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Novel red algae in the Picoplankton? Klaus Valentin, Helga Mehl and Linda Medlin AWI Bremerhaven

Novel red algae in the Picoplankton? Klaus Valentin, Helga Mehl and Linda Medlin AWI Bremerhaven. multicellular red algae. Cryptophyte nucleomorphs & environmental seq. „Novel“ red algae (27 env. Seq.). But: no unicellular red algae in the tree!. Aim:

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Novel red algae in the Picoplankton? Klaus Valentin, Helga Mehl and Linda Medlin AWI Bremerhaven

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  1. Novel red algae in the Picoplankton? Klaus Valentin, Helga Mehl and Linda Medlin AWI Bremerhaven

  2. multicellular red algae Cryptophyte nucleomorphs & environmental seq. „Novel“ red algae (27 env. Seq.) But: no unicellular red algae in the tree!

  3. Aim: Establish an 18S dataset for the unicellular red algae - Get cultures (Göttingen, John West) - Isolate DNA - Run PCR - Sequence products OR - Clone Products, check by RFLP - Sequence different RFLP types - Compare to database ... is it really a red alga?

  4. Ribosomal DNA Phylogeny of the Bangiophycidae (Rhodophyta) and the Origin of Secondary Plastids Kirsten M. Müller, Mariana C. Olivera, Robert G. Sheath, and Debashish Battacharya American Journal of Botany 88(8):1390-1400 (2001)

  5. 100 Florideophyceae 100 Bangiales 100 Cryptophyte nucleomorphs 91 100 Porphyridiales 2 (Chroodactylon etc.) 100 Porphyridiales 3 (Porphyridium etc) Comsogonales, Erythropeltiales, Rhodochaetales 99 Porphyridiales 1 (Rhodella/Dixionella) 100 Galdieria sulfuraria Green algae

  6. Galdieria 1 (full) Cyanidium 1 (partial) 100 66 Nucleomorphs 100 Red 148 100 Red 214 Galdieria 2 (partaial) 78 100 Bangiales 100 Florideo. 87 Porphyridiales 1 Cyanidium 2 (partial) 100 Porphyridiales 2 Compsopogonales 100 Porphyridiales 3

  7. „known“ red algae Cryptophyte nucleomorphs Environmental seq. & Gemingera Environmental sequences (6) Cyanidium „Novel“ red algae

  8. Summary - The „novel red algal clade“ probably is rhodophytic. - The clade is not at the basis of the red algae but rather represents a fourth group of Porphyridiales. - Potentially there is a second red algal clade present, representing a sister group of the Cryptophyte nucleomorph, possibly closely related to Cyanidium caldarium.

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