The inheritance of resistance to stem rust races 15B-1 and 56 in 'French Peace' wheat

1983 ◽  
Vol 25 (3) ◽  
pp. 283-285 ◽  
Author(s):  
D. R. Knott
Keyword(s):  
Triticum Aestivum ◽  
Stem Rust ◽  
Triticum Aestivum L ◽  
Puccinia Graminis ◽  
Inheritance Of Resistance ◽  
Puccinia Graminis Tritici ◽  
Tetraploid Wheats

'French Peace,' an old wheat (Triticum aestivum L.) cultivar, apparently brought to Saskatchewan by settlers, probably carries genes Sr7a, Sr9a, and Sr13 for resistance to stem rust (Puccinia graminis tritici Eriks. and Henn.). Since two of the three genes have been found in tetraploid wheats, 'French Peace' could be derived from a hexaploid × tetraploid cross.

Genetics of rust resistance in tetraploid wheats. III. Genes for resistance to stem rust in certain Durum wheats

1967 ◽  
Vol 18 (2) ◽  
pp. 213
Author(s):  
M Ataullah
Keyword(s):  
Stem Rust ◽  
Rust Resistance ◽  
Puccinia Graminis ◽  
Inheritance Of Resistance ◽  
Puccinia Graminis Tritici ◽  
Tetraploid Wheats ◽  
Recessive Genes ◽  
Dominant Genes

The inheritance of resistance to stem rust in four durum wheats, namely P.I.168921, P.I.173401, Gaza, and C.I.7809 was studied. The variety P.I.168921 was found to possess two dominant genes Srt1 and Srt5, P.I.173401 two recessive genes srt6 and srt7, Gaza two dominant genes Srt8 and Srt9, and C.I.7809 genes Srt33 and Srt10, for resistance to Australian strains of Puccinia graminis tritici Erikss. & Henn. It was observed that the genes srt6, srt7, Srt9, and Srt10 were independent of genes already identified. Varieties Khapli, St.464, C.I.7778, and P.I.168921 had gene Srt1Srt1 in common; and varieties St.464, C.I.7778, and C.I.7809 gene Srt3 in common.

The mode of inheritance of a type of dwarfism in common wheat

Genome ◽  
1989 ◽  
Vol 32 (5) ◽  
pp. 932-933 ◽  
Author(s):  
D. R. Knott
Keyword(s):  
Triticum Aestivum ◽  
Stem Rust ◽  
Rust Resistance ◽  
Dominant Gene ◽  
Recessive Gene ◽  
Triticum Aestivum L ◽  
Stem Rust Resistance ◽  
Puccinia Graminis ◽  
Puccinia Graminis Tritici ◽  
Dark Green

A type of dwarfism found in crosses involving the wheat (Triticum aestivum L.) cultivar Webster and a stem rust (Puccinia graminis tritici Erik. &Henn.) susceptible line, LMPG, proved to be due to a dominant gene from cv. Webster and a recessive gene from LMPG. The dominant gene is closely linked to the gene Sr30, which conditions stem rust resistance in cv. Webster and is on chromosome 5D. The dwarf plants have short, dark green, stiff leaves and rarely develop more than two leaves before dying.Key words: dwarfism, Triticum aestivum, Puccinia graminis tritici, stem rust.

INHERITANCE OF REACTION TO STEM RUST AND LEAF RUST IN THE WHEAT CULTIVAR ETOILE DE CHOISY

1974 ◽  
Vol 16 (3) ◽  
pp. 571-577 ◽  
Author(s):  
R. A. McIntosh ◽  
P. L. Dyck ◽  
G. J. Green
Keyword(s):  
Triticum Aestivum ◽  
Leaf Rust ◽  
Stem Rust ◽  
Wheat Cultivar ◽  
Infection Type ◽  
Triticum Aestivum L ◽  
Infected Tissue ◽  
Puccinia Graminis ◽  
Puccinia Graminis Tritici

Triticum aestivum L. cv. Etoile de Choisy possesses two genes governing reaction to Australian and Canadian strains of Puccinia graminis tritici: Sr23, a gene causing chlorosis and necrosis of infected tissue which is completely linked with Lr16 for reaction to P. recondita, and a second gene, designated SrEC, resembling a gene previously reported by Bartos et al., that produces infection type "2" to "3" with avirulent cultures.

