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Erwinia amylovora is a polyphagous bacterium causing fire blight on apple, pear and over 130 other plant species belonging mainly to the Rosaceae family. Although E. amylovora is regarded as a very homogenous species, the particular strains can differ in pathogenic ability as far as their host range is concerned (e.g. those originating from Rubus or Maloidae plants) as well as by the extent of the...
Hydrogen peroxide plays a critical role in the expression of disease resistance in several plant/pathogen interactions. It serves as a substrate for oxidative cross-linking of various plant cell wall components leading to the reinforcement of the cell structure, as a direct toxin against the pathogen and as a signal molecule for the induction of defence-related genes in the adjacent, still healthy...
Several analytical techniques such as gas chromatography–mass spectrometry, proton transfer reaction–mass spectrometry and laser photoacoustic detection, were used to characterize the volatiles emitted by Erwinia amylovora and other plant-pathogenic bacteria. Diverse volatiles were found to be emitted by the different bacterial species examined. The distinct blend of volatiles produced by bacteria...
Erwinia amylovora, the causative agent of fire blight, colonizes primarily the flowers of the sub-family Maloideae. Commercially important fruit tree species such as apple (Malus domestica) and pear (Pyrus communis) are also affected by the disease. Epiphytic bacterial populations develop on the stigma, from where the pathogen colonizes the hypanthium, aided by moisture. Under favorable conditions,...
Several old cultivars, and breeding clones of European pear Pyrus communis L. originating from Belgium, England, Sweden, and Switzerland were evaluated for their resistance/susceptibility to fire blight. Studies were carried out during three consecutive years 2007–2009 in the greenhouse of Warsaw University of Life Sciences, Poland. Strain 691 of Erwinia amylovora was used for artificial infection...
Fire blight (Erwinia amylovora) causes serious damage to pome fruit orchards, and identification of germplasm with heritable disease resistance is therefore crucial. Two dominant SCAR (sequence characterised amplified region) marker alleles (AE10-375 and GE-8019), flanking a previously identified QTL (quantitative trait locus) for resistance to fire blight on ‘Fiesta’ linkage group 7 in apple cultivars...
Fire blight, a devastating disease of pome fruit trees continues to pose threat to agricultural production. Detection of its causative agent, bacterium Erwinia amylovora, is usually straightforward in symptomatic samples. Methods with increased sensitivity however, are sometimes needed for detection of E. amylovora and real-time PCR assays have been shown to have required sensitivity and reliability...
Acylcyclohexanediones and antagonistic bacteria sprayed alone or in combination have been shown to suppress fire blight of apple and pear. Acylcyclohexanediones, such as prohexadione-calcium and trinexapac-ethyl, increase plant resistance and are effective against the shoot blight phase of the disease. Antagonistic bacteria, such as Pantoea agglomerans, compete with the pathogen (Erwinia amylovora...
Biosynthesis of phytoalexins is a plant defence strategy against pathogens. Shoots of the apple (Malus × domestica) cultivar ‘Holsteiner Cox’ formed biphenyls and dibenzofurans when inoculated with the fire blight bacterium, Erwinia amylovora. The phytoalexins were only present in the transition zone of stems, whereas the leaves were devoid of the defence compounds. The scaffold of the phytoalexins...
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