NDLI: Stress response in two strains of the aquatic hyphomycete Heliscus lugdunensis after exposure to cadmium and copper ions

Content Provider	Springer Nature Link
Author	Braha, Bianca Tintemann, Herbert Krauss, Gudrun Ehrman, Jim Bärlocher, Felix Krauss, Gerd Joachim
Copyright Year	2006
Abstract	Biochemical responses to cadmium (Cd2+) and copper (Cu2+) exposure were compared in two strains of the aquatic hyphomycete (AQH) Heliscus lugdunensis. One strain (H4-2-4) had been isolated from a heavy metal polluted site, the other (H8-2-1) from a moderately polluted habitat. Conidia of the two strains differed in shape and size. Intracellular accumulation of Cd2+ and Cu2+ was lower in H4-2-4 than in H8-2-1. Both␣strains synthesized significantly more glutathione (GSH), cysteine (Cys) and γ-glutamylcysteine (γ-EC) in the presence of 25 and 50 μM Cd2+, but quantities and rates of synthesis were different. In H4-2-4, exposure to 50 μM Cd2+ increased GSH levels to 262% of the control; in H8-2-1 it increased to 156%. Mycelia of the two strains were analysed for peroxidase, dehydroascorbate reductase, glutathione reductase and glucose-6-phosphate dehydrogenase. With Cd2+ exposure, peroxidase activity increased in both strains. Cu2+ stress increased dehydroascorbate reductase activity in H4-2-4 but not in H8-2-1. Dehydroascorbate reductase and glucose-6-phosphate dehydrogenase activities progressively declined in the presence of Cd2+, indicating a correlation with Cd2+ accumulation in both strains. Cd2+ and Cu2+ exposure decreased glutathione reductase activity.
Starting Page	93
Ending Page	105
Page Count	13
File Format	PDF
ISSN	09660844
Journal	BioMetals
Volume Number	20
Issue Number	1
e-ISSN	15728773
Language	English
Publisher	Springer US
Publisher Date	2006-08-10
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	aquatic hyphomycetes Heliscus lugdunensis glutathione cadmium copper Physical Chemistry Biochemistry
Content Type	Text
Resource Type	Article
Subject	Metals and Alloys Biochemistry, Genetics and Molecular Biology Biomaterials Agricultural and Biological Sciences

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