GENETICS OF STEM RUST RESISTANCE IN THE WHEAT CULTIVAR RED BOBS

1970 ◽  
Vol 50 (3) ◽  
pp. 229-232 ◽  
Author(s):  
P. L. DYCK ◽  
G. J. GREEN
Keyword(s):  
Triticum Aestivum ◽  
Stem Rust ◽  
Rust Resistance ◽  
Wheat Cultivar ◽  
Triticum Aestivum L ◽  
Stem Rust Resistance ◽  
Puccinia Graminis ◽  
Inheritance Of Resistance

The inheritance of resistance to stem rust (Puccinia graminis Pers. f. sp. tritici Eriks. and E. Henn.) was investigated in Triticum aestivum L. cv. Red Bobs. It carries a gene for stem rust resistance at the Sr7 locus that resembles Sr7b of Marquis, and a gene that is either Sr10 or, more likely, an allele, because Red Bobs is less resistant than the Marquis-Sr10 line to races C1 (17) and C17 (56).

The chromosome location of four recombinants between Agropyron chromosome 7el2 and a wheat chromosome

Genome ◽  
1988 ◽  
Vol 30 (1) ◽  
pp. 97-98 ◽  
Author(s):  
D. R. Knott
Keyword(s):  
Triticum Aestivum ◽  
Stem Rust ◽  
Rust Resistance ◽  
Wheat Chromosome ◽  
Triticum Aestivum L ◽  
Puccinia Graminis ◽  
Monosomic Analysis ◽  
Chromosome Location ◽  
Homoeologous Recombination ◽  
Puccinia Graminis Tritici

Four stem rust (Puccinia graminis tritici Eriks. &Henn.) resistant wheat (Triticum aestivum L.) – Agropyron recombinants were analyzed to determine the wheat chromosomes involved. The Agropyron chromosome, 7el2, was known to be homoeologous to the group 7 chromosomes of wheat. Monosomic analysis showed that all four recombinants involved wheat chromosome 7D.Key words: rust resistance, Puccinia, Agropyron, wheat, Triticum, homoeologous recombination.

Histological studies on host-cell necrosis conditioned by the Sr6 gene for resistance in wheat to stem rust

1977 ◽  
Vol 55 (11) ◽  
pp. 1445-1452 ◽  
Author(s):  
D. J. Samborski ◽  
W. K. Kim ◽  
R. Rohringer ◽  
N. K. Howes ◽  
R. J. Baker
Keyword(s):  
Triticum Aestivum ◽  
Stem Rust ◽  
Fungal Growth ◽  
Triticum Aestivum L ◽  
Host Cells ◽  
Puccinia Graminis ◽  
Near Isogenic Lines ◽  
Cell Necrosis ◽  
Calcofluor White ◽  
Histological Studies

Seedlings of resistant (Sr6) and susceptible (sr6) near-isogenic lines of wheat (Triticum aestivum L.) were inoculated with a race of stem rust (Puccinia graminis Pers. f. sp. tritici Eriks. & E. Henn.) that was avirulent on the line with Sr6 and they were kept at 19, 25, 26, and 27 °C. Fluorescence microscopy was used to detect autofluorescing necrotic host cells and rust colonies after these were stained with a fiuorochrome (Calcofluor White M2R New).In leaves containing the Sr6 gene, a smaller percentage of colonies grown at 25 °C had necrotic cells associated with them than those that were grown at 19 °C. The incidence of colony-associated necrosis in these leaves could be further reduced by increasing the temperature to 26 °C and 27 °C. Similarly, the number of necrotic host cells per colony decreased with an increase in temperature. Colonies in genotypically resistant leaves were usually smaller than those in genotypically susceptible leaves, but the differences in colony sizes between these two lines decreased at the higher temperatures.When infected plants containing the Sr6 gene were kept for varying times at 25 °C and then were transferred to 19 °C, there was significantly less fungal growth and more necrosis than in plants kept continuously at 25 °C. This necrosis occurred largely in those cells that were invaded after the transfer to 19 °C, when the Sr6 gene was activated.

THE EFFECTS OF GENOTYPE AND TEMPERATURE ON THE RESISTANCE TO PUCCINIA GRAMINIS TRITICI CONTROLLED BY THE GENE Sr6 IN TRITICUM AESTIVUM

1981 ◽  
Vol 23 (2) ◽  
pp. 183-190 ◽  
Author(s):  
D. R. Knott
Keyword(s):  
Triticum Aestivum ◽  
Genetic Background ◽  
Triticum Aestivum L ◽  
Complex Interaction ◽  
Puccinia Graminis ◽  
Susceptible Parent ◽  
Puccinia Graminis Tritici ◽  
Modifier Locus ◽  
Maximum Resistance ◽  
Growth Chambers

A line of wheat (Triticum aestivum L.). Kenya 58/10* Marquis (K58Mq10), homozygous for gene Sr6 for resistance to stem rust (Puccinia graminis tritici Eriks. and Henn.), was crossed with four rust susceptible cultivars or lines. The F1 seedlings were tested with rust races 56 and 15B-1, twice under greenhouse conditions and three times in growth chambers, and F2 seedlings were tested twice in the greenhouse. In conditions that resulted in maximum resistance, Sr6 was dominant with both race 56 and race 15B-1 in two crosses, dominant with race 56 and recessive with race 15B-1 in one cross, and recessive with both races in the fourth cross. Thus, the dominance of Sr6 depended on the susceptible parent with which K58Mq10 had been crossed. The data indicated that the dominance of Sr6 was not controlled either by a single independent modifier locus or by the general genetic background of the susceptible parents. Although the possibility of a linked modifier has not been eliminated, it appears that the results may be due to the effects of different alleles for susceptibility at the Sr6 locus. The degree of resistance conditioned by Sr6 is determined by a complex interaction between genotype and environment.

