Growth and pigment accumulation in nutrient-depleted Isochrysis aff. galbana T-ISO

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Abstract

The effect of three different nutrient depletions (nitrogen, sulphur and magnesium) on the growth and pigment accumulation of the haptophyte Isochrysis aff. galbana (clone T-ISO) has been studied. Pigments were quantified based on RP-UHPLC-PDA-MSn analysis. All nutrient depletions led to reduced maximal biomass concentrations. Besides, all nutrient-depleted cultures accumulated 3-hydroxyechinenone. To our knowledge, this is the first time that 3-hydroxyechinenone has been found in I. aff. galbana T-ISO. Most 3-hydroxyechinenone, as well as the most echinenone and diatoxanthin, were found in the nitrogen-limited culture in which a more severe limitation resulted in higher cellular contents. Similar to accumulation of diatoxanthin, accumulation of 3-hydroxyechinenone and echinenone may be part of a global (stress) response mechanism to oversaturating light conditions.
Original languageEnglish
Pages (from-to)1421-1430
JournalJournal of Applied Phycology
Volume25
Issue number5
DOIs
Publication statusPublished - 2013

Keywords

  • alga dunaliella-bardawil
  • secondary carotenoid accumulation
  • fatty-acid-metabolism
  • beta-carotene
  • haematococcus-pluvialis
  • triacylglycerol accumulation
  • astaxanthin synthesis
  • commercial production
  • nitrogen starvation
  • green microalga

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