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.

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.

THE TRANSFER TO WHEAT AND HOMOEOLOGY OF AN AGROPYRON ELONGATUM CHROMOSOME CARRYING RESISTANCE TO STEM RUST

1977 ◽  
Vol 19 (1) ◽  
pp. 75-79 ◽  
Author(s):  
D. R. Knott ◽  
J. Dvořák ◽  
J. S. Nanda
Keyword(s):  
Stem Rust ◽  
Rust Resistance ◽  
Wheat Chromosome ◽  
Leaf Rust Resistance ◽  
Triticum Aestivum L ◽  
Stem Rust Resistance ◽  
Yellow Pigment ◽  
Homoeologous Group ◽  
Agropyron Elongatum ◽  
High Level

A stem rust resistant wheat-Agropyron derivative obtained from Dr. F. X. Laubscher was crossed and backcrossed to Triticum aestivum L. cv. Marquis to determine the inheritance of its resistance to stem rust. Resistance proved to be carried on an Agropyron chromosome. A substitution line was obtained in which the Agropyron chromosome had replaced wheat chromosome 7D. The Agropyron chromosome compensates well for 7D in both plants and gametes and must, therefore, be homoeologous with the chromosomes of group 7. It is homologous with chromosome 7el1, the Agropyron chromosome carrying leaf rust resistance in Agrus, and it is, therefore, designated 7el2. Like 7el1 it carries a gene that results in a high level of yellow pigment in the flour. The frequent occurrence of genes for rust resistance on Agropyron chromosomes of homoeologous group 7 suggests that they may be related by descent.

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.

scholarly journals Cellular and molecular characterization of a stem rust resistance locus on wheat chromosome 7AL

2016 ◽  
Vol 9 (1) ◽  
Author(s):  
Vincent Pujol ◽  
Jose Robles ◽  
Penghao Wang ◽  
Jen Taylor ◽  
Peng Zhang ◽  
...  
Keyword(s):  
Molecular Characterization ◽  
Stem Rust ◽  
Rust Resistance ◽  
Wheat Chromosome ◽  
Stem Rust Resistance ◽  
Resistance Locus

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.

Identification of a stem rust resistance locus effective against Ug99 on wheat chromosome 7AL using a RAD-Seq approach

2015 ◽  
Vol 128 (7) ◽  
pp. 1397-1405 ◽  
Author(s):  
Vincent Pujol ◽  
Kerrie L. Forrest ◽  
Peng Zhang ◽  
Matthew N. Rouse ◽  
Matthew J. Hayden ◽  
...  
Keyword(s):  
Stem Rust ◽  
Rust Resistance ◽  
Wheat Chromosome ◽  
Stem Rust Resistance ◽  
Resistance Locus

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.

A Chemically Induced Mutation for Stem Rust Resistance in ‘Little Club’ Wheat 1

Crop Science ◽  
1969 ◽  
Vol 9 (6) ◽  
pp. 838-839 ◽  
Author(s):  
L. H. Edwards ◽  
N. D. Williams ◽  
F. J. Gough ◽  
K. L. Lebsock
Keyword(s):  
Stem Rust ◽  
Rust Resistance ◽  
Stem Rust Resistance ◽  
Induced Mutation ◽  
Chemically Induced
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