Magnesium Tolerance and Enrichment Characteristics of Armillariella mellea
蜜环菌对镁的耐性和富集特性

The impact of magnesium on growth, magnesium tolerance and enrichment features, as well as changes in activity of antioxidant enzymes under high-magnesium-concentration stress in Armillariella mellea were investigated. Magnesium at concentrations between 3?15 g/L in growth media promoted the growth of mycelia of A. mellea, but inhibited the growth at concentrations above 19 g/L. The formation and biomass production of fruiting body were not affected when magnesium concentration was below 11 g/L. At magnesium concentrations above 11 g/L the fruiting body formation stopped. The Mg content in crustose aerial hypha and rhizomorphs of A. mellea increased with increasing Mg concentration in growth medium up to a concentration of 16 g/L, but ceased to increase when the Mg concentration in medium was over 16 g/L. The Mg content in fruiting body of A. mellea grown on medium containing 9 or 10 g/L Mg was significantly different from that on control medium. The activity of antioxidant enzymes including peroxide (POD), catalase (CAT) and superoxide dismutase (SOD) in crustose aerial hypha and rhizomorphs of A. mellea, as well as the differences in the activity of antioxidant enzymes increased with increasing Mg concentration in growth medium.