Journal
JOURNAL OF APPLIED PHYCOLOGY
Volume 24, Issue 4, Pages 907-914Publisher
SPRINGER
DOI: 10.1007/s10811-011-9711-2
Keywords
Carotenoids; Chlorophyll; Lipids; Nitrogen starvation; Proteins
Funding
- National Research Foundation (South Africa)/Hungarian Collaborative Project
- University of KwaZulu-Natal (South Africa)
- European Union
- [TAMOP-4.2.2-08/1-2008-0020]
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Many changes occur in the biochemical composition of microalgae in response to stress conditions. In the present study, two nitrogen-stressed Chlorella minutissima strains (MACC 360 and 452) were placed in media containing a range of nitrogen concentrations (7-700 mg L-1 N). Biomass, chlorophyll a and b, carotenoid, protein and lipid concentrations were monitored over 15 days. There was lower biomass accumulation in nitrogen-deficient treatments while lipid yields increased to 40-46% DW in response to nitrogen deficiency. Chlorophyll concentrations initially recovered in response to the nitrogen spike with maximum concentrations recorded on days 6-8 and decreased thereafter as nitrogen became limiting. In comparison, proteins recovered faster with maximum concentrations recorded on day 4. Carotenoid concentrations did not increase in response to the nitrogen spike.
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