TRANSFER OF LEAF RUST RESISTANCE FROM AEGILOPS SPELTOIDES TO TRITICUM AESTIVUM

1977 ◽  
Vol 19 (1) ◽  
pp. 133-141 ◽  
Author(s):  
J. Dvořák
Keyword(s):  
Leaf Rust ◽  
Chromosome Pairing ◽  
Dominant Gene ◽  
Leaf Rust Resistance ◽  
Aegilops Speltoides ◽  
Wheat Cultivars ◽  
Homoeologous Chromosome Pairing ◽  
Resistant Lines ◽  
Genomic Relationships ◽  
Origin Of Polyploids

Five accessions of Aegilops speltoides resistant to race 5 of leaf rust were crossed and backcrossed four or five times to wheat cultivars Manitou and Neepawa. The resistance transferred from each accession to the recurrent parents appeared to be controlled by one incompletely dominant gene. Since a majority of resistant lines show complete chromosome pairing when heterozygous and segregate in a monofactorial ratio of 3 resistant to 1 susceptible, the Aegilops genes must be on wheat chromosomes. The present experiment shows that if extensive homoeologous chromosome pairing occurs in the F1 hybrids, introgression can occur directly from a diploid into a hexaploid. The origin of polyploids in the Triticum-Aegilops polyploid complex is briefly discussed, and it is stressed that polyploidy is closely and inversely related to introgression. Whether introgression or polyploidy is going to occur depends largely on the genomic relationships and the extent of chromosome pairing in the F1 hybrid.

scholarly journals Cytogenetic analysis and mapping of leaf rust resistance in Aegilops speltoides Tausch derived bread wheat line Selection2427 carrying putative gametocidal gene(s)

Genome ◽  
2017 ◽  
Vol 60 (12) ◽  
pp. 1076-1085 ◽  
Author(s):  
M. Niranjana ◽  
Vinod ◽  
J.B. Sharma ◽  
Niharika Mallick ◽  
S.M.S. Tomar ◽  
...  
Keyword(s):  
Leaf Rust ◽  
Bread Wheat ◽  
Rust Resistance ◽  
Dominant Gene ◽  
Puccinia Triticina ◽  
Leaf Rust Resistance ◽  
Aegilops Speltoides ◽  
Lr Genes ◽  
Gametocidal Gene ◽  
Chromosome 3B

Leaf rust (Puccinia triticina) is a major biotic stress affecting wheat yields worldwide. Host-plant resistance is the best method for controlling leaf rust. Aegilops speltoides is a good source of resistance against wheat rusts. To date, five Lr genes, Lr28, Lr35, Lr36, Lr47, and Lr51, have been transferred from Ae. speltoides to bread wheat. In Selection2427, a bread wheat introgresed line with Ae. speltoides as the donor parent, a dominant gene for leaf rust resistance was mapped to the long arm of chromosome 3B (LrS2427). None of the Lr genes introgressed from Ae. speltoides have been mapped to chromosome 3B. Since none of the designated seedling leaf rust resistance genes have been located on chromosome 3B, LrS2427 seems to be a novel gene. Selection2427 showed a unique property typical of gametocidal genes, that when crossed to other bread wheat cultivars, the F1 showed partial pollen sterility and poor seed setting, whilst Selection2427 showed reasonable male and female fertility. Accidental co-transfer of gametocidal genes with LrS2427 may have occurred in Selection2427. Though LrS2427 did not show any segregation distortion and assorted independently of putative gametocidal gene(s), its utilization will be difficult due to the selfish behavior of gametocidal genes.

Transfer to hexaploid wheat of linked genes for adult-plant leaf rust and seedling stem rust resistance from an amphiploid of Aegilops speltoides × Triticum monococcum

Genome ◽  
1990 ◽  
Vol 33 (4) ◽  
pp. 530-537 ◽  
Author(s):  
E. R. Kerber ◽  
P. L. Dyck
Keyword(s):  
Leaf Rust ◽  
Resistance Genes ◽  
Stem Rust ◽  
Rust Resistance ◽  
Dominant Gene ◽  
Leaf Rust Resistance ◽  
Stem Rust Resistance ◽  
Adult Plant ◽  
Aegilops Speltoides ◽  
Plant Leaf

