scholarly journals Detection of Virulence to Lr41 in a South African Pathotype of Puccinia recondita f. sp. tritici

Plant Disease ◽  
1997 ◽  
Vol 81 (4) ◽  
pp. 423-423 ◽  
Author(s):  
Z. A. Pretorius
Keyword(s):  
Leaf Rust ◽  
South African ◽  
Leaf Rust Resistance ◽  
Single Step ◽  
Puccinia Recondita ◽  
Recurrent Parent ◽  
Tauschii Accession ◽  
Seedling Resistance ◽  
Kansas State University ◽  
Infection Types

The Lr41 gene for resistance to leaf rust, caused by Puccinia recondita f. sp. tritici, was transferred from Triticum tauschii accession TA2460 to bread wheat (T. aestivum) at the Wheat Genetics Resource Center, Kansas State University (1). Due to the high degree of resistance (primary leaf infection types [ITs] 0; to ;1= [0 to 4 scale]) conferred to South African pathotypes of leaf rust, the gene was considered potentially valuable in local programs directed at wheat germ plasm improvement. During routine glasshouse tests for seedling resistance to the South African leaf rust pathotype UVPrt16, several sporulating pustules (IT 4) were observed among flecks on wheat line KS90WGRC10 (TAM107*3/TA2460). Rust cultures multiplied from these pustules were tested on seedlings of 31 wheat lines with different Lr genes in a growth cabinet at 20°C. Their avirulence/virulence characteristics suggested a single-step mutation for virulence to Lr41. According to North American nomenclature (2), the Lr41-virulent isolate is classified as race FDC-14b,20,23,25,33,41. Low ITs were recorded on additional testers with Lr3bg, 14a, 15, 18, 19, 27+31, 28, and 29, and intermediate ITs on lines with Lr2b, 10, 21, 32, and 36. Infection studies on adult plants showed that KS90WGRC10 and its recurrent parent TAM107 produced similar susceptible reactions (Its 3++C) to the mutant. T. tauschii accession TA2460, however, was moderately susceptible (IT 2+) to this culture. Virulence to Lr41 has not been recorded in field populations of the pathogen in South Africa. The occurrence of virulence to Lr41 emphasized the nondurability of monogenic resistance and thus the importance of conserving genetic diversity for leaf rust resistance. To protect Lr41 from becoming obsolete, it should be used only in combination with other effective resistance gene(s). References: (1) T. S. Cox et al. Crop Sci. 32:506, 1992. (2) D. L. Long and J. A. Kol-mer. Phytopathology 79:525, 1989.

INHERITANCE OF LEAF RUST RESISTANCE IN WHEAT CULTIVARS RAFAELA AND EAP 26127 AND CHROMOSOME LOCATION.OF GENE Lr17

1977 ◽  
Vol 19 (2) ◽  
pp. 355-358 ◽  
Author(s):  
P. L. Dyck ◽  
E. R. Kerber
Keyword(s):  
Triticum Aestivum ◽  
Leaf Rust ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Triticum Aestivum L ◽  
Puccinia Recondita ◽  
Wheat Cultivars ◽  
Seedling Resistance

The inheritance of seedling resistance to leaf rust (Puccinia recondita) was studied in wheat (Triticum aestivum L.) cultivars Rafaela and EAP 26127. Rafaela has genes Lr14b and Lr17 while EAP 26127 has Lr17. Lr17 was located on chromosome 2A, possibly the short arm, and was independent of Lr11.

AGRONOMIC AND QUALITY CHARACTERISTICS OF WHEAT LINES WITH LEAF RUST RESISTANCE DERIVED FROM TRITICUM SPELTOIDES

1981 ◽  
Vol 23 (3) ◽  
pp. 475-480 ◽  
Author(s):  
D. R. Knott ◽  
J. Dvořák
Keyword(s):  
Leaf Rust ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Triticum Aestivum L ◽  
Quality Characteristics ◽  
Puccinia Recondita ◽  
Recurrent Parent ◽  
Wheat Lines ◽  
Speltoides Chromosome ◽  
Deleterious Genes

