Intraspecific comparisons of Laetiporus sulphureus isolates from broadleaf and coniferous trees in Europe

Laetiporus sulphureus causes heart-rot in deciduous trees and conifers. European isolates were examined using nuclear DNA markers as well as somatic and sexual compatibility. Pairing tests for somatic compatibility with isolates from 20 different host individuals revealed that each tree is normally...

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Bibliographic Details
Published in:Mycological research 1999-10, Vol.103 (10), p.1245-1251
Main Authors: ROGERS, SCOTT O., HOLDENRIEDER, OTTMAR, SIEBER, THOMAS N.
Format: Article
Language:English
Subjects:
Basidiomycota
basidiospores
Biological and medical sciences
colonization
compatibility
conidia
decay fungi
Fundamental and applied biological sciences. Psychology
Fungal plant pathogens
genbank/af068922
genbank/af068923
genbank/af068924
genbank/af068925
genbank/af068926
genbank/af068927
genbank/af068928
genetic markers
genotype
host plants
host range
hyphae
Laetiporus sulphureus
molecular sequence data
nucleotide sequences
phylogeny
Phytopathology. Animal pests. Plant and forest protection
plant diseases and disorders
ribosomal DNA
sexual reproduction
spore germination
Systematics. Morphology. Development cycle. Physiology
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Summary:Laetiporus sulphureus causes heart-rot in deciduous trees and conifers. European isolates were examined using nuclear DNA markers as well as somatic and sexual compatibility. Pairing tests for somatic compatibility with isolates from 20 different host individuals revealed that each tree is normally colonized by a different genet. The hyphae are multinucleate, basidiospores are binucleate, and conidia contain 2–6 nuclei. Basidiospore germination was erratic, and no clear mating pattern was observed. In one case all single spore isolates from the same basidioma were compatible with each other. Single spore isolates from coniferous and from broadleaf trees were incompatible. The nuclear ribosomal DNA ITS regions from six isolates of different origin revealed nucleotide distances of up to 14·6%. Phylogenetic analysis resulted in a single clade for all isolates. Within this clade, a subclade including only the isolates from gymnosperm hosts was present, indicating that these isolates were derived from ancestral lines from broadleaf hosts. While there is evidence that more than one species or ecotype is represented within the current definition of L. sulphureus, circumscription of additional taxa, and separations within this taxon, remain unclear.
ISSN:0953-7562
1469-8102
DOI:10.1017/S0953756299008564