Phosphate supply and arsenate toxicity in ectomycorrhizal fungi

✍ Scribed by Serena H. Chen; Mark Tibbett

• Book ID: 102391794
• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 116 KB
• Volume: 47
• Category: Article
• ISSN: 0233-111X
• DOI: 10.1002/jobm.200710320

✦ Synopsis

Three species of ectomycorrhizal fungi (Hebeloma crustuliniforme, Suillus variegatus and Cenococcum geophilum) were grown in axenic culture amended with range of AsO 4 3-concentration under three different PO 4 3-regimes. The fungi exhibited different growth responses to AsO 4 3-that varied with PO 4 3-concentration. Suillus variegatus showed the greatest sensitivity to AsO 4 3-, with growth almost completely inhibited in the presence of AsO 4 3-under the lower two PO 4 3treatments. Under the highest PO 4 3-treatment however, growth was enhanced and S. variegatus was able to persist at AsO 4 3-concentrations of up to 4 mM. Hebeloma crustuliniforme also showed high sensitivity to AsO 4 3-especially at low PO 4 3-concentration. The two higher PO 4 3-treatments had an ameliorating effect on AsO 4 3-toxicity in H. crustuliniforme. This demonstrates the ability of PO 4 3-to alleviate AsO 4 3-toxicity. The response from S. variegatus and H. crustuliniforme, both basidiomycetes, was in contrast to the ascomycete C. geophilum. This fungus demonstrated tolerance to AsO 4 3-when grown in culture solution and PO 4 3-did not have an ameliorating effect on AsO 4 3-toxicity in C. geophilum.