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.

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.

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.

Molecular and virulence diversity and linkage disequilibria in asexual and sexual populations of the wheat leaf rust fungus, Puccinia recondita

Genome ◽  
1998 ◽  
Vol 41 (6) ◽  
pp. 832-840 ◽  
Author(s):  
J Q Liu ◽  
J A Kolmer
Keyword(s):  
Leaf Rust ◽  
Rust Fungus ◽  
Field Population ◽  
Puccinia Recondita ◽  
Wheat Leaf Rust ◽  
Asexual Population ◽  
Sexual Population ◽  
Linkage Disequilibria ◽  
Wheat Leaf ◽  
Virulence Diversity

An asexual field population and a sexually derived population of the wheat leaf rust fungus, Puccinia recondita, were examined and compared for diversity and linkage disequilibria between virulence and molecular phenotypes. Isolates in both populations were tested for virulence to 20 Thatcher wheat lines near-isogenic for leaf rust resistance genes, and for random amplified polymorphic DNA (RAPD) variation using 10 DNA primers. In the asexual field population, 36 virulence phenotypes and 14 RAPD phenotypes were identified in 43 isolates. In the sexual population, 87 virulence phenotypes and 79 RAPD phenotypes were identified in 104 isolates. Linkage disequilibria was less in the sexual population compared to the asexual field population. Virulence-RAPD phenotype pairs (110 in total) were directly compared between the two populations for association. In the asexual population, 39 virulence-RAPD phenotype pairs were associated (P < 0.05), compared with 18 pairs in the sexual population. Linkage was not evident, as some residual disequilibria remained between virulence and RAPD phenotypes. In the asexual population 18 RAPD phenotype pairs were associated, compared with 9 pairs in the sexual population. The sexual population was also tested for RAPD variation with an additional six primers. In the sexual population, amplification sites of four different primers were tightly linked which indicated a chromosomal segment in P. recondita may not readily undergo recombination. Disequilibria between virulence and RAPD phenotypes in field populations of P. recondita in Canada is maintained by asexual reproduction.Key words: Puccinia recondita, molecular diversity, virulence diversity, linkage disequilibria, wheat leaf rust.

scholarly journals Número de genes involucrados en el desarrollo lento de la Roya de la Hoja (Puccinia recondita f. sp. Tritici) en trigo

1999 ◽  
Vol 3 (1) ◽  
pp. 25
Author(s):  
Luis Fernando Campuzano Duque
Keyword(s):  
Leaf Rust ◽  
Block Design ◽  
Genetic Resistance ◽  
Leaf Rust Resistance ◽  
Puccinia Recondita ◽  
Wheat Varieties ◽  
Slow Rusting ◽  
Progress Curve ◽  
Randomized Block Design ◽  
Number Of Genes

<p>Con el fin de determinar el número de genes involucrados en el tipo de resistencia de desarrollo lento de la roya de la hoja en las variedades de trigo Pavón 76,Hermosillo 77 y Nacozari 76, se realizó un estudio en el Centro Internacional de Mejoramiento de Maíz y Trigo (CIMMYT) localizado en Texcoco, Estado de Méjico. Para el efecto, se obtuvieron las cruzas simples posibles de estas tres variedades con una variedad susceptible carente de genes de resistencia, denominada Jupateco 73<sup>S</sup>. Los progenitores y 74 familias F<sub>5</sub>, de cada una de las seis cruzadas, fueron sembradas en un diseño de bloques completos aI azar con un arreglo de parcelas divididas con tres repeticiones. La respuesta a la enfermedad en las familias F<sub>5</sub>, se evaluó calculando el Área Bajo la Curva de Progreso de la Roya de la Hoja (ABCPRH). El estudio genético se realizó mediante el análisis dialélico de Griffing, (1986) (Modelo 2, Método 4), a partir del cual se estimaron las varianzas requeridas para calcular el número de genes involucrados en cada cruza mediante la fórmula de Wright, (1968). La resistencia genética a la roya de la hoja fue controlada por dos genes en las variedades Pavón 76 y Hermosillo 77 y por tres genes en Nacozari 76, sobre la base de que Jupateco 73<sup>S</sup> no posee genes efectivos de resistencia.</p><p> </p><p><strong>Number of genes involved in slow-rusting to leaf rust (Puccinia recondita f. sp. tritici) in wheat.</strong></p><p> In order to determine the number of genes involved in the type of leaf rust resistance called "slow rusting" in Pavón76, Hermosillo 77 and Nacozari 76 wheat varieties a study was carried out at the International Maize and Wheat Improvement Center (CIMMYT) located in Texcoco, State of Mexico. All possible single crosses were entered into these three varieties with a susceptible lacking variety genes resistance called Jupateco 73<sup>S</sup>.Parents and 74 F<sub>5</sub> families of each cross were planted in a split plot randomized block design with three replications. The disease was evaluated using the Area Under the Leaf Rust Progress Curve (AULRPC). The genetic studies were achieved according to the model 2 Method 4 of Griffing,(1956) aiming the required variances to calculate the number of genes involved in each cross, according to Wright's (1968) formula. The leaf rust genetic resistance was controlled by two genes in Pavón76 and Hermosillo 77 varieties and by three genes in Nacozari 76, based on Jupateco 73<sup>S</sup> does not possess effective genes of resistance.</p>

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.

