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... 1. Crop improvement which is concerned with disease resistance must take into consideration: (a) The possible existence of physiologic forms of the pathogenic organism, (b) the need of a survey to determine the prevalence and distribution of the various forms, (c) the varietal reactions of the host to particular forms, (d) the reactions between host and parasite as definite genetic characters, and ...
... The inheritance of the three stem-rust reactions, i.e., near immunity, resistance, and susceptibility, has been studied in hybrids. Earlier data on crosses of Hope X Marquis and Hope X Reliance were interpreted to show that they were controlled by two genetic factor pairs. Data on an H-44 X Ceres cross showed a segregation similar to that previously obtained in the crosses of Hope X Marquis and Ho ...
... The inheritance of the three stem-rust reactions near-immunity, resistance, and susceptibility--has been further studied in hybrids. Earlier crosses were interpreted as showing that Hope has a single dominant inhibiting factor for near-immunity, that Marquis and Reliance have a major dominant factor for susceptibility, that H-44 carries both of these dominant factors, and that the resistant Ceres ...
hybrids; fungal diseases of plants; Puccinia graminis; crossing; disease resistance; Avena sativa; Ustilago segetum var. avenae; strains; artificial selection; Iowa
Abstract:
... Since the resistant selections considered in the foregoing were subjected in both greenhouse and field to epiphytotics of rust and smut much more severe than those ordinarily occurring under field conditions, it is believed that they will continue to be resistant to natural epiphytotics of these diseases unless some major change occurs in the physiologic-form flora of the corn belt region. These s ...
... SynopsisMerion bluegrass grown in solution culture produced lower yields of foliage under low levels of nitrogen and high levels of osmotic pressure than when treated with high nitrogen and low osmotic pressures. Turf was resistant to inoculation with Puccinia graminis Pers. at all treatment combinations. Numbers of Helminthosporium sativum Pammel, King, and Bakke lesions per leaf blade and averag ...
... Seedling resistance to physiologic race 111 (culture 111-SS2) of Puccinia graminis f. sp. tritici was conditioned by two and three independent genes, respectively, in the durum wheat P.I. 94701 and the common wheat Reliance. The infection type was lower when P.I. 94701 genes for resistance were combined in a single plant than when they occurred singly. One of the P.I. 94701 genes also conditioned ...
... Pathological and genetic studies involving ‘Chinese Spring’ substitution lines showed that the varieties ‘Kenya Farmer’ and ‘Sapporo No. I’ both carry the Sr7a gene for resistance to Puccinia graminis tritici on chromosome 4B (VIII). ‘Hope’ carries a different allele, Sr7b. The presence of the resistance gene Srll on chromosome 6B (X) of both ‘Timstein’ and Kenya Farmer was confirmed, as was the e ...
Puccinia graminis; Triticum aestivum; bacterial leaf streak; chromosomes; crossing; disease resistance; genotype; hard red spring wheat; major genes; monosomics; stem rust; temperature
Abstract:
... Reactions to “black chaff,” a physiologic disease, and to race 15B of stem rust (Puccinia graminis Pers.f.sp. tritici Eriks. & E. Henn.) were controlled by single partially dominant major genes in several crosses with Conley hard red spring wheat (Triticum aestivum L. en. Thell.). Resistance to stem rust was associated with susceptibility to “black chaff” with apparent linkage values ranging from ...
... We treated seeds of ‘Little Club’ wheat (Triticum aestivum L.) with ethyl methanesulfonate (EMS) and tested M. seedlings for reaction to stem rust (Puccinia graminis Pers. f. sp. tritici Eriks. & E. Henn.). Mutants resistant to races 111, 15B, and 32 of stem rust were recovered. Every resistant plant in the mutant family was light green in color; whereas, every susceptible plant was normal dark gr ...
... We studied the inheritance of resistance to culture 111-SS2 of Puccinia graminis Pers. f. sp. tritici Eriks. & E. Henri. in six tetraploid wheats (Triticum turgidum L.). Seedling reaction was determined in the backcross-F₂ and F₃ from crosses of six resistant wheats with the susceptible cultivar ‘Marruecos 9623.’ Three dominant genes conditioned resistance in each of the strains ‘C.I. 7805,’ ‘Acme ...
... We determined the chromosomal locations of genes for resistance to culture 111-SS2 of Puccinia graminis Pers. f. sp. tritici Eriks. & E. Henn. in Triticum aestivum L. em. Thell ssp. vulgare (Vill., Host) Mac Kay ‘Marquis’ and ‘Reliance’. Six wheat lines, Mq-A, Mq-B, Mq-C, R1-A, R1-B, and R1-C, which have monogenic resistance derived from Marquis/T. aestivum L. em. Thell ssp. compactum (Host) Mac K ...
... Tests of lines of ‘Chinese Spring‘ wheat (Triticum aestivum L.) with single pairs of chromosomes substituted from ‘Thatcher’ had indicated that chromosomes 2B and 3B carried similar genes for resistance to the stem-rust organism. Results of crosses between near-isogenic lines derived from the substitution lines show that the resistance gene in the 3B substitution line is Srl6, which is located on ...
... Wheat (Triticum aestivum) line ISr9d-Ra, having a gene (Sr9d) for resistance to stem rust (Puccinia graminis f. sp. tritici) from ‘Hope,2019; was crossed with ISr9a-Ra, having a gene (Sr9a) for resistance from ‘Red Egyptian.’ The purpose of the cross was to investigate the linkage or allelic relations between the two genes. The F₂ and F₃ were inoculated simultaneously with a culture of stem rust r ...
... Resistance of the Russian wheat (Triticum aestivum L.) cultivar ‘Skorospelka 3b’ to culture 111-SS2 of Puccinia graminis f. sp. tritici is conditioned by two dominant independent genes, tentatively designated SrSo1 and SrSo2. The relation of SrSol and SrSo2 to genes with permanent designations in the Sr series was not established. The two genes are independent of a single gene for resistance to cu ...
... The presence of genes for resistance to stem rust (Puccinia graminis Pers. f. sp. tritici Eriks. & E. Henn.) in wheat (Triticum aestivum L. em Thell.) was detected in entries of the 4th International Winter Wheat Performance Nursery by use of 18 isolates of rust previously characterized for virulence on 12 genes. Several varieties appeared to have one or two genes in common³. The test isolates det ...
... We determined the allelic and linkage relations among genes for stem rust (Puccinia graminis Pers. f. sp. tritici Eriks. & E. Henn.) resistance in wheat lines designated Mq-A, Mq-B, Mq-C, and Rl-B-1, which were derived from crosses of ‘Little Club’ with ‘Marquis’ or ‘Reliance’ wheat (Triticum aestivum L. em Thell.). The four derived lines were crossed with 14 tester lines having genes for resistan ...