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Ecology of Daldinia spp. with special emphasis on Daldinia loculata

Johannesson, Hanna (2000). Ecology of Daldinia spp. with special emphasis on Daldinia loculata. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae. Silvestria, 1401-6230 ; 168
ISBN 91-576-6052-2
[Doctoral thesis]

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Abstract

This thesis comprises studies on the xerophytic ascomycete genus Daldinia. By studying ecological, morphological and molecular characters of herbarium specimens, five distinct Daldinia species were identified from northern Europe: D. concentrica, D. fissa, D. grandis, D. loculata and D. petriniae. The last two mentioned have previously been referred to as D. concentrica in the literature. The distinct stromatal host-specificity of the three species: D. concentrica, D. loculata and D. petriniae was studied in an inoculation experiment. The results indicate that the observed substrate-specificity is not a result of enhanced wood-decaying capability in the substrate on which stromata are usually found. Reproducible PCR-based molecular markers were developed for the postfire species D. loculata by using available sequence data of nuclear genes from species closely related to D. loculata. Each marker spans over one or several introns and showed relatively high intraspecific variability. The genetic variation of D. loculata was studied both within and among forest sites. In a local population structure study of D. loculata in burned birches, we found that it can establish endophytically in sound-looking wood of living trees, most probably by sexual ascospores. In birches killed by forest fire, each haploid genet occupied an extensive volume of wood. Multilocus genotyping of vegetative mycelia and offspring of the attached stromata indicated multiple matings of the relatively large vegetative mycelia in wood by several other, very small, genets. The genetic structure of six Fennoscandian and one Kamchatkan D. loculata subpopulation was studied in order to reveal any differentiation on a continental scale. Low levels of genetic differentiation among the Eurasian subpopulations of D. loculata were found, and the differentiation did not increase with distance; the Kamchatkan subpopulation, sampled more than 7000 km from the Fennoscandian subpopulations, was only moderately differentiated from the others. These results suggest that D. loculata consists of a large, coherent Eurasian population of latent mycelia in unburned forests, established by ascospores dispersed from scattered burned forest sites. A tentative life cycle of D. loculata is presente

Authors/Creators:Johannesson, Hanna
Title:Ecology of Daldinia spp. with special emphasis on Daldinia loculata
Year of publishing :January 2000
Volume:168
Number of Pages:43
Papers/manuscripts:
NumberReferences
ALLI. Johannesson, H., Lassge, T. & Stenlid, J. 2000. Molecular and morphological investigation of Daldinia in northern Europe. Mycological Research 104: 275-280. II. Johannesson, H., Ihrmark, K. & Stenlid, J. Differential decay extension capability of Daldinia spp. in wood of Betula pendula, Alnus glutinosa and Fraxinus excelsior. Manuscript. III. Johannesson, H.S., Johannesson, K.H.P. & Stenlid, J. 2000. Development of primer sets to amplify fragments of conserved genes for use in population studies of the fungus Daldinia loculata. Molecular Ecology, 9, 375-377. IV. Johannesson, H., Gustafsson, M. & Stenlid, J. Local population structure of the wood decay ascomycete Daldinia loculata. Mycologia, submitted manuscript. V. Johannesson, H., Vasiliauskas, R., Dahlberg, A., Penttila, R. & Stenlid, J. Genetic differentiation in Eurasian populations of the postfire ascomycete Daldinia loculata. Molecular Ecology, submitted manuscript.
Place of Publication:Uppsala
ISBN for printed version:91-576-6052-2
ISSN:1401-6230
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:H Protection of plants and stored products > H20 Plant diseases
K Forestry > K70 Forest injuries and protection
Subjects:Not in use, please see Agris categories
Agrovoc terms:betula, forests, forest fires, sphaeriales, fungal spores, genetic variation, genetic markers, hosts, ecology, fungal morphology, identification, scandinavia, russian federation
Keywords:Xylariaceae, host-specificity, forest fire, postfire fungi, molecular markers
ID Code:10
Department:(S) > Institutionen för skoglig mykologi och patologi
Deposited By: Staff Epsilon
Deposited On:24 Apr 2002 00:00
Metadata Last Modified:02 Dec 2014 10:01

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