Show simple item record Piercey-Normore, MD 2007-10-10T12:03:08Z 2007-10-10T12:03:08Z 2004-07-31
dc.identifier.citation 0008-4026; CAN J BOT, JUL 2004, vol. 82, no. 7, p.947 to 961. en
dc.description.abstract The lichen-forming fungal genus Cladonia P. Browne associates with green algae in the genus Trebouxia de Puymaly. Genetic structure of the algal symbionts in Cladonia gracilis (L.) Willd., Cladonia multiformis G. Merr., and C. rangiferina (L.) Nyl. was used to infer geographic patterns and symbiont associations. Algal genotypes were defined by restriction fragment length polymorphisms in the nuclear internal transcribed spacer rDNA from 115 samples of Cladonia collected from two geographic regions in Manitoba, Canada. Results suggested that two species of fungal symbiont were highly selective of the algal partner within given geographic areas, and one species was highly selective of the algal partner regardless of the geographic region. Different degrees of selectivity in three species suggested that even within the same genus, fungal selection for the algal partner may vary. In addition, DNA sequences from a subsample of 20 algal and 11 fungal specimens were used to determine phylogenetic relationships of each symbiont. Sequences of four group I intron-like insertions in the small subunit rDNA, two of which were newly reported for the genus Cladonia, were used to infer the fungal phylogeny. The intron phylogenies produced monophyletic species. Sequences of the internal transcribed spacer rDNA were used to infer the algal phylogeny. Cladonia gracilis and C. rangiferina were associated with three species of Trebouxia. en
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dc.format.mimetype application/pdf
dc.language.iso en_US
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dc.subject selectivity en
dc.subject Cladonia en
dc.subject Trebouxia en
dc.subject phylogeny en
dc.subject geographic pattern en
dc.subject GROUP-I INTRONS en
dc.subject SSU RDNA en
dc.subject RIBOSOMAL DNA en
dc.subject TREBOUXIA en
dc.subject PHOTOBIONT en
dc.subject SPECIFICITY en
dc.subject COMMUNITY en
dc.title Selection of algal genotypes by three species of lichen fungi in the genus Cladonia en
dc.status Peer reviewed en

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