Eleven lines of wheat (Triticum aestivum L.) carrying resistance to leaf rust (Puccinia recondita Rob. ex. Desm.) derived from five accessions of Triticum speltoides Tausch were grown in yield tests in 1977 and 1979. The grain was tested for quality characteristics in both years. Although the lines had been backcrossed four or five times to either Manitou or Neepawa, only four of the eleven showed any real promise of equalling their recurrent parent in agronomic and quality characteristics. Lines derived from the same accession of T. speltoides were surprisingly variable. The generally deleterious effects of the transferred chromatin are due either to genes linked to the genes for leaf rust resistance plus incomplete compensation by the speltoides chromosome segment for the aestivum segment it replaced, or to the effects of additional translocations that were not eliminated during backcrossing. A second cycle of homoeologous recombination is proposed as a way to eliminate some of the deleterious genes.

scholarly journals Virulence in Puccinia recondita f. sp. tritici Isolates from Canada to Genes for Adult-Plant Resistance to Wheat Leaf Rust

Plant Disease ◽  
1997 ◽  
Vol 81 (3) ◽  
pp. 267-271 ◽  
Author(s):  
J. A. Kolmer
Keyword(s):  
Leaf Rust ◽  
Resistance Genes ◽  
Infection Type ◽  
Leaf Rust Resistance ◽  
Seedling Resistance ◽  
High Infection ◽  
Rust Severity ◽  
Lower Infection ◽  
Infection Types ◽  
Adult Plants

Sixty-seven isolates of Puccinia recondita f. sp. tritici collected in Canada were tested for virulence to adult plants of Thatcher near-isogenic wheat lines with leaf rust resistance genes Lr13, Lr22a, Lr34, Lr35, and Lr13 and Lr34 combined. All of the isolates had low infection type to the Thatcher lines with Lr22a and Lr35. All isolates had lower infection type and lower rust severity on the Thatcher line with Lr34 compared with Thatcher. The isolates were polymorphic for virulence to the Thatcher line with Lr13; many isolates were completely virulent to this line, and other isolates produced very low or intermediate avirulent infection type. On the Thatcher line with Lr13 and Lr34 combined, many isolates had infection type and rust severity similar to the Thatcher line with Lr34, while other isolates had lower infection type and rust severity compared with the single-gene lines with Lr13 or Lr34. Fifteen isolates with low, intermediate, and high infection type to adult plants with Lr13 were tested for infection type on seedling plants of the Thatcher lines with resistance genes Lr13, Lr22a, Lr34, Lr35, and Lr37, and on Thatcher lines with Lr13 paired with seedling resistance genes. Most isolates were completely virulent to seedling plants with Lr13 and Lr22a. Plants with Lr37 expressed seedling resistance to all isolates tested. Seedling plants with Lr34 had lower infection types to all isolates compared with Thatcher. Seedlings with Lr35 had high infection types to most isolates, with varying amounts of chlorosis. The Thatcher lines with Lr13 plus seedling resistance genes were most resistant to the isolates that had very low infection types on adult plants with Lr13 and intermediate infection types on plants with seedling resistance genes. Genes Lr22a, Lr35, and Lr37 offer additional sources of highly effective leaf rust resistance in wheat.

THE INHERITANCE OF RESISTANCE TO PUCCINIA RECONDITA IN A GROUP OF COMMON WHEAT CULTIVARS

1982 ◽  
Vol 24 (3) ◽  
pp. 273-283 ◽  
Author(s):  
P. L. Dyck ◽  
D. J. Samborski
Keyword(s):  
Leaf Rust ◽  
Common Wheat ◽  
Infection Type ◽  
Leaf Rust Resistance ◽  
Triticum Aestivum L ◽  
Puccinia Recondita ◽  
Adult Plant ◽  
Leaf Rust Resistance Gene ◽  
Seedling Resistance ◽  
Plant Stage

The inheritance of seedling resistance to leaf rust (Puccinia recondita Rob. ex Desm.) was studied in common wheat (Triticum aestivum L.) cultivars: Terenzio, Lageadinho, PI 321999, PI 197249, CRIC 26809-68, CIRC 32125-70, 72 Hills 175 and Frontana. They have in common two complementary genes (LrT2 and LrT3) that give a variable type of leaf rust resistance. Gene LrT2 is the most effective gene. In the Thatcher background, resistance to stem rust in the adult plant stage appears to be associated with this gene. The previously reported gene from PI 58548 that gives a 2+ infection type appears to be the same as LrT2. Terenzio also carries Lr3 and Lr30 while PI 197249 has Lr3.

