Stem-rust resistance in 'Canthatch' hexaploid wheat induced by a nonsuppressor mutation on chromosome 7DL

Genome ◽  
1991 ◽  
Vol 34 (6) ◽  
pp. 935-939 ◽  
Author(s):  
E. R. Kerber
Keyword(s):  
Stem Rust ◽  
Wheat Cultivar ◽  
Stem Rust Resistance ◽  
Ethyl Methanesulphonate ◽  
Puccinia Graminis ◽  
Common Wheat Cultivar ◽  
The Common ◽  
Or Genes ◽  
Derivatives Of ◽  
Dominant Suppressor

A recessive null mutation induced in the common wheat cultivar 'Canthatch' by ethyl methanesulphonate permits the expression of resistance to several cultures of stem rust to which this cultivar is susceptible. This susceptibility is due to a dominant suppressor on chromosome 7DL that inhibits resistance conferred by a gene or genes located elsewhere on the genomic complement. Genetical and cytogenetical evidence indicated that the mutation is simply transmitted and was induced either at the suppressor locus or at a locus closely linked with it, more than 50 crossover units from the centromere. Tentative results suggest that in addition to 'Canthatch', other backcross derivatives of the cultivar 'Thatcher', such as 'Katepwa' and 'Columbus', possess both the suppressor and the inactivated resistance gene(s). Consequently, incorporation of the mutant allele into these cultivars should permit the expression of inhibited resistance.Key words: hexaploid, Triticum, ethyl methanesulphonate, mutant, suppressor, Puccinia graminis.

Transfer of stem rust resistance to wheat from an Agropyron chromosome having a gametocidal effect

1983 ◽  
Vol 25 (3) ◽  
pp. 215-221 ◽  
Author(s):  
I. Kibirige-Sebunya ◽  
D. R. Knott
Keyword(s):  
Stem Rust ◽  
Seed Set ◽  
Mutant Gene ◽  
Stem Rust Resistance ◽  
Puccinia Graminis ◽  
Agropyron Elongatum ◽  
Male Gametes ◽  
Chromosome 5B ◽  
Second Procedure ◽  
Or Genes

Two procedures were used to induce homoeologous recombination between Agropyron elongatum (Host) Beauv. chromosome 7el2 and wheat chromosomes. One procedure involved the use of 'Chinese Spring' nullisomic 5B – tetrasomic 5D, and resulted in plants lacking chromosome 5B. In the second procedure, a line carrying the mutant gene ph1b was used, and plants were produced that had only a 5B chromosome carrying ph1b. Both procedures resulted in the transfer of a gene or genes for stem rust (Puccinia graminis tritici Eriks. and Henn.) resistance from chromosome 7el2 to wheat chromosomes. During the transfer process, it was discovered that both the whole Agropyron chromosome and the recombinant chromosomes showed preferential transmission through the female gametes, but not through the male gametes. On heterozygous plants seed set was greatly reduced. Apparently, the Agropyron chromosome or a gene carried by it had a gametocidal action that resulted in female gametes, which did not carry the gene, failing to function. However, homozygous lines showed normal fertility.

Genes for stem rust resistance in Thatcher wheat

2009 ◽  
Vol 89 (6) ◽  
pp. 1003-1008
Author(s):  
D R Knott
Keyword(s):  
Triticum Aestivum ◽  
Common Wheat ◽  
Stem Rust ◽  
Rust Resistance ◽  
Triticum Aestivum L ◽  
Stem Rust Resistance ◽  
Puccinia Graminis ◽  
Genetic Studies ◽  
Number Of Genes ◽  
The Common

The common wheat (Triticum aestivum L.) cultivar Thatcher has resistance to many of the older races of stem rust (Puccinia graminis Pers. f. sp. tritici Eriks. & Henn.). Several genetic studies have shown that its resistance is complex in inheritance. To attempt to clarify the inheritance, 28 lines, each believed to carry a single resistance gene from Thatcher, were developed. The lines were tested with 13 races of stem rust. They fell into 13 types with resistance to from 1 to 11 races. Of the five genes previously identified in Thatcher, only two, Sr9g, and Sr12, were present in the lines. Four lines carried named genes, Sr6, Sr7a, Sr8a and S9d, which had not previously been detected in Thatcher. Thatcher is resistant to 8 of the 13 races. At least one line was resistant to each of the 13 races, including the five to which Thatcher is susceptible. Eleven of the 13 types of lines were resistant to race MCCD to which Thatcher is resistant. Seven of the types were resistant to race TMRT(15B-1) to which Thatcher is susceptible. Clearly, the inheritance of resistance in Thatcher is very complex and involves a considerable number of genes. It carries a surprising number of genes that appear to be hidden by the presence of suppressor genes or transposons.Key words: Common wheat, Triticum aestivum, Puccinia graminis, suppressors, tansposons

