Download or read book Variability in the Infection of Wheat by Puccinia Graminis Tritici written by Mary Ann Swaebly and published by . This book was released on 1955 with total page 230 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 Variability in Resistance of Certain Wheat Varieties to Puccinia Graminis Tritici Race 15 written by Tapa Nath Shukla and published by . This book was released on 1952 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies on Phenotypic Variability Within Puccinia Graminis Var Tritici written by James Dale Miller and published by . This book was released on 1971 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Variability in Reaction of Wheats to Isolates of Faces 38 and 48 of Puccinia Graminis Var Tritici written by Juan Orjuela-Navarrete and published by . This book was released on 1957 with total page 226 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 The Wintering of Puccinia Graminis Tritici E H and the Infection of Wheat Thru the Seed written by Frederick John Pritchard and published by . This book was released on 1911 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Influence of Environment and Pathogen Variability on the Infection of Wheat by Puccinia Striiformis West written by Richard Gary Beaver and published by . This book was released on 1972 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Race identification of stripe rust (Puccinia striiformis West.) is influenced by environment, pathogen variability and host age. Isolates of stripe rust were collected in the Pacific Northwest and characterized on two sets of differential varieties; the "Oregon" and the United States. Six of the seven isolates tested on the seedling Oregon differentials were identified as separate races at the 2 C/18 C (night /day) temperature profile; however, seven races could be identified using mature plants. Eight of the 16 Oregon differentials used as seedlings gave similar infection types as mature plants with all seven isolates tested. The remaining eight varieties changed from a susceptible seedling reaction to a more resistant reaction as a mature plant with specific host-pathogen combinations. This change can be used to separate the seven isolates into races. Only the variety Leda was consistently more resistant as a mature plant than as a seedling. This "mature plant resistance" is contrasted to the "field resistance" of the variety Gaines which is conditioned by environment. Five of the eight isolates tested on the United States differential varieties could be identified as separate races. With the aid of the eight supplemental varieties all eight isolates could be separated. Six field races of stripe rust could be identified on wheat grown at 11 sites in Oregon using the Oregon field differential varieties. These varieties also indicated a shift in the make-up of the rust race populations during the last four years in the Willamette Valley. Similarities in field race characteristics at Pendleton, in eastern Oregon, and Aurora, in the Willamette Valley, were also noted. Percentage of germination and penetration of uredospores of stripe rust differed on 15 Oregon differential varieties. An unidentified factor inhibited uredospore germination on certain varieties. Penetration of stomates was also delayed on some varieties but no consistent correlation could be made with inhibition of germination or host resistance to stripe rust. Desiccation following short dew periods of three or four hours effectively reduced the amount of viable inoculum available during a 24-hour period. Inoculum removal by desiccation can be made more effective by the use of varieties that lengthen the interval from uredospore germination to penetration. Under field conditions, inoculum removal can reduce final disease severity. For example, with an apparent infection rate of 0.0146 per unit per day for stripe rust, removal of inoculum from death of germinating spores for a five day period would reduce the final disease severity by 14.7 percent over a 40-day period. Factors limiting fall spread of stripe rust in the Willamette Valley differ from those in eastern Oregon. In the Willamette Valley spore movement is by leaf to leaf contact during the wet winter months. In eastern Oregon little or no rust movement occurs until warm spring weather facilitates aerial spore movement. During most years sporulating leaves are killed by freezing winter weather and rust survival is limited to infected, non-sporulating green host tissue. Competition for infection and sporulation sites between an albino race of stripe rust and four yellow races was noted. Some mechanism inherent to the albino race and presumably other races prevents invasion and/or sporulation within previously colonized host tissue. Competition between two races of stripe rust can reduce the potential number of sites for infection on a wheat leaf by 99 percent. In addition, competition can change the ratio of one race to another in the population from 1:1 to 3:1 in one generation. Summer survival on grasses in mountain areas of Oregon is limited and does not appear to play an important role in oversummering of stripe rust in Oregon. Field race(s) of stripe rust found at the Mountain Plots appears similar to race(s) in wheat growing areas. Movement of inoculum from mountain areas to wheat fields in the fall of the year seems unlikely since rust on wheat and grasses inoculated in June could not be found the following September.
