Abstract
The growth of Nitella hookeri A.Br. in non-axenic cultures, with or without soil extract, is not appreciably stimulated by the addition of vitamins, coenzymes and growth hormones. Vitamins B1, B6 and nicotinamide increased growth slightly but only at concentrations exceeding those found in the field. Kinetin inhibited growth at all concentrations.
A temperature of 17°C gave the best growth measured by linear increment, dry weight and fresh weight. Growth ceased at 10°C or 25°C. Increased light intensities gave increasing growth but 600 lux for a 12 hour day appeared to be the best long term conditions. Patterns were confused in showing differences between the parameters measured and indicate a more rigid assessment of growth is required for such studies.
The factors defined by the laboratory experiments are in general accord with field conditions in the Rotorua lakes where Nitella grows well. However, winter growth at temperatures of about 10°C still occurs in the field so that culture conditions have not completely defined all growth factors.
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Starling, M.B., Chapman, V.J. & brown, J.M.A. A Contribution to the Biology of Nitella hookeri A. Br. in the Rotorua Lakes, New Zealand II. Organic nutrients and physical factors. Hydrobiologia 45, 157–168 (1974). https://doi.org/10.1007/BF00013998
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DOI: https://doi.org/10.1007/BF00013998