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.

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.

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.

ANEUPLOID ANALYSIS OF A GENE FOR LEAF RUST RESISTANCE DERIVED FROM THE COMMON WHEAT CULTIVAR TERENZIO

1981 ◽  
Vol 23 (3) ◽  
pp. 405-409 ◽  
Author(s):  
P. L. Dyck ◽  
E. R. Kerber
Keyword(s):  
Leaf Rust ◽  
Common Wheat ◽  
Rust Resistance ◽  
Wheat Cultivar ◽  
Leaf Rust Resistance ◽  
Triticum Aestivum L ◽  
Backcross Line ◽  
The Common ◽  
Aneuploid Analysis ◽  
Leaf Rust Resistance Genes

The LrT gene for resistance to leaf rust present in the common wheat (Triticum aestivum L.) backcross line RL 6049, and originally derived from the cultivar Terenzio, was shown to be on chromosome 4B. Farther analysis indicated that it is on the long arm of this chromosome, 2.9 ± 1.3 crossover units from the centromere. It is independent of or loosely linked with Sr7a, a gene for stem rust resistance known to be on the long arm of chromosome 4B. It is inherited independently of leaf rust resistance genes Lr1, Lr2a, Lr3, Lr10, Lr14b, Lr16, Lr17 and Lr18. LrT has been redesignated Lr30.

Leaf rust resistance in common wheat varieties and lines from the collection of the Vavilov Plant Industry Institute carrying alien genetic material

2015 ◽  
Vol 5 (3) ◽  
pp. 233-241 ◽  
Author(s):  
A. S. Sadovaya ◽  
E. I. Gultyaeva ◽  
O. P. Mitrofanova ◽  
E. L. Shaidayuk ◽  
A. G. Hakimova ◽  
...  
Keyword(s):  
Leaf Rust ◽  
Common Wheat ◽  
Rust Resistance ◽  
Genetic Material ◽  
Leaf Rust Resistance ◽  
Plant Industry ◽  
Wheat Varieties

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.

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