Download or read book Races and Biotypes of Puccinia Graminis Tritici Eriks and Henn in Relation to Spring Wheat Improvement written by Eugene Benton Hayden and published by . This book was released on 1954 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Progressive Development of Infection by Puccinia Graminis Var Tritici Eriks and E Henn Guyot on Certain Varieties of Wheat and the Relation of Stem Rust to Yield written by Eugene Benton Hayden and published by . This book was released on 1956 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aggressiveness and Pathogenicity of Certain Physiologic Races of Puccinia Graminis Tritici Erikss and Henn written by George Constantine Papavizas and published by . This book was released on 1953 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic mapping of resistance to race Ug99 of Puccinia graminis f sp tritici diversity analysis and identification of stem rust resistance genes in Ethiopian tetraploid wheats written by Jemanesh Kifetew Haile and published by Cuvillier Verlag. This book was released on 2013-01-15 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ethiopia is the second largest wheat producer in the sub-Saharan Africa. The country is rich in genetic resources of tetraploid wheat and has suitable environments for wheat production. However, the country is a net importer of wheat particularly durum wheat (hard wheat). The demand for durum wheat is continuously increasing because of the new emerging food processing industries. But the productivity of wheat in Ethiopia is low due to biotic and abiotic stresses. Among the biotic factors, diseases particularly stem rust play a significant role in yield reduction. As a result of a recent spread of a new and highly virulent race of Puccinia graminis f. sp. tritici (Pgt), Ug99, stem rust is becoming a serious threat to wheat production in Ethiopia as well as in other East African and wheat producing countries. Therefore, it is important to identify new resistance sources and to apply marker assisted selection for sustainable and efficient control stem rust. The aims of the studies included in this thesis were (i) identification of QTL and test for epistatic effects in a segregating population for resistance to stem rust, (ii) identification of stem rust resistance (Sr) genes that are present in durum wheat (Triticum durum Desf.) varieties that were released in Ethiopia during the period 1966–2009 and tetraploid wheat landraces using linked/diagnostic molecular markers and (iii) Evaluation of genetic diversity and relationship pattern within and among these tetraploid wheat landraces and improved varieties based on SSR/STS markers including those linked with reported stem rust resistance genes and QTL. Across all the three experiments, our study demonstrates that there exist potential germplasm and strategies to combat the threat posed by Ug99 and its derivatives. These results provide useful information to wheat breeders in Ethiopia and other national and international programs, regarding the use of available landraces and released varieties for the enhancement of the genetic base of wheat germplsm. Particularly it will give an alarm for Ethiopian wheat breeders to broaden the genetic base of the varieties that will be released in the future since most of the varieties released for the last five decades have a narrow genetic base. In addition, our research provides a base of knowledge for future QTL and gene mapping conferring resistance to stem rust and the use of the linked markers in marker assisted selection.
Download or read book Variability in the Pathogenicity of Races 49 and 139 of Puccinia Graminis Tritici Erikss and Henn written by Hosni Abdel Rahman Mohamed and published by . This book was released on 1955 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Statistical Studies on the Variation of Biologic Forms of Puccinia Graminis Tritici and the Effect of Ecological Factors on the Susceptibility of Wheat Varieties written by Moses Naphtali Levine and published by . This book was released on 1924 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physiologic Races of Puccinia Recondita F Sp Tritici in the United States from 1926 Through 1960 written by Charles Otis Johnston and published by . This book was released on 1968 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physiologic Specialization of Puccinia Graminis Tritici Erikss and Henn in Relation to the Development of Epidemics of Stem Rust on Wheat written by Lee Hines and published by . This book was released on 1930 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Morphological and Physiological Studies on the Resistance of Wheat to Puccinia Graminis Tritici Erikss and Henn written by Charles Raymond Hursh and published by . This book was released on 1923 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biotypes Within Race 15B of Puccinia Graminis Tritici written by Rosendo Postigo-Mendivil and published by . This book was released on 1952 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetics of Seedling Resistance to Stem Rust Puccinia Graminis of Sp tritici Pers Eriks and Henn in Wheat Desf written by R. Thakur and published by . This book was released on 1991 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic and virulence diversity of Puccinia graminis f sp Tritici populations in Ethiopia and stem rust resistance genes in wheat written by Belayneh Admassu Yimer and published by Cuvillier Verlag. This book was released on 2010-03-23 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: As a result of a recent spread of a new and highly virulent race of Puccinia graminis f. sp. tritici called Ug99, stem rust is becoming a serious threat to wheat production in Ethiopia and other east African countries. Therefore, there is an urgent need to analyse the virulence spectrum of Pgt populations in Ethiopia. Wheat stem rust samples were collected in 2006 and 2007 in Arsi, Bale, Shewa and the Northwest regions of Ethiopia to determine the virulence diversity and race distribution in P. graminis f. sp. tritici populations. Stem rust incidence was high in Arsi, Bale and East Shewa. In Northwest Ethiopia, and North and West Shewa, stem rust was prevalent at low levels. A total of 152 isolates was analyzed and 22 races were identified. Races TTKSR (Ug99), TTHSR and RRTTR were predominant with frequencies of 26.6, 17.7 and 11.1%, respectively. These races were also detected in all regions. It turned out that the highly virulent race designated as Ug99 was present throughout the country and dominated in all regions except Northwest Ethiopia. A variant of Ug99, which is virulent against Sr24 was not detected in this study. Four stem rust resistance genes (Sr13, Sr30, Sr36 and SrTmp) were found to confer resistance to most of the races prevalent in Ethiopia. With the exception of Sr30, which is not effective to Ug99, the other three genes can be used in breeding for resistance to stem rust in Ethiopia.
Download or read book Graduate Students and Theses of the Department of Plant Pathology 1905 to 1995 University of Minnesota written by and published by . This book was released on 1996 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies on the Nature of Resistance of Plants to Disease written by Dalton Ta Tung Wang and published by . This book was released on 1957 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Differential Reaction of Strains Within a Variety of Wheat to Physiologic Forms of Puccinia Graminis Tritici written by Theodore Alexander Kiesselbach and published by . This book was released on 1926 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Morphology and Behavior of Certain Races of Puccinia Graminis Tritici Erikss and Henn written by Tewfik Mohamed Abdel-Hak and published by . This book was released on 1948 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Prevalence and Distribution of Physiologic Races of Puccinia Graminis Tritici in the United States from 1938 to 1947 as Affected by the Distribution of Wheat Varieties written by William Quenn Loegering and published by . This book was released on 1949 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