Download or read book The Cereal Rusts Origins specificity structure and physiology written by William Rodgers Bushnell and published by . This book was released on 1984 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: Origins, specificity, structure, and physiology; Evolution at the center of origin; Taxonomy of the cereal rust fungi; Specificity; The formae speciales; Race specificity and methods of study; Genetics of the pathogen: host association; Histology and molecular biology of host: parasite; Virulence frequency dynamics of cereal rust fungi; The rust fungus; Controlled infection by Puccinia graminis f.sp. tritici under artificial conditions; Developmental ultrastructure of hyphae and spores; Development and physical of teliospores; Obligate parasitism and axenic culture; The host parsite interface; The rusted host; Effects of rust on plant development in relation to the translocation of inorganic and organic solutes.
Download or read book Rust Diseases of Wheat written by Alan P. Roelfs and published by CIMMYT. This book was released on 1992 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wheat Rust Diseases written by Sambasivam Periyannan and published by Humana. This book was released on 2018-06-12 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents a collection of tools currently used for the characterization of rust, the host plant wheat, and their interactions. This book is divided into five parts: Parts I and II discuss advanced techniques for characterizing rust pathogens in rust surveillance, genotyping, and molecular pathogenicity; Part III describes protocols for genetic analysis of rust resistance; Part IV covers methods on rust resistance gene cloning; and Part V talks about the isolation and screening of bacterial endophytes as biocontrol agents for rust disease management. Written in the highly successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls. Cutting-edge and authoritative, Wheat Rust Disease: Methods and Protocols is a valuable resource for both established and novel wheat rust researchers and also the plant science and microbial research community.
Download or read book Breeding Strategies for Resistance to the Rusts of Wheat written by International Maize and Wheat Improvement Center and published by CIMMYT. This book was released on 1988 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stem Rust of Wheat written by Paul David Peterson and published by American Phytopathological Society. This book was released on 2001 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wheat rust diseases have been among the most devastating of all plant diseases since biblical times. Now that nearly a half century has passed without a significant outbreak in the world's major wheat- producing regions, forward writer Nobel laureate Norman Borlaug cautions against complacency. Four contributed chapters examine how the science of plant pathology has responded to such challenges as stem rust of wheat epidemics in the North American Great Plains in the first half of the 20th century, and common barberry as an insidious spreader of black stem rust. Includes photos of plant pathologists and their research in the field (literally). c. Book News Inc.
Download or read book Evolutionary Dynamics of Plant Pathogen Interactions written by Jeremy J. Burdon and published by Cambridge University Press. This book was released on 2019-01-31 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: A broad view of plant-pathogen interactions illustrating the fundamental reciprocal role pathogens and hosts play in shaping each other's ecology and evolution.
Download or read book Wheat Rusts written by RA McIntosh and published by CSIRO PUBLISHING. This book was released on 1995-01-01 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although stem rust has been controlled by means of resistant cultivars, leaf and stripe rust continue as problems for many growing areas of the world. Wheat Rusts: An Atlas of Resistance Genes has been prepared by specialists from one of the leading international laboratories, and illustrates with colour photographs typical resistance phenotypes associated with most known genes for resistance to the three rust diseases of wheat. Relevant details for each gene include chromosome location, aspects of genetics and pathogen variation, the effects of environment on expression, origin, availability in genetic and breeding stocks, and use in agriculture. This atlas includes an introduction to host:pathogen genetics, methodologies for wheat rust research and breeding for resistance.
Download or read book Durability of Disease Resistance written by Th. Jacobs and published by Springer Science & Business Media. This book was released on 2012-02-02 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: From February 24 -28, 1992 an international symposium on Durability of Disease Resistance was held at the International Agricultural Centre in Wageningen, the Netherlands. The symposium, organized by the Department of Plant Breeding of Wageningen Agricultural University and the Centre for Plant Breeding and Repro duction Research, CPRO-DLO, was part of the DGIS funded programme Durable Resistance in Developing Countries. Without any form of prevention or protection nearly all crops will be seriously or even severely damaged by a range of pathogens. In modern agriculture man has been able to control many if not most pathogens using i) pesticides, ii) phyto sanitary methods such as control of seed and plant material in order to start a crop disease free, iii) agronomic measures such as crop rotation, iv) disease resis tance or combinations of these measures. Over the years the use of pesticides has increased enormously and so did the pro blems associated with pesticide use, such as environmental pollution and building of resistance and tolerance to these pesticides in the pathogens. The use of resis tance too increased strongly over the years and here too problems arose.
