Journal ArticleDOI
Intergeneric transfer (rye to wheat) of a gene(s) for Russian wheat aphid resistance
G. F. Marais,M. Horn,F. Du Torr +2 more
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An octoploid triticale was derived from the F 1 of a Russian wheat aphid-resistant rye and recovered five euploid Russian-wheat-aphid- resistant plants.Abstract:
An octoploid triticale was derived from the F 1 of a Russian wheat aphid-resistant rye, «Turkey 77», and «Chinese Spring» wheat. The alloploid was crossed to common wheat, and to «Imperial» rye/«Chinese Spring» disomic addition lines. F 2 progeny from these crosses were tested for Russian wheat aphid resistance and C-banded. A resistance gene(s) was found to be associated with chromosome arm 1RS of the «Turkey 77» rye genome. A monotelosomic 1RS («Turkey 77») addition plant was then crossed with the wheat cultivar «Gamtoos», which has the 1BL.1RS «Veery» translocation. Unlike the 1RS segment in «Gamtoos», the «Turkey 77»-derived 1RS telosome did not express the rust resistance genes Sr31 and Lr26, which could then be used as markers. From the F 1 a monotelosomic 1RS addition plant that was also heterozygous for the 1BL.1RS translocation was selected and testcrossed with an aphid-susceptible common wheat, «Inia 66». Meiotic pairing between the rye arms resulted in the recovery of five euploid Russian-wheat-aphid-resistant plants. One recombinant also retained Sr31 and Lr26 and was selfed to produce translocation homozygotesread more
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Journal ArticleDOI
Characterization of wheat-alien translocations conferring resistance to diseases and pests: current status
TL;DR: The present review summarizes the available data on wheat-alien transfers conferring resistance to diseases and pests and should be useful for further directed chromosome engineering aimed at producing superior germplasm.
Journal ArticleDOI
Occurrence of a New Russian Wheat Aphid Biotype in Colorado
TL;DR: This work confirmed observations in spring 2003 suggesting that a new biotype of RWA was present in southeastern Colorado, and induced greater injury than the original biotype in standard greenhouse seedling screening tests with a limited collection of resistant and susceptible cultivars.
Journal ArticleDOI
Microsatellite markers linked to six Russian wheat aphid resistance genes in wheat
TL;DR: Results confirm that Dn1, Dn2 and Dn5 are tightly linked to each other, and provide new information about their location, being 7DS, near the centromere, instead of as previously reported on 7DL.
Book ChapterDOI
Breeding Wheat for Resistance to Insects
William A. Berzonsky,Hongjian Ding,Scott D. Haley,Marion O. Harris,Robert J. Lamb,R. I. H. McKenzie,Herbert W. Ohm,Fred L. Patterson,Frank B. Peairs,David R. Porter,Roger H. Ratcliffe,Thomas G. Shanower +11 more
Journal ArticleDOI
Identification of microsatellite markers linked to Russian wheat aphid resistance genes Dn4 and Dn6.
TL;DR: This is the first report on the chromosomal location of Dn6, which proved to be either allelic or tightly linked to Dn1, Dn2 and Dn5.
References
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Journal ArticleDOI
Correlations between the inheritance of certain high‐molecular weight subunits of glutenin and bread‐making quality in progenies of six crosses of bread wheat
TL;DR: The results are discussed in relation to (i) the relative positions of the glutenin genes on the group 1 chromosomes; and (ii) future strategies for breeding wheats with improved bread-making quality.
Journal ArticleDOI
Genetic variation and phylogenetic relationships among worldwide collections of the Russian wheat aphid, Diuraphis noxia (Mordvilko), inferred from allozyme and RAPD-PCR markers
TL;DR: Allozyme variation was absent within most populations, particularly within those countries where the species was recently introduced, and cluster analyses indicated strong similarities between U.S.A. populations and collections from South Africa, Mexico, France and Turkey.
Book ChapterDOI
The introduction of alien genetic variation in wheat
M. D. Gale,T. E. Miller +1 more
TL;DR: By exploiting the homoeologous relationships between the genomes of related species and those of hexaploid wheat, Triticum aestivum, it is now possible to take genes or chromosome segments from several of the genera comprising the tribe and incorporate them into bread wheat.
Journal ArticleDOI
Linkage mapping of genes for resistance to leaf, stem and stripe rusts and ω-secalins on the short arm of rye chromosome 1R.
TL;DR: It should be possible but difficult to separate the rust resistance genes from the secalin gene(s), which are thought to contribute to dough stickiness of wheat-rye translocation lines carrying 1RS.
Journal ArticleDOI
Controlled introgression to wheat of genes from rye chromosome arm 1RS by induction of allosyndesis : 2. Characterisation of recombinants.
TL;DR: These two recombinant chromosomes appear to have approximately reciprocal structures and may prove of direct benefit to wheat breeders as they retain the stem rust resistance of the parental translocation but have recovered some of the 1D encoded proteins which are absent in 1DL-1RS lines and which are thought to affect dough quality.