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.

THE INHERITANCE OF LEAF RUST RESISTANCE IN FOUR COMMON WHEAT VARIETIES POSSESSING GENES AT OR NEAR THE Lr3 LOCUS

1973 ◽  
Vol 15 (1) ◽  
pp. 127-134 ◽  
Author(s):  
M. E. A. Haggag ◽  
P. L. Dyck
Keyword(s):  
Genetic Analysis ◽  
Leaf Rust ◽  
Common Wheat ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Suppressor Gene ◽  
The Other ◽  
Wheat Varieties ◽  
Seedling Resistance

The inheritance of seedling resistance to leaf rust was studied in the wheat varieties Democrat, Sinvalocho, Bage and Klein Aniversario and in the backcross lines developed from them. The Lr3 gene from Democrat and Sinvalocho conferred resistance to races 1, 9 and 11. Genetic analysis of the Sinvalocho × Prelude0 line (with Lr3), using a rust culture that was avirulent on Democrat × Thatcher6 and Sinvalocho etc., but virulent on Sinvalocho × Prelude6, indicated the presence of a suppressor gene in Prelude. The variety Bage has two genes for resistance to races 9 and 11, one giving a 0; reaction and the other a type 2. The former gene was present in Bage × Thatcher8 and was allelic to, or closely linked with, the Lr3 gene. It is temporarily designated Lr3bg. Klein Aniversario may have two independently inherited genes conferring resistance to race 11 and two to race 161. One of the genes conferred resistance to both races and was transferred to Thatcher and Prelude. This gene was also allelic to, or closely linked with, the Lr3 gene and is designated Lr3ka. These results suggest a complex Lr3 locus with a series of alleles or closely linked genes.

CHROMOSOME LOCATION OF THREE GENES FOR LEAF RUST RESISTANCE IN COMMON WHEAT

1971 ◽  
Vol 13 (3) ◽  
pp. 480-483 ◽  
Author(s):  
P. L. Dyck ◽  
E. R. Kerber
Keyword(s):  
Leaf Rust ◽  
Common Wheat ◽  
Plant Resistance ◽  
Rust Resistance ◽  
Adult Plant Resistance ◽  
Leaf Rust Resistance ◽  
Adult Plant ◽  
Monosomic Analysis ◽  
Chromosome Location ◽  
Seedling Resistance

Genes Lr10 and Lr16 for seedling resistance and gene Lr12 for adult-plant resistance to leaf rust in common wheat were located on specific chromosomes by monosomic analysis using the Rescue monosomic series. Gene Lr10 is on chromosome 1A and genes Lr12 and Lr16 are on chromosome 4A. The latter two genes must be more than 50 crossover units apart since they segregated independently. These three genes were backcrossed into Thatcher from the variety Exchange. The variety Chinese Spring probably carries gene Lr12.

GENETICS OF RESISTANCE TO LEAF RUST IN THE COMMON WHEAT VARIETIES WEBSTER, LOROS, BREVIT, CARINA, MALAKOF AND CENTENARIO

1968 ◽  
Vol 10 (1) ◽  
pp. 7-17 ◽  
Author(s):  
P. L. Dyck ◽  
D. J. Samborski
Keyword(s):  
Leaf Rust ◽  
Common Wheat ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Genetics Of Resistance ◽  
Wheat Varieties ◽  
Seedling Resistance ◽  
The Common

Inheritance of seedling resistance to races 15 and 161 of leaf rust was investigated in the varieties Webster, Loros, Brevit, Carina, Malakof and Centenario. Backcross lines were developed in Thatcher and/or Prelude with leaf rust resistance derived from all the varieties except Brevit. The varieties and backcross lines were tested with nine races of rust. Webster was found to have the Lr2 gene which accounts for all of its resistance to the races used. Carina has an allele, Lr22, at the Lr2 locus, plus a gene tentatively assigned the symbol LrB, independent of the Lr2 locus which confers a type 2 reaction to races 15, 161 and probably several others. Resistance present in Loros is accounted for another allele, Lr24, at the Lr2 locus. Brevit also has an allele at the Lr2 locus which may be the same as that in Loros. In addition it probably has gene LrB conferring a type 2 reaction. Gene Lr1, which was independent of the Lr2 locus, accounts for all the detected resistance in Malakof. Centenario has the Lr1 gene and in addition has resistance to races 5 and 126a.The susceptible parents Thatcher and Prelude influence the dominance of the Lr2 alleles. The Lr22 allele in Carina x Prelude6 was partially dominant in crosses with Thatcher and completely dominant in crosses with Red Bobs. The Lr24 allele in Loros x Prelude6 was recessive in crosses with Thatcher and completely dominant in crosses with Prelude and Red Bobs.The expression of resistance of the Lr2 alleles to race 161 in Webster and Carina was different in crosses with Red Bobs than in those with Thatcher. In the crosses with Red Bobs one or more genes, which modified the degree of resistance to race 161, appeared to be segregating. This was not observed in crosses with Thatcher.

scholarly journals Genetic analysis of leaf rust resistance in three common wheat cultivars MP 3288, HI 784 and HI 1418 under field conditions

2019 ◽  
Vol 79 (01) ◽  
Author(s):  
T. L. Prakasha ◽  
S. Chand ◽  
A. N. Mishra ◽  
K. S. Solanki ◽  
J. B. Singh ◽  
...  
Keyword(s):  
Molecular Markers ◽  
Leaf Rust ◽  
Resistance Gene ◽  
Bread Wheat ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
The Other ◽  
Adult Plant ◽  
Wheat Cultivars ◽  
Seedling Resistance

