盐胁迫对3种外生菌根真菌生长的影响

Response of Three Ectomycorrhizal Fungal Species to Salt Stress

采用离体培养的方法，研究了不同盐浓度胁迫对红绒盖牛肝菌（ Xerocomus chrysenteron）、灰环粘盖牛肝菌（Suillus laricinus）、灰鹅膏菌（Amanita vaginata）3种外生菌根真菌的生长速度、生物量、菌丝Na＋质量分数的影响。结果表明：红绒盖牛肝菌耐盐性最强，盐胁迫并未影响其生长，在高浓度（0．6～0．8 mol· L^-1）盐胁迫下，红绒盖牛肝菌的生长速度和生物量显著高于其他2种菌株（P＜0．05），其体内的Na＋质量分数也显著低于其他2种菌株（P＜0．05）。灰环粘盖牛肝菌对盐胁迫最为敏感，低浓度（0．2 mol· L^-1）的盐胁迫就可以影响其生长曲线，降低其生长速度，其在高浓度盐胁迫下体内的Na＋质量分数也显著高于其他2种菌株（ P＜0．05）。灰鹅膏菌耐盐性居中，随着盐浓度的增加，其生长速度和生物量逐渐降低。

The experiment was conducted to determine the diameter growth rates, biomass yield and Na＋content of three fungal species involving Xerocomus chrysenteron, Suillus laricinus and Amanita vaginata by culture in vitro method under different content of salt stress.Between three species, X.chrysenteron shows the highest growth rates, the best biomass yield in high content of salt stress （0.6-0.8 mol· L^-1 ） and the lowest content of Na＋in the mycelia in the salt gradient test and X.chrsy enteron has the most tolerance to salt stress and rejection to Na＋under salt stress.S.laricinus is the most sensitive to salt stress, its growth rate is depressed in salt content of 0.2 mol· L^-1 , and its Na＋content in the mycelia is the highest in salt content of 0.6-0.8 mol· L^-1 .The growth rate and biomass yield of A.vaginata are reduced with the increase of salt content .