Recent Topics Posters
Parnmen, Sittiporn .
Using molecular data to understand patterns of chemical variation in the Cladia aggregata complex (Cladoniaceae) .
Cladoniaceae is a family of lichenized ascomycetes that includes 13 genera and has a worldwide distribution. Within the family, the small genus Cladia has received attention of taxonomists, since the species circumscription has always been difficult based on enormous morphological and chemical plasticity. Furthermore, the unique morphology of the genus has led to the description of its own family Cladiaceae, which has been rejected by molecular data and hence the genus is recognized within Cladoniaceae. Currently, 14 species are accepted in the genus, most of them restricted to New Zealand and temperate Australia. Cladia is characterized by the presence of numerous perforations along the vertical thalli, called pseudopodetia. Within the genus, the Cladia aggregata complex is considerably difficult and different authors accepted one to seven species to classify the diversity in this group. The aims of this study were to (i) test the phylogenetic placement of the Cladia aggregata complex within Cladoniaceae and (ii) investigate patterns of the chemical variation observed in the Cladia aggregata complex using molecular data. Specimens from several countries, including Cuba, India, Thailand, the Philippines, Australia and New Zealand were studied. These specimens encompassed the Cladia aggregata complex with four recognized chemotypes, and other members within the Cladoniaceae. Genes targeted included the partial GAPDH gene, partial RPB2 gene and ITS region. In a preliminary analysis only ITS sequences were employed. Based on different analyses (maximum parsimony, maximum likelihood, Bayesian approach) of the ITS region, Cladia was supported as monophyletic. Within the Cladia aggregata complex the phylogeny was not congruent with the chemical data, indicating that some of the accepted chemotypes do not reflect independent lineages.
Log in to add this item to your schedule
1 - Srinakharinwirot University, Department of Biology, Faculty of Science, Bangkok, Thailand, Thailand
Presentation Type: Recent Topics Poster
Location: Event Tent/Cliff Lodge
Date: Monday, July 27th, 2009
Time: 5:30 PM