Resistance to stem rust in barley and inheritance of resistance to race QCC

1995 ◽  
Vol 75 (4) ◽  
pp. 781-788 ◽  
Author(s):  
S. L. Fox ◽  
D. E. Harder
Keyword(s):  
Hordeum Vulgare ◽  
Stem Rust ◽  
Rust Resistance ◽  
Phenotypic Expression ◽  
Stem Rust Resistance ◽  
Moderate Level ◽  
Puccinia Graminis ◽  
Inheritance Of Resistance ◽  
Heterozygous Condition ◽  
The Cross

Twenty-two barley (Hordeum vulgare L.) cultivars and lines were evaluated for resistance to stem rust (Puccinia graminis Pers. f. sp. tritici Eriks. & Henn.) race QCC in field trials over a 3-yr period, and the inheritance of resistance of several genotypes to race QCC was investigated using replicated F3 lines. Rust severities ranged from 17 to 58% between 14 different cultivars and lines which carried the stem rust resistance gene Rpg1, indicating that factors other than Rpg1 conferred resistance. Hietpas-5 (Rpg2) had moderate resistance while PI 382313 (Rpg3) had good resistance to race QCC. In the cross Hiproly-15/Peatland-9, F2 adult plants segregated 3R: 1S to race MCC, confirming the presence of gene Rpg1 in Peatland-9. Some F3 lines derived from F2 plants with Rpg1 were susceptible to race QCC, however, indicating that Rpg1 was ineffective against race QCC. A second gene in Peatland-9, designated for the interim as RpgU and independent of Rpg1, was shown to confer a moderate level of resistance to race QCC. Similar segregation patterns in the presence of race QCC and pedigree analysis suggested that the cultivars Husky and Diamond contain this gene. This gene is likely present in other related cultivars such as Vantage and Bonanza. Segregation in progeny of the cross Hiproly-15/Q21861 indicated that resistance to race QCC was controlled by two recessive genes in Q21861. Gene Rpg2, tested in F3 lines, was found to provide a moderate level of resistance to race QCC, similar to RpgU, but was less effective in the heterozygous condition. The phenotypic expression of RpgU differed from Rpg1, Rpg2, and Rpg3, suggesting that RpgU is a previously unreported gene for stem rust resistance in cultivated barley. Key words: Barley, Hordeum vulgare, stem rust, Puccinia graminis, resistance

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.

The inheritance of stem rust resistance in Thatcher wheat

2000 ◽  
Vol 80 (1) ◽  
pp. 53-63 ◽  
Author(s):  
D. R. Knott
Keyword(s):  
Stem Rust ◽  
Rust Resistance ◽  
Triticum Aestivum L ◽  
Stem Rust Resistance ◽  
Puccinia Graminis ◽  
Single Seed Descent ◽  
Good Resistance ◽  
Canadian Prairies ◽  
Single Seed ◽  
Inheritance Of Rust Resistance

Thatcher was the predominant wheat (Triticum aestivum L.) cultivar on the Canadian prairies in the 1950s. Until race 15B (TMH) of stem rust (Puccinia graminis pers. f. sp. tritici Eriks. & Henn.) became widespread, Thatcher had good resistance to stem rust, but was susceptible to leaf rust (P. recondita f. sp. tritici Rob. ex Desm.). Although genes for stem rust resistance have been identified in Thatcher, the inheritance of its resistance has never been fully understood. The objective of this research was to attempt to elucidate the inheritance of the resistance of Thatcher and to determine why it had a reputation as a poor parent for rust resistance. Over a period of 40 yr, crosses and backcrosses to a susceptible genotype and two sets of single seed descent (SSD) lines were studied. The second set of SSD lines was tested with isolates of six races of stem rust to which Thatcher is resistant. The data showed that Thatcher is a very heterogenous cultivar with individual plants differing widely in the genes for stem rust resistance that they carry. The inheritance of rust resistance varied greatly from race to race and was often quite complex. Either complementary genes or a gene plus a suppressor appeared to condition resistance to one race. Most genes gave resistance to only one race. The presence of Sr5, which Thatcher is known to have obtained from Kanred, was confirmed. Most of its many additional genes probably came from Iumillo durum wheat. Key words: Stem rust, Thatcher wheat, single seed descent

THE INHERITANCE OF RUST RESISTANCE. III. THE INHERITANCE OF STEM RUST RESISTANCE IN NINE KENYA VARIETIES OF COMMON WHEAT

1957 ◽  
Vol 37 (4) ◽  
pp. 366-384 ◽  
Author(s):  
D. R. Knott
Keyword(s):  
Genetic Analysis ◽  
Common Wheat ◽  
Stem Rust ◽  
Rust Resistance ◽  
Hypersensitive Reaction ◽  
Stem Rust Resistance ◽  
Inheritance Of Resistance ◽  
Susceptible Parent ◽  
Inheritance Of Rust Resistance ◽  
Moderate Resistance