This study aimed to investigate the genetic basis of leafrust resistance in three bread wheat cultivars viz., MP 3288, HI 1418 and HI 784 which have been maintaining high levels of resistance to leaf rust since their release in 2011, 2000, and 1983, respectively. These cultivars also possess leaf tip necrosis phenotype. These were crossed with a susceptible bread wheat cultivar Lal Bahadur and also among themselves in non-reciprocal manner.The F1 , F2 and F3 populations were raised and the inheritance of leaf rust resistance was studied using prevalent and highly virulent Puccinia triticina pathotype 77-5 (121R63-1) during 2014- 17. These studies showed that the field (adult-plant) resistance of these cultivars is governed by two dominant genes each. Closely linked molecular markers L34DINT9F and L34PLUSR revealed the presence of non-race specific adult-plant leaf rust resistance gene Lr34 in all cultivars of present study. Absence of the other documented race nonspecific APR genes viz., Lr46, Lr67 and Lr68 was indicated in all the three test cultivars based on genotyping with closely linked molecular markers WMC44, CFD71 and csgs, respectively. The other dominant gene appears to be an allstage resistance gene since all the three cultivars displayed high levels of seedling resistance to the test pathotype. Stable resistance of these cultivars could be due to synergistic/additive or complementary effects resulting from the combination of Lr34 and the all-stage resistance gene.

Leaf rust resistance of some European varieties of wheat

1969 ◽  
Vol 47 (4) ◽  
pp. 543-546 ◽  
Author(s):  
P. Bartoš ◽  
D. J. Samborski ◽  
P. L. Dyck
Keyword(s):  
Leaf Rust ◽  
Rust Resistance ◽  
Single Gene ◽  
Leaf Rust Resistance ◽  
The Other ◽  
Wheat Varieties ◽  
Genetic Studies ◽  
The World

Twenty-one European wheat varieties from the World Wheat Assortment in Prague-Ruzynĕ (Czechoslovakia) that were resistant to leaf rust were tested with Canadian leaf rust races 1, 5, 9, 11, 15, 30, 58, and 126. The patterns of rust reaction and genetic studies on representative varieties suggest that the varieties Belocerkovskaja 198, Bezostaja 1, Mironovskaja 264, Mironovskaja 808, Osetinskaja 3, Rannaja 12, Skorospelka 3b, Fertödi 293, and Sládkovičovo K 1004 have gene Lr3, the variety Halle 9H39 has gene Lr1, the varieties Erythrospermum 142, 953, and 974 I.Z.R. have genes Lr1 and Lr3, and the variety Etoile de Choisy gene Lr16. The other varieties tested (Flevina, Sambo, Stabil, Uhčetice 22/IV, and 22/V) have reactions that are different from any of those of the single gene lines tested. The varieties Weique and Salzmünder Bartweizen were resistant to all races tested.

scholarly journals Identification of leaf rust resistance genes Lr34 and Lr46 in common wheat (Triticum aestivum L. ssp. aestivum) lines of different origin using multiplex PCR

2021 ◽  
Vol 16 (1) ◽  
pp. 172-183
Author(s):  
Agnieszka Tomkowiak ◽  
Roksana Skowrońska ◽  
Michał Kwiatek ◽  
Julia Spychała ◽  
Dorota Weigt ◽  
...  
Keyword(s):  
Multiplex Pcr ◽  
Leaf Rust ◽  
Common Wheat ◽  
Fungal Pathogens ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Field Conditions ◽  
Pcr Marker ◽  
Specific Sequence ◽  
Cereal Species

Abstract Leaf rust caused by the fungus Puccinia recondita f. sp. tritici is one of the most dangerous diseases of common wheat. Infections caused by fungal pathogens reduce the quantity and quality of yields of many cereal species. The most effective method to limit plant infection is to use cultivars that show rust resistance. Genetically conditioned horizontal-type resistance (racial-nonspecific) is a desirable trait because it is characterized by more stable expression compared to major (R) genes that induce racially specific resistance, often overcome by pathogens. Horizontal resistance is conditioned by the presence of slow rust genes, which include genes Lr34 and Lr46. This study aimed to identify markers linked to both genes in 64 common wheat lines and to develop multiplex PCR reaction conditions that were applied to identify both genes simultaneously. The degree of infestation of the analyzed lines was also assessed in field conditions during the growing season of 2017 and 2018. Simple sequence repeat anchored-polymerase chain reaction (SSR-PCR) marker csLV was identified during analysis in line PHR 4947. The presence of a specific sequence has also been confirmed in multiplex PCR analyses. In addition to gene Lr34, gene Lr46 was identified in this genotype. Lines PHR 4947 and PHR 4819 were characterized by the highest leaf rust resistance in field conditions. During STS-PCR analyses, the marker wmc44 of gene Lr46 was identified in most of the analyzed lines. This marker was not present in the following genotypes: PHR 4670, PHR 4800, PHR 4859, PHR 4907, PHR 4922, PHR 4949, PHR 4957, PHR 4995, and PHR 4997. The presence of a specific sequence has also been confirmed in multiplex PCR analyses. Genotypes carrying the markers of the analyzed gene showed good resistance to leaf rust in field conditions in both 2017 and 2018. Research has demonstrated that marker assisted selection (MAS) and multiplex PCR techniques are excellent tools for selecting genotypes resistant to 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.

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