scholarly journals Genetics of Leaf Rust Resistance in Canadian Spring Wheats AC Domain and AC Taber

Plant Disease ◽  
1997 ◽  
Vol 81 (7) ◽  
pp. 757-760 ◽  
Author(s):  
J. Q. Liu ◽  
J. A. Kolmer
Keyword(s):  
Leaf Rust ◽  
Spring Wheat ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Effective Field ◽  
Adult Plant ◽  
Seedling Resistance ◽  
Hard Red Spring Wheat ◽  
Plant Gene ◽  
Infection Types

The hard red spring wheat cultivar AC Domain and the Canada Prairie Spring wheat AC Taber have recently been licensed and released in western Canada and are resistant to leaf rust caused by Puccinia recondita f. sp. tritici. To determine the genetic basis of this resistance, the two cultivars were crossed with the leaf rust susceptible wheat Thatcher (Tc), and F1 plants were backcrossed to Thatcher. F2 families from Tc*2/AC Domain and AC Taber/Tc*2 were tested with isolates of P. recondita f. sp. tritici as seedlings in the greenhouse and as adults in the field rust nursery. Segregation of BC1F2 families indicated that AC Domain had seedling resistance genes Lr10 and Lr16, and the adult plant gene Lr34. AC Domain was also hypothesized to have the adult plant gene Lr12 based on infection types with P. recondita f. sp. tritici isolates that differed for virulence to Lr12. The effective field leaf rust resistance of AC Domain was conditioned by Lr16 and Lr34. Segregation of BC1F2 families and infection types of BC1F3-derived BC1F4 plants indicated that AC Taber had Lr14a for seedling resistance, the adult plant gene Lr13, plus an additional uncharacterized adult plant resistance gene currently designated as LrTb.

THE INHERITANCE OF RESISTANCE IN RYE TO Puccinia recondita f. sp. secalis and f. sp. tritici

1984 ◽  
Vol 64 (3) ◽  
pp. 511-519 ◽  
Author(s):  
G. L. C. MUSA ◽  
P. L. DYCK ◽  
D. J. SAMBORSKI
Keyword(s):  
Disease Resistance ◽  
Leaf Rust ◽  
Secale Cereale ◽  
Single Gene ◽  
Inbred Lines ◽  
Puccinia Recondita ◽  
Wheat Leaf Rust ◽  
Susceptible Parent ◽  
Seedling Resistance ◽  
Wheat Leaf

The inheritance of seedling resistance to isolate RLR 213/78 of rye leaf rust (Puccinia recondita f. sp. secalis) and race 30 of wheat leaf rust (P. recondita f. sp. tritici Rob.) was investigated in six inbred lines of rye (Secale cereale). Inbred line UM8116 was used as the susceptible parent in crosses. Inbred lines UM8003, UM8071 and UM8301 each have a single gene and UM8336 and UM8340 each have two genes for resistance to rye leaf rust. For resistance to wheat leaf rust UM8071 has a single gene, UM8003 and UM8340 each have two genes and UM8301 and UM8336 each have three genes. UM8295 is heterogeneous for reaction to both rusts. One of the genes in UM8340 may condition resistance to both rusts. The genes for resistance to RLR 213/78 appear to be independently inherited while some of the genes conferring resistance to race 30 may be identical or very closely linked. The potential of rye as a source of disease resistance for wheat and triticale improvement is discussed.Key words: Secale cereale, disease resistance, wheat leaf rust

scholarly journals Genetic studies in wheat for leaf rust resistance (Puccinia recondita)

2011 ◽  
Vol 10 (16) ◽  
pp. 3051-3054 ◽  
Author(s):  
Hussain Fida ◽  
Ashraf M ◽  
A Hameed Muhammad ◽  
Hussain Nisar ◽  
Ahmad Sial Riaz
Keyword(s):  
Leaf Rust ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Puccinia Recondita ◽  
Genetic Studies

scholarly journals Genetic Analysis of Leaf Rust Resistance in Six Durum Wheat Genotypes

