Effects of Ammonia Concentrations and Temperatures on Heamatococcus lacustris Growth

Abstract:

The effects on the growth characteristics of Heamatococcus lacustris of different ammonia concentrations（0.05~0.8 g/L） and different growth temperatures（22、25、28 ℃） and the effects of stress temperatures（30，35，38 ℃）on the astaxathin accumulation were studied in this paper. The main parameters OD，dry weight，chlorophyll a and astaxathin content were determined. The results show that Heamatococcus lacustris grows relatively better under lower concentration of ammonia nitrogen when using NH4Cl as nitrogen source. Its suitable growth conditions are as follows：temperature：22 ℃、NH4Cl：0.1 g/L，whereas the suitable stress temperature is 35 ℃.