The inheritance of resistance to races 15B and 56 of stem rust was studied in the varieties Kenya 58, Kenya 117A, Kenya C9906, Kenya 338.AC.2.E.2, Kenya Governor, Kenya B286, Kenya 291.J.1.I.1, Kenya 321.BT.1.B.1 and Kenya 350.AD.9.C.2. The first five varieties had been studied previously and crosses involving them were not repeated. The genetic analysis of the varieties was based on diallel crosses and backcrosses to a susceptible parent, Marquis.All nine varieties proved to carry Sr7, a gene which conditions resistance to race 15B. Four varieties, Kenya 58, Kenya C9906, Kenya 291 and Kenya 350, carry the gene Sr6, which conditions a hypersensitive reaction to both race 15B and race 56. In addition, four of the varieties carry Sr9 and five carry Sr10, two genes which produce moderate resistance to race 56. Kenya 338.AC.2.E.2 carries two additional dominant, complementary genes, Sr11 and Sr12, which condition resistance to race 56.The genes, Sr9, Sr10, Sr11 and Sr12 are important modifiers of the resistance to race 15B conditioned by Sr7, with Sr9 probably having the greatest effect.

Rpg7: A New Gene for Stem Rust Resistance from Hordeum vulgare ssp. spontaneum

2020 ◽  
Author(s):  
Eva Celeste Henningsen ◽  
Ahmad Sallam ◽  
Oadi Matny ◽  
Tamas Szinyei ◽  
Melania Figueroa ◽  
...  
Keyword(s):  
Hordeum Vulgare ◽  
Resistance Gene ◽  
Stem Rust ◽  
Rust Resistance ◽  
Stem Rust Resistance ◽  
Wheat Stem Rust ◽  
Causal Organism ◽  
The Usa ◽  
New Gene ◽  
Hordeum Vulgare Ssp

Wheat stem rust (causal organism: Puccinia graminis f. sp. tritici; Pgt) is an important fungal disease that causes significant yield losses in barley. The deployment of resistant cultivars is the most effective means for controlling this disease. Stem rust evaluations of a diverse collection of wild barley (Hordeum vulgare ssp. spontaneum) identified two Jordanian accessions (WBDC094 and WBDC238) with resistance to a virulent pathotype (Pgt-HKHJC) from the USA. To elucidate the genetics of stem rust resistance, both accessions were crossed to the susceptible landrace Hiproly. Segregation ratios of F2 and F3 progeny indicated that a single dominant gene confers resistance to Pgt-HKHJC. Molecular mapping of the resistance locus was performed in the Hiproly x WBDC238 F2 population based on 3,329 SNP markers generated by genotyping by sequencing. Quantitative trait locus (QTL) analysis positioned the resistance gene to the long arm of chromosome 3H between the physical/genetic positions of 683.8 Mbp/172.9 cM and 693.7 Mbp/176.0 cM. Since this resistance gene is novel, it was assigned the new gene locus symbol of Rpg7 with a corresponding allele symbol of Rpg7.i. At the seedling stage, Rpg7 confers resistance against a number of other important Pgt pathotypes from the USA (MCCFC, QCCJB, and TTTTF) and Africa (TTKSK) as well as an isolate (92-MN-90) of the rye stem rust pathogen (P. graminis f. sp. secalis) from Minnesota. The resistance conferred by Rpg7 can be readily transferred into breeding programs due to its simple inheritance and clear phenotypic expression.

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.

Inheritance of leaf rust and stem rust resistances in wheat cultivars Agent and Agatha

1977 ◽  
Vol 28 (1) ◽  
pp. 37 ◽  
Author(s):  
RA McIntosh ◽  
PL Dyck ◽  
GJ Green
Keyword(s):  
Leaf Rust ◽  
Stem Rust ◽  
Rust Resistance ◽  
Wheat Chromosome ◽  
Wheat Breeding ◽  
Stem Rust Resistance ◽  
Puccinia Graminis ◽  
Wheat Cultivars ◽  
Agropyron Elongatum ◽  
Adult Plants

The wheat cultivars Agent and Agatha each possess closely linked genes for resistance to Puccinia graminis tritici and P. recondita derived from Agropyron elongatum. The genes in Agent, located in chromosome 3D, were designated Sr24 and Lr24. The gene in Agatha for resistance to P. graminis tritici was designated Sr25 and is linked with Lr19 in chromosome 7D. Both Agent and Agatha possess additional genes for resistance to certain cultures of P. graminis tritici. Sr24 is considered a valuable source of resistance for wheat-breeding purposes, but Sr25 conferred an inadequate level of resistance to adult plants. A translocation from an A. elongatum chromosome to wheat chromosome 6A, present in Australian cultivars Eagle, Kite and Jabiru, carries a third gene, Sr26, for stem rust resistance.

