Abstract
The effects of variations in nutrient cation levels on the growth and biochemistry of Chlorella were investigated. This study involved concentration-series experiments in which the levels of Mg2+, K+, and Ca2+ varied from deficiency to toxicity levels for growth. The nutrient sufficiency concentrations of Mg2+ and K+ were 0.08 and 0.10 meq/1, respectively. Deficiencies of Mg2+ or K+ reduced the growth rate, as well as cellular total nitrogen and unsaturated fatty acid levels. K+ deficiency increased total lipid levels, while total fatty acids were unaffected. Increasing Mg2+ or K+ concentrations in the nutrient media were accompanied by corresponding increases in growth rate and certain biochemical fractions. Calcium was without effect except at a toxicity level. Cellular sufficiency concentrations for Mg2+ and K+ were 0.3 and 1.2% of the dry weight, respectively.
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- Maccarthy J. J., Patterson G. W. Effects of Cation Levels of the Nutrient Medium on the Biochemistry of Chlorella: II. Factorial Experiment. Plant Physiol. 1974 Aug;54(2):133–135. doi: 10.1104/pp.54.2.133. [DOI] [PMC free article] [PubMed] [Google Scholar]