Inheritance of resistance to stem rust in 'Bonza', 'Chris', 'FKN-II-50-17', 'MRFY', 'Thatcher', 'Marquillo', and 'Hope' wheats

Genome ◽  
1988 ◽  
Vol 30 (2) ◽  
pp. 269-276
Author(s):  
M. Padidam ◽  
D. R. Knott
Keyword(s):  
Triticum Aestivum ◽  
Plant Resistance ◽  
Stem Rust ◽  
Adult Plant Resistance ◽  
Major Gene ◽  
Triticum Aestivum L ◽  
Adult Plant ◽  
Puccinia Graminis ◽  
Seedling Resistance ◽  
Minor Genes

Resistance to stem rust (Puccinia graminis Pers. f. sp. tritici Eriks, and Henn.), particularly adult plant resisitance to race 15B-1, was studied in seven wheat (Triticum aestivum L.) cultivars or lines: 'Bonza', 'Chris', 'FKN-II-50-17', 'MRFY', 'Thatcher', 'Marquillo', and 'Hope'. Each of the seven was crossed with a susceptible parent and either F4- or F5-derived lines developed by single seed descent. All of the lines were tested with race 15B-1 in field nurseries. Lines derived from parents carrying seedling resistance to race 15B-1 were also tested as seedlings in the greenhouse with race 15B-1, and in some cases races 56, 29, and C65. The data indicated that 'Bonza' carries Sr6, probably Sr5, an unidentified gene giving resistance to race 56, two unidentified genes for resistance to race C65, and two minor genes that combine to produce intermediate adult plant resistance. 'Chris' carries Sr5, Sr7a, Sr8a, and Sr12. In addition, it may have three minor genes for adult plant resistance. 'FKN-II-50-17' carries Sr6 and may have four minor genes that combine to produce moderate adult plant resistance. 'MRFY', which is seedling susceptible to race 15B-1, carries Sr9b, possibly Sr5, plus an unidentified gene for resistance to C65. In addition, it appears to have one major gene for adult plant resistance plus two or more minor genes. 'Thatcher', 'Marquillo', and 'Hope' had only limited resistance to race 15B-1 in the field and no genetic analysis of their crosses was possible. The four parents that had good resistance to race 15B-1 in the field, 'Bonza', 'Chris', 'FKN-II-50-17', and 'MRFY', all carry minor genes for adult plant resistance that had little effect individually but produced moderate resistance when combined. The genes Sr5 and Sr9b, which have no effect on resistance to 15B-1 is seedlings, were found to significantly increase resistance in adult plants in the field.Key words: stem rust, Puccinia graminis tritici, wheat, Triticum aestivum, adult plant rust resistance.

GENETICS OF STEM RUST RESISTANCE IN WHEAT CULTIVARS ROMANY, Es.P 518/9, BONNY AND TAMA

1975 ◽  
Vol 17 (4) ◽  
pp. 667-674 ◽  
Author(s):  
P. L. Dyck ◽  
G. J. Green
Keyword(s):  
Triticum Aestivum ◽  
Stem Rust ◽  
Rust Resistance ◽  
Triticum Aestivum L ◽  
Stem Rust Resistance ◽  
Puccinia Graminis ◽  
Wheat Cultivars ◽  
Genetics Of Resistance ◽  
Seedling Resistance ◽  
Moderate Resistance

The genetics of resistance to stem rust (Puccinia graminis tritici) was investigated in wheat (Triticum aestivum L.) cultivars Romany, Es.P 518/9, Bonny and Tama that are resistant to many races in both Canada and Kenya. Seedling resistance in the four cultivars to 12 Canadian races is controlled primarily by previously identified genes. The results indicate that the cultivars have the following genes: Romany — Sr5, Sr6, Sr7a, Sr9b and SrW; Es.P 518/9 — Sr5, Sr6, Sr7a, Sr8, Sr9b, SrW and possibly Sr17; Bonny — Sr6 and Sr11; and Tama — Sr6 and Sr8. Gene SrW confers moderate resistance and is also present in the cultivar Webster.

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