Biogeography of the Cyanidiaceae (Rhodophyta) based on 18S ribosomal RNA sequence data

摘要: The only eukaryotes found in highly acidic environments (pH 0.5–3) with elevated temperatures (up to 56 °C) are three species of unicellular red algae: Cyanidioschyzon merolae, Cyanidium caldarium and Galdieria sulphuraria. These habitats scattered all over the world usually very small. Because strictly acidophilic will not tolerate desiccation, distribution by wind or water seems unlikely. populations various might have been isolated for long times, providing a unique opportunity observe significant degree independent evolution under strong selective pressure. We investigated biogeography 18 isolates these algae comparison partial sequences 18S rRNA. A gene tree based on rRNA assigns 15 strains one branch high bootstrap values. share feature facultative heterotrophy, whether they were originally placed genus Galdieria. remaining — Galdier...