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RAPDs distinguish the lichens Xanthoria aureola and X. parietina in a mixed seashore rock population

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Morphological characters can vary to an extent that makes it difficult to separate the two morphologically and chemically similar species Xanthoria aureolaand X. parietina for an inexperienced field biologist. They occur frequently in mixed stands on seashore rocks on the western coast of Norway. We examined (1) whether a simple method like RAPD-PCR could confirm the distinction between the two species previously reported on the basis of DNA sequences, and (2) whether infraspecific DNA and RAPD data from X. parietina were congruent. We also checked whether the RAPD band scoring procedure could affect the results. Results show that (1) RAPD distance matrices based on band scorings performed independently by the two authors were always congruent and differences never affected conclusions, (2) RAPD clearly distinguishes between X. parietina and X. aureola in a way that is fully congruent with a classification based on DNA sequence data, and (3) there was no significant congruence between infraspecific distances based on DNA sequences and RAPD data in X. parietina. The latter observation may be taken as support for a previously published report of low levels of recombination in X. parietina, which stands in contrast to statements of obligate homothallism in that species.
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Keywords: LICHEN-FORMING ASCOMYCETES; RAPD-PCR; TELOSCHISTACEAE; XANTHORIA

Document Type: Research Article

Publication date: May 1, 2012

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  • Nova Hedwigia is an international journal publishing original, peer-reviewed papers on current issues of taxonomy, morphology, ultrastructure and ecology of all groups of cryptogamic plants, including cyanophytes/cyanobacteria and fungi. The half-tone plates in Nova Hedwigia are known for their high quality, which makes them especially suitable for the reproduction of photomicrographs and scanning and transmission electron micrographs.
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