THE INHERITANCE OF RUST RESISTANCE: VII. THE INHERITANCE OF RESISTANCE TO RACES 15B AND 56 OF STEM RUST IN ELEVEN COMMON WHEAT VARIETIES OF DIVERSE ORIGIN

1961 ◽  
Vol 41 (3) ◽  
pp. 587-601 ◽  
Author(s):  
D. R. Knott ◽  
I-Sun Shen
Keyword(s):  
Stem Rust ◽  
Rust Resistance ◽  
Inheritance Of Resistance ◽  
Susceptible Parent ◽  
Wheat Varieties ◽  
New Genes ◽  
New Gene ◽  
Diverse Origin ◽  
Inheritance Of Rust Resistance ◽  
Moderate Resistance

In an attempt to locate new genes for stem rust resistance, 11 varieties of wheat of as diverse origins as possible were studied. Each variety was backcrossed to the susceptible parent Marquis. The F2 families from the backcrosses were tested with races 15B and 56, and the inheritance of resistance determined. The genes carried by each variety were identified from the results of test crosses with varieties carrying known genes and with lines of Marquis carrying single genes for resistance. Most of the resistance present in the 11 varieties could be accounted for on the basis of known genes (Sr6 – Sr10). However, at least one new gene conditioning moderate resistance to race 15B, and possibly one or more new genes conditioning moderate resistance to race 56, were identified.

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.

THE INHERITANCE OF RUST RESISTANCE: V. THE INHERITANCE OF RESISTANCE TO RACE 15B OF STEM RUST IN TEN VARIETIES OF DURUM WHEAT

1959 ◽  
Vol 39 (3) ◽  
pp. 316-328 ◽  
Author(s):  
E. O. Kenaschuk ◽  
R. G. Anderson ◽  
D. R. Knott
Keyword(s):  
Durum Wheat ◽  
Stem Rust ◽  
Rust Resistance ◽  
Inheritance Of Resistance ◽  
Diallel Crosses ◽  
Golden Ball ◽  
Inheritance Of Rust Resistance

The inheritance of resistance to race 15B of stem rust was studied in the varieties St. 464, C.I. 7805, Amarai bianco tipo 142 (P.I. 192179), Arabian, Camadi Abdu tipo 103, Rojal de Almeria (P.I. 191194), C.I. 7870, C.I. 7875, C.I. 8133 and Golden Ball. Rust tests were conducted on F2 plants from diallel crosses and on F2 families from back-crosses to the susceptible varieties, Stewart and Nugget. The following genes are present in the varieties:1. Srd2 conditioning a type 1-X reaction and present in St. 464, C.I. 7805, P.I. 192179, C.I. 7870, C.I. 7875 and C.I. 8133.2. Srd4 conditioning a type 2–2+ reaction and present in Arabian, P.I. 191194 and Golden Ball.3. Srd5 conditioning a type 2 reaction and present in the same varieties as Srd2, plus Arabian.4. Srd6 conditioning a type 1−–1 reaction in Camadi.Two of the genes, Srd2 and Srd5, are additive in effect and together condition a type O; to 1− reaction.

Reactions to stem rust and genetics of stem rust resistance in European wheat varieties

1970 ◽  
Vol 48 (8) ◽  
pp. 1439-1443 ◽  
Author(s):  
P. Bartoš ◽  
G. J. Green ◽  
P. L. Dyck
Keyword(s):  
Stem Rust ◽  
Rust Resistance ◽  
Single Gene ◽  
Stem Rust Resistance ◽  
Wheat Varieties ◽  
Group 4 ◽  
Group 3 ◽  
Group 5 ◽  
Group 2 ◽  
Moderate Resistance

Thirty-four European wheat cultivars were classified into eight groups according to their reactions to seven North American races of Puccinia graminis f. sp. tritici. Cultivars of seven groups were crossed with a variety or single gene line having similar rust reactions. These crosses indicated that the resistance of Hybrid 80-3, Stabil, and Vrakuňská (group 1) was conferred by stem rust resistance gene Sr5; Admonter Früh (group 2) carries Sr5 and an unidentified gene; Flevina (group 4) carries Sr11; Erythrospermum 974 (group 5) carries Sr5 and Sr8; Étoile de Choisy (group 6) carries an unidentified gene for moderate resistance to all the races used; and Mironovskaja 808 (group 7) and Belocerkovskaja 198 (group 8) each carry an unidentified gene. The five cultivars in group 3 were not studied genetically but they react like Marquis and may carry Sr7b.

INHERITANCE OF RESISTANCE TO STEM RUST RACES 15B AND 56 IN EIGHT CULTIVARS OF COMMON WHEAT

1977 ◽  
Vol 57 (3) ◽  
pp. 633-641 ◽  
Author(s):  
D. R. KNOTT ◽  
J. P. SRIVASTAVA
Keyword(s):  
Common Wheat ◽  
Spring Wheat ◽  
Stem Rust ◽  
Rust Resistance ◽  
Stem Rust Resistance ◽  
Inheritance Of Resistance ◽  
Major Genes ◽  
Moderate Resistance ◽  
Wheat Rust

Eight cultivars of common wheat showing good stem rust resistance in International Spring Wheat Rust Nurseries were selected. They were backcrossed to the susceptible cultivars Marquis and Little Club and the inheritance of their resistance to races 15B and 56 was studied. The major genes carried by the cultivars had all been identified previously. The cultivars and the major genes carried by them were as follows: Andes Sib (Sr8, Sr9?), Colotana (Sr8), Giza-Hegazy (Sr7a, Sr9a or b) Huascav (Sr9d), S.A. 112/52 (Sr9d), Bonza Selection (Sr6), Kuntur (Sr6, Sr7a) and Maribal Marina (Sr7a). In addition, four of the cultivars carried one or more genes giving very moderate resistance to one or both of the races.

