【摘要】 通过对从新疆 ,青海等地采集的盐碱土样中分离获得的 43株嗜盐或耐盐放线菌以及4株典型菌株的NaCl耐受实验 ,对不同浓度的Na+ ,K+ ,Mg2 + ,Ca2 + 的选择性实验及pH耐受实验进行了研究。发现耐盐放线菌对Na+ ,K+ ,Mg2 + 有广泛的适应性 ,只有少数耐盐放线菌能在较低浓度的CaCl2 条件下生长 ;嗜盐放线菌对Na+ 有广泛的适应性 ,多数嗜盐放线菌生长所需的Na+ 可被K+ ,Mg2 + 所替代 ,而不能被Ca2 + 所替代 ,少数嗜盐放线菌的生长离不开Na+ ,对Na+ 有高度的专一性 ,是专嗜Na+ 的嗜盐放线菌 ,说明不同嗜盐放线菌对Na+ ,K+ ,Mg2 + ,Ca2 + 的适应有选择性。因此 ,提出自然环境中是否也存在类似的专嗜K+ 或专嗜Mg2 + 的嗜盐放线菌的推测。无论是嗜盐还是耐盐放线菌其pH生长范围都在 6 0～1 0之间 ,生长最适pH7 0～ 8 0。另外 ,嗜盐放线菌的分布与分离地点也有一定的相关性更多还原

【Abstract】 Studies on NaCl concentration, pH tolerance and selectivity to different concent rations of Na +, K +, Mg 2+ and Ca 2+ of 43 isolates from th e saline soils in XinJiang, HeBei and QingHai Provinces of China and 4 type stra ins were performed in this paper Results showed that halotolerant actinomycete s have extensiv e adaptability to Na +, K + and Mg 2+ and only a few of them can grow in low CaCl 2 concentration Halophilic actinomycetes have extensive adaptability to Na +, and for most halophilic actinomycetes, Na + can be substituted by K + , Mg 2+ , but not for Ca 2+ For some halophilic actinomycetes , it is necessary to have Na + for their growth It also showed that the growth of al l halophilic actinomycetes had se lectivity with different concentration of Na +, K +, Mg 2+ So it is pre sumed that only Kaliumphilic or Magnesiumphilic Actinomycetes maybe exist in hig h salt environments In addition, the growth pH range were 6 0～9 0 and the o ptimum pH were 7 0～8 0 not only for halophilic but also for halotolerant acti nomycetes The dis tribution of halophilic actinomycetes also have some relativity to isolation sit es更多还原