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|Title: ||Vegetative propagation of dieback-tolerant Fraxinus excelsior on|
|Authors: ||Douglas, Gerry C.|
|Keywords: ||Ash Dieback|
|Issue Date: ||2017|
|Publisher: ||Swedish University of Agricultural Sciences|
|Citation: ||Douglas GC, McNamara J, O’Connell K, Dunne L, Grant J (2017): Vegetative propagation of dieback-tolerant Fraxinus excelsior on a commercial scale in: “Dieback of European Ash (Fraxinus spp.): Consequences and Guidelines for Sustainable Management” The Report on European Cooperation in Science & Technology (COST) Action FP1 103 FRAXBACK pp. 288-299 Edited by: Vasaitis R. and Enderle R. Publisher: Swedish University of Agricultural Sciences|
|Abstract: ||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 trees, because the
genetic component of inheritance for disease tolerance is high. For mature and juvenile plant material, the
deployment of disease tolerant genotypes could be potentially achieved by vegetatively propagating selected
genotypes. We describe a system to vegetatively propagate selected ash genotypes and we discuss the prospects
and options for using vegetative propagation on all age classes of trees. Mature trees were rejuvenated through
the process of micropropagation to establish mother plants in large trays which were cut back repeatedly
(hedged) to produce at least two crops of cuttings per year.
The rooting capacity of ten genotypes was tested by a commercial nursery over a period of three years, to assess
the feasibility of using hedged mother plants for efficient propagation. Commercial practise was to treat cuttings
with 0.25% IBA, insert them in plug pots and maintain them covered with fine plastic within low plastic tunnels
in a non heated greenhouse and without supplementary heating at the cutting base. In the first year, the mean
rooting rate was 53 % for the first crop of cuttings and 35 % for the second. In the second and third years the
rooting rates improved to over 80% for each crop of cuttings as experience was gained in handling the material.
Rooting rate varied among the genotypes.
We assessed the growth and development of micropropagated ash trees in the field from an observation clonal
trial, consisting of four mature genotypes which had been established in 2002 in five replicate plots. The
micropropagated trees were generally similar in height and dbh to seed derived control trees and developed
normally. These observations are discussed in the context of using vegetative propagation as a tool in breeding
and for the large scale deployment of ash with tolerance to H. fraxineus.|
|Description: ||book chapter|
This publication is based on the work of Action FP1103 FRAXBACK,
supported by COST (European Cooperation in Science and Technology)
|Appears in Collections:||Forestry|
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