A comparative assessment of growth, pigment and enhanced lipid production by two toxic freshwater cyanobacteria Anabaena circinalis FSS 124 and Cylindrospermopsis raciborskii FSS 127 under various combinations of nitrogen and phosphorous inputs
Nitrogen and phosphorous are important nutritional regulators for the growth of cyanobacteria, thereby having a significant impact in bloom formation by toxic species. Usage of toxic cyanobacteria for increasing valuable metabolite production by nutrient manipulation is still unexplored. Hence, the...
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Veröffentlicht in: | Environmental science and pollution research international 2021-04, Vol.28 (13), p.15923-15933 |
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Sprache: | eng |
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Zusammenfassung: | Nitrogen and phosphorous are important nutritional regulators for the growth of cyanobacteria, thereby having a significant impact in bloom formation by toxic species. Usage of toxic cyanobacteria for increasing valuable metabolite production by nutrient manipulation is still unexplored. Hence, the current work is aimed to estimate and compare growth, pigment, and increased lipid production coupled with the identification of fatty acids between two toxic strains—
Anabaena circinalis
FSS 124 and
Cylindrospermopsis raciborskii
FSS 127 under various combinations of these two nutrients. Low level of nitrogen and phosphorous enhanced lipid content in both strains (˃ 20% and 30% respectively) and
C. raciborskii,
respectively. Lipid productivity in low phosphorous concentration (P0.5) was achieved significantly high in
C. raciborskii
. Similarly, a substantial amount of carotenoids was obtained at reduced nitrogen and phosphorous in
C. raciborskii
accompanied by lessened growth and Chl a concentration. Unlikely, enough biomass (˃ 2 g L
−
1
) was produced at high nutrient levels in both species. Comparative statistical significance (
p
< 0.05) was found between two species regarding biomass production, chlorophyll concentration, lipid content, and productivity and between these factors in each species under both nutrient variations. FAME of
Cylindrospermopsis
is composed of saturated fatty acids (˃ 50%) and MUFA (˃ 25%) while
Anabaena
contains PUFA (˃ 21%) additionally. However, the study highlights
C. raciborskii
as potential lipid and carotenoid producer at nutrient stress and finds a novel way to utilize these cyanobacterial biomasses, which cause immense environmental hazards and life threats. |
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ISSN: | 0944-1344 1614-7499 |
DOI: | 10.1007/s11356-020-11754-4 |