Differences in adaptation to light and temperature extremes of Chlorella sorokiniana strains isolated from a wastewater lagoon

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  • Aafaf Krimech
  • Mark Helamieh
  • Melina Wulf
  • Ines Krohn
  • Ulf Riebesell
  • Ouafa Cherifi
  • Laila Mandi
  • Martin Kerner

Presently, two Chlorella sorokiniana strains sampled during summer (CS-S) and winter (CS-W) from a maturation pond and isolated by dominance were studied on their behavior on temperature and light extremes in batch experiments. Although both strains showed no differences in their tolerance of temperatures up to 45 °C, the growth rates, pigment contents and fatty acid compositions in response to PAR at 700 and 1,500 µmol m−2 sec-1 differed. CS-W was less affected by photoinhibition and maintained constantly high growth rates. High radiation resulted in both strains in an equivalent decrease of chlorophyll a and accessory pigments indicating that the latter did not function as a light filter. PUFAS (18:3 and 16:3) increased in CS-W at high radiation by > 60% and decreased in CS-S by 8 %. Results indicate that CS-W is highly favorable for mass cultivation particularly in outdoors, in which diurnal variations of solar radiation occur.

Original languageEnglish
Article number126931
JournalBioresource Technology
Publication statusPublished - 01.04.2022
Externally publishedYes

Bibliographical note

Copyright © 2022. Published by Elsevier Ltd.

    Research areas

  • Isolation by dominance, Microalgae, Outdoor mass cultivation, Pigment and fatty acid composition, Reuse of treated wastewater, adaptation to extreme conditions
  • Chemistry