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EFFECT OF DISSOLVED OXYGEN PARTIAL PRESSURE ON THE ACCUMULATION OF ASTAXANTHIN IN CHEMOSTAT CULTURES OF HAEMATOCOCCUS LACUSTRIS (CHLOROPHYTA)
Author(s) -
Lee YuanKun,
Ding SunYeun
Publication year - 1995
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.0022-3646.1995.00922.x
Subject(s) - chemostat , partial pressure , chlorophyta , saturation (graph theory) , biology , steady state (chemistry) , astaxanthin , botany , haematococcus pluvialis , dry weight , oxygen , algae , chemistry , carotenoid , genetics , mathematics , organic chemistry , combinatorics , bacteria
The effect of dissolved oxygen partial pressure on the accumulation of astaxanthin in the green alga Haematococcus lacustris ( Gir.) Rostaf (UTEX16) was studied in N‐limited continuous chemostat cultures. The steady‐state astaxanthin content measured against culture volume, cell number, and biomass dry weigh of Haematococcus cultures was proportional to the dissolved O 2 partial pressure in the culture medium, over the range of 0–50% O 2 The steady‐state biomass dry weight concentrations remained at between 0.52 and 0.57 g. L ‐1 over the range of dissolved O 2 partial pressure studied. Steady‐state cell densities at dissolved O 2 partial pressures above the air saturation level (1.13–1.58 × 10 5 cells.mL ‐1 ) were about half of that measured at lower dissolved O 2 partial pressures (2.42–2.63 × 10 5 cells.mL ‐1 ). Both biflagellated zoospores and nonmotile aplanospores were found at steady state. The fraction of nonmotile cells was higher at dissolved O 2 partial pressures above the air saturation level (94.44–98.01%) than at dissolved O 2 partial pressure below the air level (79.64–86.12 and 91.75% ).