A partially dominant gene for adult-plant leaf rust resistance together with a linked, partially dominant gene for stem rust resistance were transferred to the hexaploid wheat cultivar 'Marquis' from an amphiploid of Aegilops speltoides × Triticum monococcum by direct crossing and backcrossing. Pathological evidence indicated that the alien resistance genes were derived from Ae. speltoides. Differential transmission of the resistance genes through the male gametes occurred in hexaploid hybrids involving the resistant 'Marquis' stock and resulted in distorted segregation ratios. In heterozygotes, pairing between the chromosome arm with the alien segment and the corresponding arm of the normal wheat chromosome was greatly reduced. The apparent close linkage between the two resistance genes, 3 ± 1.07 crossover units, was misleading because of this decrease in pairing in the presence of the 5B diploidizing mechanism. The newly identified gene for adult-plant leaf rust resistance, located on chromosome 2B, is different from adult-plant resistance genes Lr12, Lr13, and Lr22 and from that in the hexaploid accession PI250413; it has been designated Lr35. It is not known whether the newly transferred gene for stem rust resistance differs from Sr32, also derived from Ae. speltoides and located on chromosomes 2B.Key words: hexaploid, Triticum, Aegilops, aneuploid, Puccinia graminis, Puccinia recondita.

scholarly journals Identification of Leaf Rust Resistance Genes in Selected Wheat Cultivars and Development of Multiplex PCR

2019 ◽  
Vol 14 (1) ◽  
pp. 327-334 ◽  
Author(s):  
Agnieszka Tomkowiak ◽  
Roksana Skowrońska ◽  
Alicja Buda ◽  
Danuta Kurasiak-Popowska ◽  
Jerzy Nawracała ◽  
...  
Keyword(s):  
Multiplex Pcr ◽  
Leaf Rust ◽  
Resistance Genes ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Field Resistance ◽  
Wheat Cultivars ◽  
Pcr Conditions ◽  
Rust Resistance Genes ◽  
Leaf Rust Resistance Genes

AbstractTen leading wheat cultivars originating from the Plant Breeding and Acclimatization Institute (IHAR) - National Research Institute (Poland) and the Department of Gene Bank (Czech Republic) were used to establish a field experiment in 2017 and 2018 at the Dłoń Experimental Farm. The analyzed wheat genotypes were characterized by diversified field resistance to leaf rust. Jubilatka, Thatcher and Sparta were the most resistant cultivars in field conditions in both 2017 and 2018. The aim of the work was to identify the Lr11, L13, Lr16 and Lr26 genes encoding resistance to leaf rust using molecular SSR markers (wmc24, wmc261, Xgwm630, Xwmc764 and P6M12) and to develop multiplex PCR conditions to accelerate identification of these genes. Markers of three leaf rust resistance genes have been identified simultaneously in these cultivars. Jubilatka, Thatcher and Sparta cultivars may serve as a good source of the analyzed leaf rust resistance genes. In addition, multiplex PCR conditions have been developed for the simultaneous identification of the Lr11 and Lr16 and Lr11 and Lr26 gene pairs.

scholarly journals Leaf Rust Resistance of 35 Wheat Cultivars (Lines)

2018 ◽  
Vol 09 (01) ◽  
Author(s):  
Li J ◽  
Shi L ◽  
Wang X ◽  
Zhang N ◽  
Wei X ◽  
...  
Keyword(s):  
Leaf Rust ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Wheat Cultivars

scholarly journals Presence of a Translocation from Aegilops ventricosa in Wheat Cultivars Registered in the Czech Republic

2011 ◽  
Vol 40 (No. 2) ◽  
pp. 31-35 ◽  
Author(s):  
P. Bartoš ◽  
J. Ovesná ◽  
A. Hanzalová ◽  
J. Chrpová ◽  
V. Dumalasová ◽  
...  
Keyword(s):  
Czech Republic ◽  
Leaf Rust ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Wheat Cultivars ◽  
Pcr Marker ◽  
Aegilops Ventricosa ◽  
The Czech Republic ◽  
Rust Resistance Genes ◽  
Leaf Rust Resistance Genes

The presence of a translocation from Aegilops ventricosa carrying the genes for rust resistance Yr17, Lr37 and Sr38 was analysed in recently registered, mostly western European wheat cultivars in the Czech Republic. By means of a PCR marker the presence of the translocation was determined in cvs. Bill, Clarus, Clever, Corsaire, Rapsodia, and in the Czech cv. Rheia. Novel are the data for cvs. Rapsodia, Clarus and Rheia. Infection tests indicated the presence of additional leaf rust resistance genes in cultivars with the translocation, except in cv. Rheia. Segregating progenies of six crosses between cv. Renan possessing Lr37and different cultivars susceptible to leaf rust were tested for the presence of the translocation with Yr17, Lr37 and Sr38 by an infection test as well as by a molecular marker. High coincidence between the results from infection tests and those by the marker has been proved.  

Sign in / Sign up

Export Citation Format

Share Document