2014 ◽  
Vol 104 (12) ◽  
pp. 1322-1328 ◽  
Author(s):  
Alexander Loladze ◽  
Dhouha Kthiri ◽  
Curtis Pozniak ◽  
Karim Ammar
Keyword(s):  
Durum Wheat ◽  
Leaf Rust ◽  
Resistance Genes ◽  
Rust Resistance ◽  
Durable Resistance ◽  
Puccinia Triticina ◽  
Leaf Rust Resistance ◽  
Adult Plant ◽  
Seedling Resistance ◽  
Allelism Tests

Leaf rust, caused by Puccinia triticina, is one of the main fungal diseases limiting durum wheat production. This study aimed to characterize previously undescribed genes for leaf rust resistance in durum wheat. Six different resistant durum genotypes were crossed to two susceptible International Maize and Wheat Improvement Center (CIMMYT) lines and the resulting F1, F2, and F3 progenies were evaluated for leaf rust reactions in the field and under greenhouse conditions. In addition, allelism tests were conducted. The results of the study indicated that most genotypes carried single effective dominant or recessive seedling resistance genes; the only exception to this was genotype Gaza, which carried one adult plant and one seedling resistance gene. In addition, it was concluded that the resistance genes identified in the current study were neither allelic to LrCamayo or Lr61, nor were they related to Lr3 or Lr14a, the genes that already are either ineffective or are considered to be vulnerable for breeding purposes. A complicated allelic or linkage relationship between the identified genes is discussed. The results of the study will be useful for breeding for durable resistance by creating polygenic complexes.

The association of a gene for leaf rust resistance with the chromosome 7D suppressor of stem rust resistance in common wheat

Genome ◽  
1987 ◽  
Vol 29 (3) ◽  
pp. 467-469 ◽  
Author(s):  
P. L. Dyck
Keyword(s):  
Leaf Rust ◽  
Common Wheat ◽  
Stem Rust ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Triticum Aestivum L ◽  
Suppressor Gene ◽  
Stem Rust Resistance ◽  
Recurrent Parent ◽  
Cytogenetic Evidence

Backcross lines of gene LrT2 for resistance to leaf rust in the common wheat (Triticum aestivum L.) 'Thatcher' unexpectedly show improved resistance to stem rust compared with that of the recurrent parent. Genetic–cytogenetic evidence indicates that LrT2 is on chromosome 7D, which is known to carry the "suppressor" gene(s) that prevent the expression of stem rust resistance conferred by other genes in 'Canthatch'. Thus, LrT2 may be a nonsuppressing allele of the suppressor gene(s) or be closely linked to such an allele. LrT2 has been designated Lr34. Key words: Triticum, wheat, rust resistance.

THE INHERITANCE OF LEAF RUST RESISTANCE IN SEVEN VARIETIES OF COMMON WHEAT

1961 ◽  
Vol 41 (2) ◽  
pp. 342-359 ◽  
Author(s):  
R. G. Anderson
Keyword(s):  
Leaf Rust ◽  
Common Wheat ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Susceptible Variety ◽  
The Other ◽  
Seedling Resistance ◽  
Genetic Studies ◽  
Type Reaction ◽  
Biological Studies

The inheritance of seedling resistance to races 1a, 5a, 11, 15a and 126a of leaf rust was studied in the varieties Exchange and Selkirk and to races 1a and 15a in the varieties Lee, Gabo, Timstein, Mayo 52 and Mayo 54. Thatcher was used as the susceptible variety. Rust tests were carried out on F1 and F2 populations of diallel crosses among these varieties and on F2 families from the backcrosses to Thatcher. Two genes were found. One gene LrE conditions a (2) type reaction to all five races in Exchange and Selkirk. The other gene LrL conditions a (; 1 =) type reaction to races 1a and 15a in all seven varieties. Isogenic lines possessing these genes are being developed in the varieties Prelude and Thatcher. The importance of such lines in future genetic studies and their application in other biological studies are discussed.The increase in amount of leaf rust found on Lee and Selkirk in Canada during the period 1951–1958 is accounted for by the increase of races which render the gene LrL ineffective in these two varieties.

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