The osmotic responses of Penicillium ochro-chloron: Changes in internal solute levels in response to copper and salt stress

G. M. Gadd, J. A. Chudek, R. Foster, R. H. Reed

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    43 Citations (Scopus)

    Abstract

    The marked copper tolerance of Penicillium ochro-chloron has been confirmed as has its ability to grow in solutions of high salinity. The major low molecular weight 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. It is concluded that 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 copper tolerance of P. ochro-chloron.

    Original languageEnglish
    Pages (from-to)1969-1975
    Number of pages7
    JournalJournal of General Microbiology
    Volume130
    Issue number8
    DOIs
    Publication statusPublished - 1 Aug 1984

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