Clonal differences in susceptibility to the dieback of Fraxinus excelsior in southern Sweden

  title={Clonal differences in susceptibility to the dieback of Fraxinus excelsior in southern Sweden},
  author={L. G. Stener},
  journal={Scandinavian Journal of Forest Research},
  pages={205 - 216}
  • L. Stener
  • Published 1 April 2013
  • Environmental Science
  • Scandinavian Journal of Forest Research
Abstract Ash dieback damage was assessed and analysed on 16–22 year-old grafts in two ash seed orchards (Fraxinus excelsior L.). The grafts originated from 106 plus-tree clones selected from 27 stands in southern Sweden based on their phenotypes. The results obtained indicate that ash dieback disease is strongly genotypically controlled. There was considerable genotypic variation among individuals. None of the clones seemed to be totally resistant, but some exhibited reduced susceptibility and… 

Genetic analysis of inherited reduced susceptibility of Fraxinus excelsior L. seedlings in Austria to ash dieback

The results thus support the results of other studies, i.e. that highly resistant individuals occur only at low frequency within European ash populations, and support a more complex mechanism of susceptibility differences under natural, heterogeneous conditions.

Individual resistance of Fraxinus angustifolia clones to ash dieback

The presumed resistance of individual ash trees to ash dieback caused by invasive pathogen Hymenoscyphus fraxineus is an important issue for the maintenance of ash in European forests and defence mechanisms such as early leaf flushing, early leaf shedding and the ability to inhibit pathogen growth in host tissues were not confirmed.

Susceptibility of autochthonous German Fraxinus excelsior clones to Hymenoscyphus pseudoalbidus is genetically determined

It is highlighted that there is high genetic variation in susceptibility and considerable genetic potential for resistance breeding in provenances from southwestern Germany.

Genetic variation in dieback resistance in Fraxinus excelsior confirmed by progeny inoculation assay

The correlation between resistance of parent trees and crown damage/necrosis development on their offspring confirms the presence of heritable resistance and indicates that a bioassay based on controlled inoculations has the potential of becoming a fast and cost-effective tool for estimation of dieback susceptibility in breeding programmes for resistance in ash trees.

Genetic analysis of European common ash (Fraxinus excelsior L.) populations affected by ash dieback

The results showed high genetic variation within and high genetic differentiation between ash populations in Bavaria, and a first indication that individuals with a higher heterozygosity might be able to withstand ash dieback in a better way compared to homozygotic individuals.

Genetic variation in dieback resistance: growth and survival of Fraxinus excelsior under the influence of Hymenoscyphus pseudoalbidus

The invasive fungal pathogen, Hymenoscyphus pseudoalbidus V. Queloz, has decimated stands of Fraxinus excelsior L. queloz over most of the species' natural distribution area and confirmed the presence of substantial genetic variation in ash dieback susceptibility.

Mycobiome of Fraxinus excelsior With Different Phenotypic Susceptibility to Ash Dieback

For the last two decades, large-scale population decline of European ash (Fraxinus excelsior) has occurred in Europe because of the introduction of the alien fungal pathogen, Hymenoscyphus fraxineus,

Vegetative propagation of dieback-tolerant Fraxinus excelsior on commercial scale

Ash trees which are tolerant to Hymenoscyphus fraxineus may be selected in all age classes among heavily infected populations. They may be produced also by controlled crossings of disease tolerant

Vegetative propagation of dieback-tolerant Fraxinus excelsior on

A system to vegetatively propagate selected ash genotypes is described and the prospects and options for using vegetative propagation on all age classes of trees are discussed.

Rising out of the ashes: additive genetic variation for susceptibility to Hymenoscyphus fraxineus in Fraxinus excelsior

This study is first to show that Collar Lesions are also heritable and that there is significant genetic correlation between the severities of both traits and that early flushing correlates with better crown status.



Genetic resistance to Hymenoscyphus pseudoalbidus limits fungal growth and symptom occurrence in Fraxinus excelsior

It is suggested that healthier clones are able to limit the growth and spread of the fungus and thereby minimize the occurrence of symptoms, which gives hope for the future preservation of F. excelsior in Europe through selection and breeding.

Presence of natural genetic resistance in Fraxinus excelsior (Oleraceae) to Chalara fraxinea (Ascomycota): an emerging infectious disease

Though this fraction is probably too low to avoid population collapse in most natural or managed ash forests, the observed presence of putative resistance against the emerging infectious disease in natural stands is likely to be of evolutionary importance.

Adaptive potential of ash (Fraxinus excelsior) populations against the novel emerging pathogen Hymenoscyphus pseudoalbidus

The results suggest that the presence of additive genetic diversity in natural F. excelsior populations can confer the species with important ability to recover, but that low resistance within natural European populations is to be expected because of a low frequency of the hypo‐sensitive trees.

Chalara fraxinea is an invasive pathogen in France

This study confirms the results of Queloz et al. (2010) who presented molecular evidences for the existence of two cryptic species, H. albidus and H. pseudoalbidus in France and suggests that Chalara fraxinea/H.

Associations among symptoms of dieback in even-aged stands of ash (Fraxinus excelsior L.)

The analysis suggested that the observed symptoms of crown dieback are caused by a primary disease, and the development of phytosanitary prescriptions for silviculture should primarily be targeted towards young stands as these represent the most critical phases of stand development.

Fungi associated with necrotic apical parts of Fraxinus excelsior shoots

Summary Stem necrosis was investigated in 2–3-year-old seedlings of European ash Fraxinus excelsior, both self-sown and in plantations within four Forest Divisions in eastern, northern and central

Cryptic speciation in Hymenoscyphus albidus

Molecular evidence is presented for the existence of two morphologically very similar taxa, H. albidus, which is lectotypified and Hymenoscyphus pseudoalbidus sp.

Occurrence and pathogenicity of fungi in necrotic and non-symptomatic shoots of declining common ash (Fraxinus excelsior) in Sweden

Thirty-four isolates from 24 fungal taxa were used for artificial inoculations of 277 1-year-old F. excelsior seedlings in bare root nursery, and moderate to high similarity of fungal communities was observed in shoots despite the symptoms.

Investigations concerning the role of Chalara fraxinea in declining Fraxinus excelsior

The role of the fungus Chalara fraxinea in decline of Fraxinus excelsior, which is observed on a large scale in central and northern Europe with high incidence of tree mortality, is clarified and fungal communities inhabiting tissues with symptoms are studied.

Badania nad zamieraniem jesionu (Fraxinus excelsior L.) w drzewostanach Nadleśnictwa Włoszczowa [The studies on ash dying (Fraxinus excelsior L.) in the Włoszczowa Forest Unit stands]

Most of the types of disease symptoms appeared irrespectively of the tree age, origin and site, sometimes showing only a difference in the frequency of occurrence and on the seedlings in the nursery the shoot discolouration, healed and unhealed cankers on shoots and necrosis of a part of leaves were recorded most frequently.