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Root associated fungi of conifer seedlings and their role in afforestation of agricultural land

Menkis, Audrius (2005). Root associated fungi of conifer seedlings and their role in afforestation of agricultural land. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2005:106
ISBN 91-576-6905-8
[Doctoral thesis]

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The aim of the present thesis was to study root-related, mycological aspects of afforestation of former agricultural land with conifer seedlings, focusing on mycorrhizal, endophytic and pathogenic fungi, and factors influencing their interactions with roots. Mycorrhizal colonisation of root systems is an important factor in determining seedling vigour, and consequently, survival and growth after their outplanting on agricultural land. Investigations in forest nurseries demonstrated that cultivation systems of Pinus sylvestris and Picea abies seedlings significantly affect the mycorrhizal colonisation of root systems. Bare root cultivation of pine and a containerised polyethylene roll system for spruce provide the most suitable conditions for abundant mycorrhizal colonisation of roots. Artificial inoculation of roots with selected ectomycorrhizal fungi at outplanting was also evaluated as a method to improve establishment of conifer seedlings on agricultural land. The results demonstrated that seedlings inoculated with certain ectomycorrhizal fungi had significantly higher survival and better growth during the first two growing seasons than non-inoculated seedlings. However, these effects appear to be short-lived since, even with relatively costly, labour-intensive inoculation methods, it was difficult to manipulate mycorrhizal communities over time, and their composition was ultimately largely governed by environmental conditions of the planting sites. In other studies, it was also demonstrated that the planting environment determines the fungal communities in decayed conifer seedling roots since different fungi were detected in forest nurseries, afforested clear-cuts and agricultural land. The common occurrence of pathogenic fungi in all planting environments indicated the potential risk of root diseases and consequently the need for accurately assessing plant health before outplanting. The potential for biochemical control of root pathogens was investigated through isolation and characterisation of new antifungal depsipeptides produced by the actinomycete Kutzneria sp. 744. The endophytic nature of the organism indicated a possible application for biological control of root pathogens. Combinations of different sampling strategies and detection methods revealed high diversities of fungi associated with both healthy and decayed roots. Mycorrhizal fungi were predominantly detected in healthy roots and pathogenic fungi predominantly in decayed roots while endophytes showed high ecological plasticity and were common in both healthy and decayed roots of conifer seedlings.

Authors/Creators:Menkis, Audrius
Title:Root associated fungi of conifer seedlings and their role in afforestation of agricultural land
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :October 2005
Number of Pages:31
ALLI. Menkis, A., Vasiliauskas, R., Taylor, A. F. S., Stenlid, J. & Finlay, R. (2005) Fungal communities in mycorrhizal roots of conifer seedlings in forest nurseries under different cultivation systems, assessed by morphotyping, direct sequencing and mycelial isolation. Mycorrhiza. In press. II. Menkis, A., Vasiliauskas, R., Taylor, A. F. S., Stenström, E., Stenlid, J. & Finlay, R. (2005) Fungi in decayed roots of conifer seedlings from forest nurseries, afforested clearcuts and abandoned farmland. Plant Pathology. In press. III. Menkis, A., Vasiliauskas, R., Taylor, A. F. S., Stenlid, J. & Finlay, R. Afforestation of abandoned farmland with conifer seedlings inoculated with three ectomycorrhizal fungi. Submitted manuscript. IV. Menkis, A., Allmer, J., Vasiliauskas, R., Lygis, V., Stenlid, J. & Finlay, R. (2004) Ecology and molecular characterization of dark septate fungi from roots, living stems, coarse and fine woody debris. Mycological Research 108, 965-973. V. Broberg, A., Menkis, A., Vasiliauskas, R. Kutzneride 1 - 4, new depsipeptides from the actinomycete Kutzneria sp. 744 inhabiting mycorrhizal roots of Picea abies seedlings. Submitted manuscript.
Place of Publication:Uppsala
ISBN for printed version:91-576-6905-8
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:H Protection of plants and stored products > H20 Plant diseases
F Plant production > F62 Plant physiology - Growth and development
Subjects:Not in use, please see Agris categories
Agrovoc terms:afforestation, forest nurseries, farmland, pinus sylvestris, picea abies, cropping systems, pathogens, inoculation, mycorrhizae, endophytes
Keywords:afforestation, agricultural land, ectomycorrhiza, endophytes, forest nurseries, inoculation, Pinus sylvestris, Picea abies, root pathogens, seedling cultivation systems.
Permanent URL:
ID Code:955
Department:(S) > Institutionen för skoglig mykologi och patologi
Deposited By: Audrius Menkis
Deposited On:14 Oct 2005 00:00
Metadata Last Modified:02 Dec 2014 10:08

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