THE INHERITANCE OF RUST RESISTANCE. II. THE INHERITANCE OF STEM RUST RESISTANCE IN SIX ADDITIONAL VARIETIES OF COMMON WHEAT

1957 ◽  
Vol 37 (3) ◽  
pp. 177-192 ◽  
Author(s):  
D. R. Knott
Keyword(s):  
Common Wheat ◽  
Plant Resistance ◽  
Stem Rust ◽  
Rust Resistance ◽  
Susceptible Variety ◽  
Stem Rust Resistance ◽  
Inheritance Of Resistance ◽  
Mature Plant Resistance ◽  
Inheritance Of Rust Resistance ◽  
Additive Genes

The inheritance of resistance to races 15B and 56 of stem rust was studied in the varieties Africa No. 43, Kenya C9906, Kenya 338.AC.2.E.2, Egypt Na101, Veadeiro and Red Egyptian type (P.I. 170910). Each variety was analysed genetically on the basis of data obtained from a backcross to the rust susceptible variety Marquis. The interrelationships of the genes in the varieties were determined from diallel crosses. With the exception of Veadeiro, the varieties all carried various combinations of genes reported in the first paper of this series. Veadeiro has a mature plant resistance to race 15B which is probably conditioned by two additive genes not previously noted.

THE INHERITANCE OF RUST RESISTANCE: IX. THE INHERITANCE OF RESISTANCE TO RACES 15B AND 56 OF STEM RUST IN THE WHEAT VARIETY KHAPSTEIN

1962 ◽  
Vol 42 (3) ◽  
pp. 415-419 ◽  
Author(s):  
D. R. Knott
Keyword(s):  
Stem Rust ◽  
Rust Resistance ◽  
Wheat Variety ◽  
Inheritance Of Resistance ◽  
Inheritance Of Rust Resistance

The inheritance of resistance to races 15B and 56 of stem rust was studied in the variety Khapstein which obtained its resistance from Khapli emmer. Khapstein was found to carry gene Sr7 which controls resistance to race 15B and two additional genes, one conditioning a type 2 reaction to race 56 and a 2+ – 3 reaction to race 15B, and a second controlling a striking, grey necrosis around pustules produced by race 56. The two have been designated Sr13 and Sr14 respectively.

THE INHERITANCE OF RUST RESISTANCE. VI. THE TRANSFER OF STEM RUST RESISTANCE FROM AGROPYRON ELONGATUM TO COMMON WHEAT

1961 ◽  
Vol 41 (1) ◽  
pp. 109-123 ◽  
Author(s):  
D. R. Knott
Keyword(s):  
Gamma Rays ◽  
Stem Rust ◽  
Rust Resistance ◽  
Wheat Chromosome ◽  
Stem Rust Resistance ◽  
Thermal Neutrons ◽  
X Rays ◽  
Agropyron Elongatum ◽  
Inheritance Of Rust Resistance ◽  
Or Genes

The rust resistance of a 56-chromosome wheat-Agropyron derivative was found to be controlled by a gene or genes on a single Agropyron chromosome. Resistant wheat plants having 21II of wheat chromosomes plus a single added Agropyron chromosome were produced. Spikes of these plants were irradiated with either gamma rays or X-rays and seeds were irradiated with thermal neutrons. As a result of the irradiation, in at least five lines and possibly seven a piece of the Agropyron chromosome carrying the gene or genes for rust resistance was transferred to a wheat chromosome. One of the translocations is transmitted normally through the gametes but the remaining six show irregularities in transmission particularly through the pollen.

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

NEW GENES FOR RESISTANCE TO RACES OF OAT STEM RUST

1961 ◽  
Vol 39 (3) ◽  
pp. 513-518 ◽  
Author(s):  
J. N. Welsh ◽  
G. J. Green ◽  
R. I. H. McKenzie
Keyword(s):  
Stem Rust ◽  
Major Gene ◽  
Single Gene ◽  
Puccinia Graminis ◽  
Major Genes ◽  
F Gene ◽  
E Gene ◽  
New Genes ◽  
New Gene ◽  
New Races

The inheritance in oats of reaction to some new races and to some well-known races of oat stem rust, Puccinia graminis Pers. f. sp. avenae Erikss. and Henn., was investigated in the crosses Jostrain × Eagle, Canuck × Cherokee, and R.L. 524.1 (Hajira × Banner) × Eagle. The resistance of the variety Jostrain to races 1, 3, 4, 13, and 13A was conferred by a single gene, here designated as the E gene in accordance with the practice of designating genes for stem rust resistance by capital letters. Canuck, a derivative of Jostrain, carries the new E gene and the previously identified B gene. The resistance of R.L. 524.1 to all races is conferred by two major genes and a modifying gene. One of the major genes acts like the well-known B gene which confers resistance to all races except 6A, 7A, 8A, and 13A. The other major gene apparently is a new gene in oats for resistance to stem rust and is here designated the F gene. The F gene confers resistance to all races but a modifying gene is required along with it for resistance to race 7.

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