Message - 7th IAL Symposium
Message - 7th IAL Symposium
Message - 7th IAL Symposium
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The 7 th International Association for Lichenology <strong>Symposium</strong> 2012<br />
(2A-2-P10) Submission ID: <strong>IAL</strong>0182-00001<br />
PHOTOBIONT ACQUISITION, SPECIFICITY AND COEVOLUTION<br />
IN THE LICHEN GENUS BRYORIA<br />
Lindgren H. 1 , Myllys L. 1 , Högnabba F. 1 , Velmala S. 1 , Goward T. 2 , Halonen P. 3 , Holien H. 4 , Laitinen S. 1<br />
1 Botanical Museum, Finnish Museum of Natural History, Helsinki, Finland<br />
2 Herbarium,University of British Columbia, Vancouver, Canada<br />
3 Botanical Museum, University of Oulu, Oulu, Finland<br />
4 Faculty of Agriculture and Information Technology, Nord-Trndelag University College, Trondheim, Norway<br />
Lichen photobionts are assumed to coevolve with lichen mycobionts because of their close relationship.<br />
Photobionts have an essential role in lichen metabolism as providers of carbohydrates to the mycobiont.<br />
In the lichen genus Bryoria, the most common known photobionts belong to the coccoid green algal genus<br />
Trebouxia. In this study the acquisition, specificity and possible coevolution between Bryoria spp. and their photobionts<br />
were examined by constructing mycobiont and algal phylogenies with parsimony methods using three<br />
mycobiont loci (nuITS rDNA, GAPDH and mtSSU) and one algal locus (nuITS rDNA). According to the preliminary<br />
results the mycobionts of Bryoria smithii, B. bicolor, B. tenuis and B. nadvornikiana seem to be selective<br />
towards their photobionts implying a possible coevolutionary event in the past. All the other species included<br />
in the analyses seemed to be less selective in their photobiont acquisition. However, some geographical correlation<br />
was observed in section Implexae (i.e. in the group including B. capillaris, B. fuscescens, B. implexa s.<br />
lato, B. lanestris and B. subcana) non-sorediate American species being more restricted in their choice of algal<br />
partners.<br />
(2A-2-P11) Submission ID: <strong>IAL</strong>0199-00001<br />
TANGLES IN HORSEHAIR - PHYLOGENETIC STUDIES ON PENDENT BRYORIA<br />
Velmala S. 1 , Myllys L. 1 , Goward T. 2 , Holien H. 3 , Halonen P. 4<br />
1 Botanical Museum, Finnish Museum of Natural History, Helsinki, Finland<br />
2 Herbarium, Department of Botany, University of British Columbia, Vancouver, Canada<br />
3 Department of Resource Sciences, Nord-Trøndelag University College, Steinkjer, Norway<br />
4 Botanical Museum, University of Oulu, Oulu, Finland<br />
Bryoria Brodo & D. Hawksw. (horsehair lichens) is a widespread lichen genus occurring mainly on<br />
conifers in boreal forests. The species are recognized by usually dichotomously branched thallus with slender,<br />
hairlike, gray to blackish branches, sometimes bearing soralia and pseudocyphellae. Bryoria is regarded as<br />
one of the taxonomically most difficult macrolichen genera due to infraspecific morphological variation, rarity<br />
of sexual fruiting structures limiting the amount of diagnostic characters, and the occurrence of putative,<br />
morphologically intermediate specimens. Especially pendent species are highly variable in morphology, giving<br />
secondary chemistry an essential role in species recognition. According to our recent phylogenetic studies on<br />
Bryoria, the current taxonomic status of many pendent taxa, notably in the section Implexae (sensu Myllys et al.),<br />
is questionable. The aim of our study is to examine with more extensive data sampling 1) the monophyly of the<br />
five taxa placed in section Implexae, i.e., Bryoria capillaris (Ach.) Brodo & D. Hawksw., B. fuscescens (Gyeln.)<br />
Brodo & D. Hawksw., B. implexa (Hoffm.) Brodo & D. Hawksw. (with five chemotypes sensu Holien), B. lanestris<br />
(Ach.) Brodo & D. Hawksw. and B. subcana (Nyl. ex Stizenb.) Brodo & D. Hawksw., and 2) if specimens from<br />
different geographical areas are genetically isolated. We reconstruct a phylogeny for the group using four DNA<br />
regions in addition to morphological and chemical characters. Our results indicate that the taxonomic status of<br />
some species should be re-evaluated. For instance North American and European B. capillaris represent taxonomically<br />
distinct entities. Furthermore, some of the taxa traditionally regarded as separate species, such as B.<br />
chalybeiformis and B. fuscescens, fall into a variation range of a single species. In addition, a new undescribed<br />
North American species will be presented.<br />
109<br />
2A-2-P