Results 121 to 130 of about 658 (163)
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Contrasting structure of European and North American populations of Ophiostoma ulmi
Mycological Research, 1994The structures of European and North American populations of Ophiostoma ulmi , responsible for the first pandemic of Dutch elm disease, were compared by assessing the diversity of vegetative compatibility (vc) types and sexual mating types. All six European samples examined were highly diverse for vc-types whether the samples were continental ...
A.G. Mitchell, C.M. Brasier
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Characterization of Isolates of Ophiostoma ulmi by Molecular Techniques
1993Ophiostoma ulmi (Buism.) Nannf. is the casual agent of Dutch elm disease. In nature, the pathogen exists as three distinct subpopulations: the weakly pathogenic nonaggressive subgroup and the highly pathogenic aggressive subgroup, which itself divides into two races, the Eurasian (EAN) and North American (NAN) races.
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Effect of MBC fungicide tolerance on the fitness of Ophiostoma ulmi
Plant Pathology, 1988Isolates of Ophiostoma ulmi with mutations conferring high or low levels of tolerance to MBC‐generating fungicides were selected in the laboratory. Comparisons between these tolerant forms and their wild type equivalents indicated that the acquisition of a mutation in the ...
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Regulated gene silencing in the fungal pathogen Ophiostoma novo-ulmi
Physiological and Molecular Plant Pathology, 2013Abstract Ophiostoma novo-ulmi is the third most devastating fungal pathogen in Canada, affecting native Ulmus spp. Control efforts are pursuing a gene regulation approach, using RNAi cassettes driven by constitutive heterologous promoters to evaluate virulence-related genes. A homologous carbon-catabolite regulated promoter (alcA) was developed for a
Joyce S. Carneiro +2 more
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Transmission of double‐stranded RNA and a disease factor in Ophiostoma ulmi
Plant Pathology, 1986A diseased isolate of Ophiostoma ulmi was found to contain 10 segments of double‐stranded RNA (dsRNA) with molecular weights ranging from 2.40 x 10 6 to 0.23 x 10 6 .
H J ROGERS, K W BUCK, C. M. BRASIER
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Mycological Research, 1996
Extracellular laccase production of the Dutch elm disease pathogens Ophiostoma ulmi and O. novo-ulmi was monitored during growth in vitro. Under conditions conducive to mycelial growth, O. novo-ulmi secreted appreciable amounts of laccase (0·26 ± 0·06 U ml−1) in parallel with growth whereas laccase activity in O. ulmi was barely detectable (⩽ 0·02 U ml−
Thomas Binz, Giorgio Canevascini
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Extracellular laccase production of the Dutch elm disease pathogens Ophiostoma ulmi and O. novo-ulmi was monitored during growth in vitro. Under conditions conducive to mycelial growth, O. novo-ulmi secreted appreciable amounts of laccase (0·26 ± 0·06 U ml−1) in parallel with growth whereas laccase activity in O. ulmi was barely detectable (⩽ 0·02 U ml−
Thomas Binz, Giorgio Canevascini
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Cellulolytic activity and virulence of Ophiostoma ulmi and O. novo‐ulmi isolates
Forest Pathology, 2006SummaryThe cellulolytic activity (exoglucanase, endoglucanase and β‐glucosidase) of Ophiostoma ulmi (four isolates), O. novo‐ulmi (19 isolates) and ‘fast‐waxy’ (five isolates) was determined in growth media containing carboxymethylcellulose (CMC) and cellulose powder.
K. Przybył +3 more
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In vitro analysis of the interaction between elm and Ophiostoma ulmi or O. novo-ulmi
1996The growth of Ophiostoma ulmi and O. novo-ulmi EAN and NAN races on callus cultures from Ulmus carpinifolia and U. pumila at 21, 25 and 33 °C were investigated and compared with the degree of compatibility of in vivo fungus-whole plant interactions and with fungal growth rates on a range of agar media at 21, 25 and 33 °C.
SCALA, ANIELLO +6 more
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Meiotic analysis of induced mutations in Ophiostoma ulmi
Canadian Journal of Botany, 1990Laboratory strains of Ophiostoma ulmi carrying nuclear mutations induced by exposure to N-methyl-N′-nitro-N-nitrosoguanidine were crossed, and the segregation of genetic markers was analyzed in random ascospore progeny. Investigation of 13 auxotrophic mutations and 1 benomyl-resistant mutation provided evidence for at least three linkage groups in O ...
L. Bernier, M. Hubbes
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1993
Since the early 1970s there has been considerable progress in our understanding of Dutch elm disease biology, from beetle feeding preferences to the efficiency of vector transmission, and from the role of fungal toxins to elm resistance mechanisms. Included in this progress is discovery that there have been not one but two pandemics of the disease in ...
C. M. Brasier +3 more
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Since the early 1970s there has been considerable progress in our understanding of Dutch elm disease biology, from beetle feeding preferences to the efficiency of vector transmission, and from the role of fungal toxins to elm resistance mechanisms. Included in this progress is discovery that there have been not one but two pandemics of the disease in ...
C. M. Brasier +3 more
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