Abstract
Differential resistance to arsenate (AsO43-) is demonstrated here among populations of the ericoid mycorrhizal fungus Hymenoscyphus ericae isolated from Calluna vulgaris in natural heathland soils and soils contaminated with AsO43-.
Isolates (c. 25) of the fungus from each of two As and Cu mine sites, and a natural heathland site, were screened for AsO43- and Cu2+ resistance by growing isolates in media containing a range of AsO43- and Cu2+ concentrations.
H. ericae populations from the mine sites demonstrated resistance to AsO43- compared with the heathland population; the mine-site populations producing significant growth at the highest AsO43- concentration (4.67 mol m(-3)), whereas growth of the heathland population was almost completely inhibited. EC50 values for mine-site isolates were estimated to be 5-41-times higher than the heathland population. All isolates produced identical responses to increasing Cu2+ concentrations, with no differences observed between mine-site and heathland isolates.
Populations of H. ericae on the contaminated mine sites have developed adaptive resistance to AsO43-. By contrast, Cu2+ resistance appears to be constitutive. (C) New Phytologist (2001) 151: 265-270.
Original language | English |
---|---|
Pages (from-to) | 265-270 |
Number of pages | 5 |
Journal | New Phytologist |
Volume | 151 |
DOIs | |
Publication status | Published - 2001 |
Keywords
- ericoid mycorrhiza
- Hymenoscyphus ericae
- arsenate
- metal tolerance
- Calluna vulgaris
- copper
- HOLCUS-LANATUS L
- PHOSPHATE-UPTAKE SYSTEM
- HEAVY-METAL RESISTANCE
- CALLUNA-VULGARIS
- PISOLITHUS-TINCTORIUS
- ECTOMYCORRHIZAL FUNGI
- SUILLUS-LUTEUS
- YORKSHIRE FOG
- TOLERANCE
- GENETICS