过量钠盐和盐渍土壤提取液对3种外生菌根真菌生长的影响

Response of three species of ectomycorrhizal fungi to excessive Na and extracting solution of saline soil in growth and biomass

美味牛肝菌(Boletusedulis)、红绒盖牛肝菌(Xerocomuschrysenteron)和铆钉菇(Gomphidiusviscidus)3种外生菌根真菌在不同浓度钠盐(0.05、0.10和0.20mol·L-1)和东营地区盐渍土壤提取液中培养,结果表明:钠盐处理促进了美味牛肝菌菌丝生长,生物量积累增加,而红绒盖牛肝菌和铆钉菇菌丝生长明显受到抑制。在土壤提取液培养条件下,供试3菌种菌丝的生长均受到极显著抑制。在不同浓度钠盐处理下,菌丝中钠元素的含量随培养基中钠盐浓度的增加而提高,说明菌丝对钠元素有较强的吸收能力。但不同菌种菌丝对钠元素的吸收和积累方式存在显著差异。

Characteristics and tolerance of three species of ectomycorrhizal fungi,Boletus edulis,Xerocomus chrysenteron and Gomphidius viscidus,growing in media different in concentration of sodium salts and in extracting solution of the saline soil collected from Dongying were studied.The results show that all of the Na treatments stimulated growth and biomass accumulation of B.edulis,but significantly inhibited growth of X.chrysenteron and G.viscidus.In the treatment of saline soil solution growth of all the 3 species was inhibited to an extremely significant extent,which is presumably related to lack of other essential nutrients and excess of K and Cl.In Na treatments,the content of Na in mycelia increased with the Na concentration in the medium,indicating strong Na absorption capacity of mycelia.However,remarkable differences could be observed in absorption and accumulation of sodium between the 3 strains of tested ectomycorrhizal fungi.