Tetraedron minimum, first reported member of hydrodictyaceae to accumulate secondary carotenoids

Philipp Doppler, Christoph Kornpointner, Heidi Halbwirth, Daniel Remias, Oliver Spadiut

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


We isolated a novel strain of the microalga Tetraedron minimum in Iceland from a terrestrial habitat. During long-term cultivation, a dish culture turned orange, indicating the presence of secondary pigments. Thus, we characterized T. minimum for growth and possible carotenoid production in different inorganic media. In a lab-scale photobioreactor, we confirmed that nitrogen starva-tion in combination with salt stress triggered a secondary carotenoid accumulation. The development of the pigment composition and the antioxidant capacity of the extracts was analyzed through-out the cultivations. The final secondary carotenoid composition was, on average, 61.1% astaxanthin and 38.9% adonixanthin. Moreover, the cells accumulated approx. 83.1% unsaturated fatty acids. This work presents the first report of the formation of secondary carotenoids within the family Hy-drodictyaceae (Sphaeropleales, Chlorophyta).

Original languageEnglish
Article number107
Pages (from-to)1-14
Number of pages14
Issue number2
Publication statusPublished - Feb 2021


  • Adonixanthin
  • Antioxidant capacity
  • Astaxanthin
  • Fatty acid profile
  • Nitrogen star-vation
  • Palmelloids
  • Pigment composition
  • Salt stress
  • Stirred photobioreactor


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