Virulence Characterization of Puccinia graminis f. sp. avenae and Resistance of Oat Cultivars in China

Plant Disease ◽  
2021 ◽  
Author(s):  
Tianya Li ◽  
Yiwei Xu ◽  
Xue Zhang ◽  
Xian Xin Wu ◽  
Yazhao Zhang ◽  
...  
Keyword(s):  
Stem Rust ◽  
Rust Resistance ◽  
Cost Effective ◽  
Stem Rust Resistance ◽  
Adult Plant ◽  
Puccinia Graminis ◽  
Resistant Cultivars ◽  
Oat Cultivars ◽  
First Time

Oat stem rust, caused by Puccinia graminis f. sp. avenae (Pga), is one of the most devastating diseases of oat. The most cost-effective and eco-friendly strategy to control this disease is the use of resistant cultivars. However, P. graminis f. sp. avenae can overcome the resistance of cultivars by rapidly changing its virulence. Thus, information on the virulence of P. graminis f. sp. avenae populations and resistance of cultivars is critical to control the disease. The current study was conducted to monitor the virulence composition and dynamics in the P. graminis f. sp. avenae population in China and to evaluate resistance of oat cultivars. Oat leaves naturally infected by P. graminis f. sp. avenae were collected during 2018 and 2019 and 159 isolates were derived from single uredinia. The isolates were tested on 12 international differential lines, and eight races, TJJ, TBD, TJB, TJD, TJL, TJN, TGD, and TKN, were identified for the first time in China. The predominant race was TJD, virulent against Pg1, Pg2, Pg3, Pg4, Pg8, Pg9, and Pg15, accounting for 35.8% and 37.8% in 2018 and 2019, respectively. The sub-predominant races were TJN (30.2% in 2018, 28.3% in 2019) and TKN (20.8% in 2018, 12.3% in 2019). All isolates were virulent to Pg1, Pg2, Pg3, and Pg4, and avirulent to Pg6 and Pg16. The three predominant races (TJD, TJN, and TKN) were used to evaluate resistance in 30 Chinese oat cultivars at the seedling and adult-plant stages. Five cultivars, Bayan 1, Baiyan 2, Baiyan 3, Baiyan 5, and Baiyan 9, were highly resistant to the three races at both seedling and adult-plant stages. The results of the virulences and frequencies of P. graminis f. sp. avenae races and the resistant cultivars will be useful in understanding the pathogen migration and evolution and for breeding oat cultivars with stem rust resistance.

scholarly journals Resistance in U.S. Wheat to Recent Eastern African Isolates of Puccinia graminis f. sp. tritici with Virulence to Resistance Gene Sr31

Plant Disease ◽  
2006 ◽  
Vol 90 (4) ◽  
pp. 476-480 ◽  
Author(s):  
Y. Jin ◽  
R. P. Singh
Keyword(s):  
Winter Wheat ◽  
Resistance Gene ◽  
Stem Rust ◽  
Rust Resistance ◽  
Stem Rust Resistance ◽  
Puccinia Graminis ◽  
Breeding Lines ◽  
Hard Red Winter Wheat ◽  
Soft Winter Wheat ◽  
Red Winter Wheat

The stem rust resistance gene Sr31 derived from rye has been used as an important source of stem rust resistance in many wheat cultivars worldwide. Isolates of Puccinia graminis f. sp. tritici with virulence to Sr31 were identified from Uganda in 1999. Stem rust susceptibility in wheat lines with Sr31 was observed in Kenya in 2003 and 2004. An isolate collected from Uganda in 1999 and an isolate collected from Kenya in 2004, identified to be race TTKS, were used in the rust evaluations. Selected cultivars and advanced breeding lines (450 in total) of wheat from the United States were tested against these two stem rust isolates. Resistance to race TTKS was detected in major classes of wheat with the following frequencies: 16% of hard red spring wheat, 48% of hard red winter wheat, and 27% of soft winter wheat. The genes that conferred resistance in the spring wheat have not been conclusively identified. Resistance in cultivar Ivan was likely due to Sr24. Resistance in hard red winter wheat was postulated to be primarily due to Sr24, and resistance in soft winter wheat was postulated to be primarily due to Sr36. The 1AL.1RS translocation present in many U.S. winter wheat cultivars and breeding lines appears to carry an effective resistance gene different from Sr31. The presence of resistance to race TTKS in the adapted germ plasm presents an opportunity to improve stem rust resistance in wheat.

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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