Variation in cell composition and utilization of N and P for growth of Selenastrum capricornutum [cell nutrient content, organic N-compounds, organic P-compounds, yield coefficients, green alga, chlorophyll a, nitrogen, phosphorus]
1980
Claesson, A. (Uppsala Univ. (Sweden). Inst. of Physiological Botany)
Cell material from different phases of growth for the green alga Selenastrum capricornutum Printz was analysed for major elements and chlorophyll a content. The ranges in percentage of the dry weight were 50-80 per cent, 4.4-8.8 per cent, 0.24-3.0 per cent, and 0.20-3.23 per cent for C, N, P and chlorophyll a, respectively. The dry weight per cell varied 2.3 times between different growth phases. A N/P-quotient of about 10 (by weight) was found to be a critical level for Selenastrum when these elements were the most limiting nutrients for growth. 31 different organic N-compounds were tested as single N sources in growth experiments with Selenastrum. At least 19 of them could be utilized to varying extent for algal growth. Three organic P-compounds of six tested, were utilized for algal growth. Yield coefficients (cubic mm cell volume/mg limiting nutrient element) for Selenastrum were determined with NO-3 - N(y-N=134), NH-4 - N(Y-N=111) and PO-4 - P(Y-P=2580).
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