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Bioresour Technol. 2014 Mar;156:408-11. doi: 10.1016/j.biortech.2014.01.092. Epub 2014 Jan 30.

Phosphorus limitation and starvation effects on cell growth and lipid accumulation in Isochrysis galbana U4 for biodiesel production.

Author information

1
School of Molecular and Cell Biology, University of the Witwatersrand, Private Bag 3, Wits 2050, South Africa. Electronic address: Ashira.Roopnarain@students.wits.ac.za.
2
School of Molecular and Cell Biology, University of the Witwatersrand, Private Bag 3, Wits 2050, South Africa.
3
School of Animal, Plant and Environmental Science, University of the Witwatersrand, Private Bag 3, Wits 2050, South Africa.

Abstract

The effect of varying levels of phosphorus (P) on Isochrysis galbana U4 growth, pigmentation and lipid accumulation were investigated. A reduction in the P content to 25% of the recommended level for f/2 medium did not lead to declines in cell growth rates or lipid accumulation levels relative to the cultures maintained on medium supplemented with the normal P dose. Evidence suggesting that the recommended P supply in f/2 exceeds the requirements for maximal algal growth has obvious economic implications for the mass production of I. galbana for biodiesel production. When P supply was in excess this species was also found to accumulate intracellular levels of P that exceeded by up to 6 times its P requirements for growth and cell division. The reduction in P concentration to levels below 25% resulted in P starvation stimulated chlorophyll reductions and carotenoid and lipid accumulation in this species.

KEYWORDS:

Isochrysis galbana U4 growth; Isochrysis galbana U4 lipid accumulation; Isochrysis galbana U4 pigmentation; Phosphorus accumulation in Isochrysis galbana U4

PMID:
24534441
DOI:
10.1016/j.biortech.2014.01.092
[Indexed for MEDLINE]
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