr2 alleles and an additional gene(s) that modifies or inhibits the action of the p2 gene on the three host alleles. Lines with the Lr2a gene from Webster were most resistant to the greatest number of cultures, those with Lr2b from Carina were intermediate while those with Lr2c from Brevit and Loros were least resistant. The Lr2 alleles were most effective in the Thatcher background, intermediate in Prelude and least effective in Red Bobs.

scholarly journals Transcriptome Analysis Based on Lr19-Virulent Mutants Strain Provides Clues for the Pathogenicity-Related Genes and Effectors of Puccinia Triticina

2020 ◽  
Author(s):  
Wenyue Wu ◽  
Fan Fan ◽  
Fei Wang ◽  
Zhongchi Cui ◽  
Xinkang Sun ◽  
...  
Keyword(s):  
Leaf Rust ◽  
Rapid Evolution ◽  
Puccinia Triticina ◽  
Leaf Rust Resistance ◽  
Differentially Expressed ◽  
Leaf Rust Resistance Gene ◽  
Post Inoculation ◽  
Wheat Leaf Rust ◽  
Wheat Leaf ◽  
Race 1

Abstract Background: Wheat leaf rust caused by Puccinia triticina (Pt) remains one of the most destructive diseases of common wheat worldwide. Cultivating resistant cultivars is an effective way to control this disease, but race-specific resistance can be overcome quickly due to the rapid evolution of Pt populations. The critical to control wheat leaf rust is to understand the pathogenicity mechanisms of Pt. Results: In this study, the spores of the Pt race PHNT (wheat leaf rust resistance gene Lr19-avirulent isolate) were mutagenized with ethyl methanesulfonate (EMS) and two Pt Lr19-virulent mutants named M1 and M2 were isolated, suggesting that they carry mutations affecting the Lr19-specific avirulent factor. RNA sequencing was performed on samples collected from the wheat cultivars Chinese Spring and TcLr19 that were infected by wild-type (WT) PHNT and the two Lr19-virulent mutant isolates at 14 days post-inoculation (dpi). The assembled transcriptome data were compared to the reference genome “Pt 1-1 BBBD Race 1.” A total of 216 differentially expressed genes (DEGs) were found from three different sample comparisons including M1-vs-WT, M2-vs-WT, and M1-vs-M2. Of these DEGs, 29 common DEGs were shared between M1-vs-WT and M2-vs-WT comparisons. Among the 216 DEGs encoding proteins, 30 were predicted to be effector candidates. Then 6 effector candidates (PTTG_27844, PTTG_05290, PTTG_27401, PTTG_27224, PTTG_26282, PTTG_25521) were verified that these genes were differentially expressed during Pt infection by quantitative real-time PCR (qRT-PCR) and were validated on tobacco, and the results showed that PTTG_27401 could inhibit progress of cell death (PCD) induced by BAX.Conclusions: Our results showed that a large number of genes participate in the interaction between Pt and TcLr19, which will provide valuable resources for the identification and targeting of AvrLr19 effector candidates and pathogenesis-related genes. Furthermore, our analyses are of great significance to reveal the pathogenesis of Pt.

scholarly journals Aggressiveness Components and Adaptation to a Host Cultivar in Wheat Leaf Rust

2009 ◽  
Vol 99 (7) ◽  
pp. 869-878 ◽  
Author(s):  
Bénédicte Pariaud ◽  
Corinne Robert ◽  
Henriette Goyeau ◽  
Christian Lannou
Keyword(s):  
Leaf Rust ◽  
High Frequency ◽  
Spore Production ◽  
The Other ◽  
Wheat Leaf Rust ◽  
Clonal Structure ◽  
Life Traits ◽  
Wheat Leaf ◽  
Pathogen Populations ◽  
Host Tissues

Experimental evidence on the capacity of pathogen populations to quantitatively adapt to their hosts and on the life traits that are involved is lacking at this time. In this article, we identified a situation in which a leaf rust pathotype (P1) was found at a high frequency on a widely grown cultivar (Soissons) and we tested the hypothesis that P1 was more aggressive on Soissons than other virulent pathotypes (P2 and P3). Several components of the pathogen life cycle were measured on adult wheat plants in two different experiments under greenhouse conditions: latent period, spore production per lesion and per unit of sporulating tissue, uredinium size, and lesion life span. Regardless of the component, pathotype P1 was repeatedly found to be more aggressive than at least one of the other two pathotypes, with differences of 5 to 51%. Breaking down spore production per lesion into uredinium size and spore production per square millimeter of sporulating tissue showed that the three pathotypes presented different aggressiveness profiles, suggesting different development constraints for the pathogen, either for its growth capacity into host tissues or its ability to exploit the host resources for spore production. Although leaf rust pathotypes present a clonal structure, quantitative differences were found for aggressiveness traits within a pathotype.

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 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.

GENETICS OF RESISTANCE TO LEAF RUST IN TWO ACCESSIONS OF COMMON WHEAT

1989 ◽  
Vol 69 (2) ◽  
pp. 531-534 ◽  
Author(s):  
P. L. DYCK ◽  
P. E. JEDEL
Keyword(s):  
Triticum Aestivum ◽  
Leaf Rust ◽  
Rust Resistance ◽  
Infection Type ◽  
Dominant Gene ◽  
Leaf Rust Resistance ◽  
Puccinia Recondita ◽  
Wheat Leaf Rust ◽  
Genetics Of Resistance ◽  
Wheat Leaf

Two accessions, V336 and V618, of the A. E. Watkins wheat (Triticum aestivum) collection were studied genetically for their resistance to leaf rust (Puccinia recondita). The two accessions have in common a dominant gene that gives a fleck infection type reaction to all the isolates of leaf rust used. This gene may be a previously unidentified gene and we have tentatively assigned the gene symbol LrW. Both accessions also have gene Lr33 and V336 has LrB.Key words: Triticum aestivum, wheat, leaf rust resistance

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