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Abstract: The even development of mycelial spawn of Agaricus bisporus through the substrate is essential for effective sporophore development, good yields and quality. The effect of ionic and non-ionic osmotic (KCl, glycerol) and matric potential (PEG8000) stress, in the range -0.48 to -2.48 MPa, on temporal growth of mycelial culmres in vitro, at 18 and 25°C on a 5% malt extract agar medium, was smdied. The effects of these environmental stresses on endogenous sugars and sugar alcohols and internal total, osmotic and turgor potentials were quantified. A. bisporus mycelium was more sensitive to mafric than osmotic stress, regardless of temperature. The total water potentials, osmotic and mrgor potentials changed markedly as water sfress was increased. The synthesis and pattems of accumulation of sugar alcohols, particularly of glycerol, and mannitol was significantly different in non-stressed and waterstressed media. There were few changes in concentrations of glucose and trehalose in mycelia from the different treatments.
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