THE INHERITANCE OF RESISTANCE TO STEM RUST RACES 56 AND 15B-1L (CAN.) IN THE WHEAT VARIETIES HOPE AND H-44

1968 ◽  
Vol 10 (2) ◽  
pp. 311-320 ◽  
Author(s):  
D. R. Knott
Keyword(s):  
Adult Plant Resistance ◽  
Recessive Gene ◽  
Adult Plant ◽  
Inheritance Of Resistance ◽  
Single Recessive Gene ◽  
Wheat Varieties ◽  
Adult Plant Stage ◽  
Plant Stage ◽  
Physiological Resistance ◽  
Dominant Genes

The inheritance of resistance to races 56 and 15B-1L was studied in back-crosses of Hope and H-44 to Marquis. The results indicated that both varieties carry the same three genes. Resistance to race 56 is controlled by two dominant genes, Sr 1 which conditions seedling or physiological resistance and Sr 2 which conditions adult plant resistance. At either the seedling or adult plant stage both genes must be present to provide full resistance to race 56. A single recessive gene, not yet named, provides resistance to race 15B-1L.The gene Sr 1 was transferred from Hope to Marquis by backcrossing and the line was crossed to the Chinese Spring monosomics. The gene proved to be on chromosome 2B (XIII).

ADULT-PLANT LEAF RUST RESISTANCE IN PI 250413, AN INTRODUCTION OF COMMON WHEAT

1979 ◽  
Vol 59 (2) ◽  
pp. 329-332 ◽  
Author(s):  
P. L. DYCK ◽  
D. J. SAMBORSKI
Keyword(s):  
Leaf Rust ◽  
Common Wheat ◽  
Rust Resistance ◽  
Adult Plant Resistance ◽  
Recessive Gene ◽  
Leaf Rust Resistance ◽  
Triticum Aestivum L ◽  
Adult Plant ◽  
Single Recessive Gene ◽  
Plant Leaf

The genetics of adult-plant resistance to leaf rust (Puccinia recondita Rob. ex. Desm.) was studied in a common wheat (Triticum aestivum L.) introduction PI 250413, originally collected in Pakistan. The resistance, although variable in expression, was conditioned bx a single recessive gene not previously identified, which was inherited independently of Lr12, Lr13 and Lr22, three previously identified genes for adult-plant leaf rust resistance. The gene present in PI 250413 was also found in five introductions from Iraq.

scholarly journals Genetically Divergent Types of the Wheat Leaf Fungus Puccinia triticina in Ethiopia, a Center of Tetraploid Wheat Diversity

2016 ◽  
Vol 106 (4) ◽  
pp. 380-385 ◽  
Author(s):  
J. A. Kolmer ◽  
M. A. Acevedo
Keyword(s):  
Leaf Rust ◽  
Common Wheat ◽  
Hexaploid Wheat ◽  
Rust Fungus ◽  
Tetraploid Wheat ◽  
Low Frequency ◽  
Puccinia Triticina ◽  
Leaf Rust Resistance ◽  
Virulence Phenotype ◽  
Wheat Leaf

Collections of Puccinia triticina, the wheat leaf rust fungus, were obtained from tetraploid and hexaploid wheat in the central highlands of Ethiopia, and a smaller number from Kenya, from 2011 to 2013, in order to determine the genetic diversity of this wheat pathogen in a center of host diversity. Single-uredinial isolates were derived and tested for virulence phenotype to 20 lines of Thatcher wheat that differ for single leaf rust resistance genes and for molecular genotypes with 10 simple sequence repeat (SSR) primers. Nine virulence phenotypes were described among the 193 isolates tested for virulence. Phenotype BBBQJ, found only in Ethiopia, was predominantly collected from tetraploid wheat. Phenotype EEEEE, also found only in Ethiopia, was exclusively collected from tetraploid wheat and was avirulent to the susceptible hexaploid wheat ‘Thatcher’. Phenotypes MBDSS and MCDSS, found in both Ethiopia and Kenya, were predominantly collected from common wheat. Phenotypes CCMSS, CCPSS, and CBMSS were found in Ethiopia from common wheat at low frequency. Phenotypes TCBSS and TCBSQ were found on durum wheat and common wheat in Kenya. Four groups of distinct SSR genotypes were described among the 48 isolates genotyped. Isolates with phenotypes BBBQJ and EEEEE were in two distinct SSR groups, and isolates with phenotypes MBDSS and MCDSS were in a third group. Isolates with CCMSS, CCPSS, CBMSS, TCBSS, and TCBSQ phenotypes were in a fourth SSR genotype group. The diverse host environment of Ethiopia has selected and maintained a genetically divergent population of P. triticina.

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