The paper reviews information on ash dieback, a serious disease of common ash
and its causing agent ash dieback fungus Hymenoscyphus fraxineus. This paper
covers biology and genetics of the causing agent. Main emphasis is given to
the genetic predisposition of the tolerance to the disease. Strong genetic
control of the infection-tolerance opens the possibility for selection of
hyposensitive trees for the establishment of seed orchards, which will
produce offspring with improved tolerance to H. fraxineus.
Papić S., Buriánek V., Longauer R., Kudláček T., Rozsypálek J. (2018) The study was carried out in the experiment with 16 provenances of common ash (Fraxinus excelsior Linnaeus) and 2 provenances of narrow-leaved ash (Fraxinus angustifolia Vahl) at a series of 5 parallel trial plots established in a gradient from lowland riverine to upland ravine sites. The role of the site, ash species and the provenance of common ash proved to have significant effects on the intensity of ash dieback (ADB) associated with the infection by Hymenoscyphus fraxineus (T. Kowalski) Baral, Queloz & Hosoya at the age of 20 years. Narrow-leaved ash was healthier, surviving and growing better than common ash on the trials situated inside as well as beyond its natural range. The ADB intensity was lower in the medium altitude and more easterly located trial plots with a more continental climate. The provenance of forest reproductive material proved to have a significant effect on the ADB damage and survival rate as well as the growth of ash across the trial plots of the experiment.
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