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The osmotic responses of penicillium ochro chloron changes in internal solute levels in response to copper and salt stress

The osmotic responses of penicillium ochro chloron changes in internal solute levels in response to copper and salt stress

Journal of General Microbiology 130(8): 1969-1976

The marked Cu tolerance of P. ochro-chloron was confirmed as was its ability to grow in solutions of high salinity. The major low MW organic solutes present in P. ochro-chloron were glycerol, erythritol, arabitol, mannitol, sorbitol and trehalose. Of these, glycerol increased significantly during growth in high concentrations of Na+ or Cu2+, a 15-fold increase, relative to the control, occurring in concentrations of 0.5 M. Cell K+ increased with elevated external Na+ but decreased slightly with elevated external Cu2+. With high external Cu2+ mycelium maintained a constant level of Cu2+, with low levels of Na+ in all treatments. The high concentrations of glycerol induced by high external Na+ or Cu2+ had a significant osmotic effect, allowing growth in media of high osmolality. The exclusion of ions may have a gratuitous role in the Cu tolerance of P. ochro-chloron.

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Accession: 006729969

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DOI: 10.1099/00221287-130-8-1969

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