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Mechanism for mercury tolerance in fungi. [Aspergillus niger; Rhizoctonia solani; Pythium ultimum]

Journal Article · · Phytopathology; (United States)
OSTI ID:5119937
;

Aspergillus niger was protected from mercury (Hg) poisoning by sulfhydryl (SH) compounds (glutathione and cysteine) in culture experiments, whereas Rhizoctonia solani and Pythium ultimum were not protected. Two- to 30-day-old mycelium of A. niger was found to be more tolerant to Hg than either younger or older mycelia. Mycelia of the other fungi were sensitive regardless of age. Mercury tolerance of A. niger mycelium was altered when sulfur nutrition was modified; it was greater after growth on a substrate containing reduced sulfur than after growth on one containing sulfate. The Hg tolerance of A. niger mycelium appears to be due to a pool of intracellular SH that is free of protein and that protects enzyme systems by forming complexes with Hg as it is taken up by the thallus. Potato-dextrose broth-grown mats of A. niger contained about 100 ..mu..g of SH/g of dry mycelia after 36 hr and after 5 days. R.. solani had about 9 ..mu..g of SH/g of mycelia after 5 days; a measurable amount was not recovered from P. ultimum. 20 references, 1 figure, 2 tables.

Research Organization:
Texas A and M Univ., College Station
OSTI ID:
5119937
Journal Information:
Phytopathology; (United States), Journal Name: Phytopathology; (United States) Vol. 54; ISSN PHYTA
Country of Publication:
United States
Language:
English

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Related Subjects

560303* -- Chemicals Metabolism & Toxicology-- Plants-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AGE DEPENDENCE
AMINO ACIDS
ASPERGILLUS
BIOLOGICAL EFFECTS
BODY
CARBOXYLIC ACIDS
CYSTEINE
DATA
DRUGS
ELEMENTS
EXPERIMENTAL DATA
FUNGI
GLUTATHIONE
GROWTH
INFORMATION
MERCURY
METALS
MYCELIUM
NONMETALS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
PEPTIDES
PLANT TISSUES
PLANTS
POLYPEPTIDES
PROTEINS
RADIOPROTECTIVE SUBSTANCES
RESPONSE MODIFYING FACTORS
SENSITIVITY
SUBSTRATES
SULFATES
SULFUR
SULFUR COMPOUNDS
THIOLS
TISSUES
TOXICITY