The first eukaryotic cells - Acid hot-spring algae - Evolutionary paths from prokaryotes to unicellular red algae via Cyanidium caldarium (PreRhodophyta) succession

Joseph Seckbach*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

The Cyanidiophyceae members (PreRhodophyta) may serve as a transitional algal group bridging the cyanobacteria and the unicellular Rhodophyta. This thermoacidic algal group is composed of three genera containing several species. We suggested placing these algae in progressively evolutionary steps: (Cyanidioschyzon → Cyanidium → Galdieria). This evolutional ladder is based upon various areas of research like biochemistry, amount of nuclear genome and shape of chloroplast nucleoid, ultrastructure and ecological aspects. The first alga -Cyanidioschyzon - is the cornerstone of this succession; it shows mixed features between cyanobacterium and archaebacteria (Thermoplasma-like cell). It demonstrates simple eukaryotic cellular features and has the smallest amount of nuclear and chloroplast DNA. The intermediate alga in this line, Cyanidium, is also a simple cell, but shows more progressive characterizations than the Cyanidioschyzon. The third taxon, Galdieria, is already very close to the unicellular rhodophytes (red algae) and indicates typical advanced eukaryotic characterization. We propose that Cyanidioschyzon (considered to be the simplest eukaryote) may have evolved from an association between Thermoplasma-like archaebacterium and a thermophilic cyanobacterium. Autogenous (non-symbiotic) compartmental steps may have taken place from Cyanidioschyzon to Cyanidium and then to Galdieria, and from this alga (group) towards the other unicellular red algae.

Original languageEnglish
Pages (from-to)335-345
Number of pages11
JournalJournal of Biological Physics
Volume20
Issue number1-4
DOIs
StatePublished - Mar 1995

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