Download or read book The Structure and Function of Some Viruses of Gaeumannomyces Graminis Var Tritici written by M. A. Romanos and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studies on the Detection Biology and Control of Gaeumannomyces Graminis Var Tritici written by Monica Elliott Juhnke and published by . This book was released on 1983 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Population Diversity and Fungicide Sensitivity of Gaeumannomyces Graminis Var Graminis from St Augustinegrass in Texas written by Matthew John Zidek and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Gaeumannomyces graminis var. graminis (Ggg) is an ectotrophic root infecting fungus that causes root-decline of warm-season turfgrasses and black sheath rot of rice (Oryza sativa). A total of 76 Ggg isolates were collected from St. Augustinegrass (Stenotaphrum secundatum) throughout Texas. Variations of colony morphology, hyphopodia production, teleomorphic and anamorphic structures, and growth rate of isolates were examined on potato dextrose agar (PDA), and rice seedling pathogenicity assays were performed. A multilocus phylogeny reconstruction was developed to support phenotypic data and to resolve the phylogeny of Ggg. Fungicide sensitivities were also evaluated. Azoxystrobin 50% effective concentration (EC50) values of nine isolates were determined in the presence and absence of salicylhydroxamic acid (SHAM) for determination of alternative respiration. Tebuconazole and azoxystrobin EC50 values from 15 and 20 isolates, respectively, were used to establish single discriminatory concentrations for resistance screening and EC50 determination of remaining isolates. Isolates were also screened for thiophanate-methyl resistance. Three phenotypic groups were found on PDA: (i) highly melanized with round colony formation (termed M group), (ii) non to slightly melanized with round colony formation (termed L group), and (iii) highly melanized with irregular colony formation (termed H group). All isolates produced lobed hyphopodia and a Phialophora-like anamorph, where phialospore lengths were significantly longer among M and H groups compared to the L group. M group isolates were adapted to warmer temperatures compared to L and H group isolates, and groups were differentiated based on growth rates at 35°C. The M group was most aggressive. A multilocus phylogeny reconstruction supported the differentiation between phenotypic groups and distinguished Ggg and G. graminis varieties avenae and tritici. EC50 values from azoxystrobin-amended PDA were significantly lower in the presence of SHAM, indicating utilization of alternative respiration. Azoxystrobin and tebuconazole discriminatory concentrations were 0.1 [micro]g a.i. ml−1 and were effective for rapid EC50 determination. Azoxystrobin EC50 values for 75 isolates ranged from

Download or read book Pathogenic Variation in Gaeumannomyces Graminis written by P. A. Blanch and published by . This book was released on 1977 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Transformation of Gaeumannomyces Graminis Var Tritici with the Green Fluorescent Protein written by M. van Veen and published by . This book was released on 1999 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Genetics and Population Studies of Gaeumannomyces Graminis written by Robert Ian Musker and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Development and Utilization of Assays to Characterize Populations of Gaeumannomyces Graminis written by Samantha Lynn Thomas and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Take-all, caused by Gaeumannomyces graminis, is a devastating root disease on cereal crops and turfgrasses worldwide. Three varieties of the fungus have been described and are distinguished from one another based on hyphopodium type and ascospore length. G. graminis var. avenae (Gga) produces simple hyphopodia and generally longer ascospores as compared with G. graminis var. tritici (Ggt) and var. graminis (Ggg). G. graminis isolates were subjected to morphological, molecular and pathogenicity assays in an effort to determine the most reliable method for differentiating varieties. A host pathogenicity test tube assay was developed to induce the formation of perithecia and ascospores and to determine the pathogenicity of isolates on wheat and oats. Gga isolates were distinguished from Ggt and Ggg based on pathogenicity on oats and the production of amplicons with an avenacinase-specific primer set, Gga:AV3. Ggt and Ggg were not distinguished due to overlaps among all characters. Gga is also the causal agent of take-all on creeping bentgrass. A rapid assay was developed and used to determine the effect of root zone mix composition on take-all incidence of creeping bentgrass. Sand type and organic matter amendment were shown to influence disease incidence. Plants grown in mason sands amended with 20% compost (v/v) had significantly less root disease incidence as compared with all other mixes. Gga is the only variety to produce avenacinase, detoxify avenacin and to infect oats. Avenacin production in creeping bentgrass was determined using fluorimetry, TLC and HPLC. Avenacin was not detected in creeping bentgrass and Ggt isolates were shown to be able to infect creeping bentgrass indicating Gga or Ggt may incite take-all patch. The development of a real-time PCR assay for Gga was unsuccessful due non-specific amplification from other varieties. However, avenacinase sequence information obtained indicated Gga and Ggt are more closely related to each other than to Ggg. Although Ggt does not express avenacinase activity, the aspartic acid residues which are believed to be the active sites of the avenacinase enzyme are conserved within the Ggt avenacinase-like gene sequence.

Download or read book Genetic Diversity Among Populations of the Take all Fungus Gaeumannomyces Graminis written by Paul Harvey and published by . This book was released on 1993* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Transformation of Gaeumannomyces Graminis and the Fate of Transforming DNA written by Alice LaRayne Pilgeram and published by . This book was released on 1991 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigations Into Gaeumannomyces Graminis Var Tritici Infection of Manganese deficient Wheat written by Nigel S. Wilhelm and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effects of Gaeumannomyces Graminis Var Graminis and Cultural and Environmental Effects on the Growth and Development of Dwarf Bermudagrass written by Roy Lee Stanford and published by . This book was released on 2004 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Interactions Between Gaeumannomyces Graminis and Phialophora Radicicola in Relation to Take all Disease of Wheat written by John Bryan Speakman and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Isolation Characterization and Copper Binding of Gaeumannomyces Graminis Var Graminis Melanin Mutants written by Barbara Anne Frederick and published by . This book was released on 1997 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Genetics of Pigmentation and Pathogenicity in Gaeumannomyces Graminis written by Clare Pamela Kelly and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Resistance in Triticum Aestivum to Infection by Gaeumannomyces Graminis Var Tritici written by Lindsay Penrose and published by . This book was released on 1985 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Epidemiology of Gaeumannomyces Graminis Var Tritici on Winter Wheat written by A. R. Werker and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studies on Suppressive Soils in Relation to the Growth of Gaeumannomyces Graminis Var Tritici and Other Root Pathogens of Wheat written by Graham Bert Wildermuth and published by . This book was released on 1977 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: