Diversity of the lichenized fungi in King George Island, Antarctica, revealed by phylogenetic analysis of partial large subunit rDNA sequences.
Lichens are predominant and important components of flora in the terrestrial ecosystem of Antarctica. However, relatively few researches on the phylogenetic position of Antarctic lichen-forming fungi have been accomplished. In this study, partial sequences of nuclear large subunit rDNAs from 50 Antarctic specimens were obtained and the phylogeny was reconstructed. Antarctic lichen species were distributed among 4 orders, including the monophyletic order Agyrales, paraphyletic orders Pertusariales and Teloschistales, and polyphyletic order Lecanorales. Species diversity was highest in the order Lecanorales, followed by Teloschistales and Pertusariales. Based on the phylogeny and sequence similarity analyses, it is proposed that the taxonomy of Stereocaulon alpinum, Physcia caesia, Usnea aurantiacoatra, and Cladonia species should be revised by careful examination of their phenotypic and molecular characteristics. Six species known to be endemic to Antarctica, Catillaria corymbosa, Himantormia lugubris, Leptogium puberulum, Pertusaria pertusa, Rhizoplaca aspidophora, and Umbilicaria antarctica, formed unique lineages, implying independent origins in the Antarctic area.
Lee
Jin Sung
JS
Polar Bio-Center, Korea Polar Research Institute, KORDI, 7-50 Songdo-dong, Incheon, Korea.
Lee
Hong Kum
HK
Hur
Jae-Seoun
JS
Andreev
Mikhail
M
Hong
Soon Gyu
SG
D000864:Antarctic Regions; D044822:Biodiversity; D004271:DNA, Fungal / Q000235:genetics; D004275:DNA, Ribosomal / Q000235:genetics*; D005658:Fungi / Q000145:classification / Q000235:genetics*; D005800:Genes, Fungal; D008011:Lichens / Q000145:classification / Q000235:genetics*; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D054683:Ribosome Subunits, Large, Eukaryotic / Q000235:genetics; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA
D004271:DNA, Fungal; D004275:DNA, Ribosomal