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).

scholarly journals Seedling Stage Resistance of Iranian Bread Wheat Germplasm to Race Ug99 of Puccinia graminis f. sp. tritici

Plant Disease ◽  
2013 ◽  
Vol 97 (3) ◽  
pp. 387-392 ◽  
Author(s):  
Mohsen Mohammadi ◽  
Davoud Torkamaneh ◽  
Mehran Patpour
Keyword(s):  
Resistance Genes ◽  
Stem Rust ◽  
Rust Resistance ◽  
Stem Rust Resistance ◽  
Puccinia Graminis ◽  
Wheat Cultivars ◽  
Breeding Lines ◽  
Wheat Germplasm ◽  
Stem Rust Resistance Genes ◽  
Rust Resistance Genes

Following emergence of Ug99, the new virulent race of Puccinia graminis f. sp. tritici in Africa, a global effort for identification and utilization of new sources of Ug99-resistant germplasm has been undertaken. In this study, we conducted replicated experiments to evaluate the resistance of Iranian wheat germplasm to the TTKSK lineage of the Ug99 race of P. graminis f. sp. tritici. We also evaluated for presence of stem rust resistance genes (i.e., Sr2, Sr24, Sr26, Sr38, Sr39, Sr31, and Sr1RSAmigo) in wheat cultivars and breeding lines widely cultivated in Iran. Our phenotyping data revealed high levels of susceptibility to Ug99 in Iranian bread wheat germplasm. Our genotyping data revealed that Iranian cultivars do not carry Sr24, Sr26, or Sr1RSAmigo. Only a few salt-tolerant cultivars and breeding lines tested positively for Sr2, Sr31, Sr38, or Sr39 markers. In conclusion, the genetic basis for resistance to Ug99 in Iranian wheat cultivars was found to be vulnerable. Acquiring knowledge about existing resistance genes and haplotypes in wheat cultivars and breeding lines will help breeders, cereal pathologists, and policy makers to select and pyramid effective stem rust resistance genes.

A cytogenetic study of the blue-grain line of the common wheat cultivar Saratovskaya 29

2012 ◽  
Vol 48 (8) ◽  
pp. 785-791 ◽  
Author(s):  
V. S. Arbuzova ◽  
E. D. Badaeva ◽  
T. T. Efremova ◽  
T. S. Osadchaya ◽  
N. V. Trubacheeva ◽  
...  
Keyword(s):  
Common Wheat ◽  
Wheat Cultivar ◽  
Cytogenetic Study ◽  
Common Wheat Cultivar ◽  
The Common

Characterization of Stem Rust Resistance in Wheat Cultivar Gage

Crop Science ◽  
2015 ◽  
Vol 55 (1) ◽  
pp. 229-239 ◽  
Author(s):  
Tadele T. Kumssa ◽  
P.S. Baenziger ◽  
M.N. Rouse ◽  
M. Guttieri ◽  
I. Dweikat ◽  
...  
Keyword(s):  
Stem Rust ◽  
Rust Resistance ◽  
Wheat Cultivar ◽  
Stem Rust Resistance

Components of resistance in barley to stem rust: receptivity, urediniospore production, latent period, and infection response in adult plants

1996 ◽  
Vol 74 (8) ◽  
pp. 1298-1304 ◽  
Author(s):  
J. Q. Liu ◽  
D. E. Harder
Keyword(s):  
Hordeum Vulgare ◽  
Latent Period ◽  
Stem Rust ◽  
Specific Resistance ◽  
Wheat Cultivar ◽  
Puccinia Graminis ◽  
Barley Cultivars ◽  
Infection Response ◽  
Highly Correlated ◽  
Adult Plants

Resistance in barley (Hordeum vulgare) to stem rust, caused by Puccinia graminis f.sp. tritici, is often variably expressed. This study was undertaken to evaluate several components of stem rust resistance in the barley cultivars or lines Tupper, Robust, Q21861, SB90585, SB91702, and Harrington and to compare them with the susceptible wheat cultivar Little Club (Triticum aestivum). Stems of adult plants were quantitatively inoculated with urediniospores of races QCC, QFC, and TPM of P. graminis tritici. Significant differences in receptivity, urediniospore production, and latent period were observed among the barley lines and between all barley lines and Little Club wheat. The degrees of receptivity and the levels of urediniospore production on the barley lines were related to the presence or absence of the specific resistance genes Rpg1, rpg4, and possibly additional noncharacterized gene(s). Receptivity was the most strongly expressed of all of the components measured. Receptivity, spore production, and infection response were highly correlated to each other, but only infection response was significantly correlated to latent period. The usefulness of measuring these components to evaluate resistance in barley breeding is discussed. Keywords: barley, Hordeum vulgare, stem rust, Puccinia graminis tritici, resistance, components.

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