نتایج جستجو برای: ustilago zeae
تعداد نتایج: 1530 فیلتر نتایج به سال:
The host range of the corn cyst nematode, Heterodera zeae, recently detected in Maryland, was investigated. A total of 269 plant entries, representing 68 families, 172 genera, and 204 species, was inoculated with cysts or a mixture of eggs and second-stage juveniles of H. zeae. The host range of the Maryland population of H. zeae was limited to plants of the Gramineae and included 11 tribes, 33...
In 2010, disease symptoms, including necrotic lesions on stems and leaves with circular yellow-brown or irregular brown color patches, were observed on cool-season turfgrass at golf courses (OHCC) and the Daegu University research farm in Gyeongbuk, Korea. We isolated the causal agent and identified it as Waitea circinata var. zeae by morphological characterization and molecular analysis. To th...
Ustilago maydis was transformed by plasmids bearing a cloned, selectable gene but lacking an autonomously replicating sequence. Transformation was primarily through integration at nonhomologous loci when the plasmid DNA was circular. When the DNA was made linear by cleavage within the cloned gene, the spectrum of integration events shifted from random to targeted recombination at the resident c...
In the plant pathogenic fungus Ustilago maydis, sexual and pathogenic development are controlled by the multiallelic b mating-type locus. The b locus encodes a pair of unrelated homeodomain proteins termed bE and bW, with allelic differences clustering in the N-terminal domains of both polypeptides. Only combinations of bE and bW of different allelic origin are active. We have investigated the ...
A series of N-(substituted pyridinyl)-1-methyl(phenyl)-3-trifluoromethyl-1H-pyrazole-4-carboxamide derivatives were synthesized. All target compounds were characterized by spectral data (¹H-NMR, ¹³C-NMR, IR, MS) and elemental analysis and were bioassayed in vitro against three kinds of phytopathogenic fungi (Gibberella zeae, Fusarium oxysporum, Cytospora mandshurica). The results showed that so...
Leaf and sheath spot (mini ring) is a turfgrass fungal disease that has been reported in some states the USA. The causal pathogen Waitea circinata var. zeae, also known as Rhizoctonia zeae. This typically causes thinned turf areas and/or rings of full, half, or quarter circles. Turfgrass under stress irrigated with high salinity water more prone to infestation. Seven fungicide programs were eva...
روند توسعه بیماری قارچ عامل بیماری سیاهک معمولی ذرت ustilago maydis، با میکروسکوپهای نوری و الکترونی بررسی شد. بدین منظور از رقمهای سینگلکراس 301، 647 و دابلکراس704 که پیشتر به ترتیب به عنوان رقمهای حساس، نیمه مقاوم و مقام به این بیماری ذکر شده بود، استفاده شد. مایه قارچ از کشت تلیوسپورهای جمعآوری شده از استان خوزستان در محیطهای cma و pda + 10% دکستروز و نگه داری در دمای c º25 به مدت 5 ر...
The mammalian-type cytochrome c of the basidiomycete Ustilago sphaerogena contains in a single polypeptide chain of 107 residues, two histidine residues located at positions 18 and 33, and one methionine residue situated at position 80 (Bitar et al., 1972). The reaction of Ustilago ferricytochrome c with bromoacetate at neutral pH resulted in the modification of histidine-33, but not of histidi...
A decade of losses and damage due to fusarium head blight in cereals in North America and other parts of the world has resulted in great efforts to understand the factors that cause and intensify the disease. This review considers our current understanding of the importance of the contribution of cultural practices to the increase or decrease of inoculum levels, spore dispersal, and biological ...
Isolates of Cercospora species from leaves displaying symptoms of grey leaf spot were collected in maize-producing areas of south-central Brazil in 2001 and 2002. Restriction digests of the internal transcribed spacer region of rDNA detected the presence of the same two Cercospora species described on maize in the United States, namely C. zeae-maydis and the recently described species, C. zeina...
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