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一株中度嗜盐菌halomonassp.ny-011的耐盐特性及机理

DOI: 10.3724/SP.J.1145.2010.00256, PP. 256-260

Keywords: 盐单胞菌属,中度嗜盐菌,耐盐特性,耐盐机理,相容性溶质,四氢嘧啶

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Abstract:

对本实验室分离到的一株中度嗜盐菌halomonassp.ny-011的耐盐特性和耐盐机理进行了初步研究.ny-011在lb培养基中最大能耐受260g/lnacl浓度,在m63培养基中能耐受大于150g/lnacl浓度.cl-的缺少对ny-011的耐盐生长有明显抑制,k+较li+和mg2+更适合于为ny-011提供内部渗透压力.ny-011通过在胞内积累k+、游离氨基酸及其他相容性溶质对抗胞外渗透压力.ny-011胞内相容性溶质组成随培养基nacl浓度变化而变化,四氢嘧啶是最主要的组成成分,含量随培养基nacl浓度增加而增加,120g/lnacl时浓度可达到71.5mg/g干重.ny-011还可吸收胞外的四氢嘧啶和甜菜碱以平衡外界高渗透压.随着培养基中nacl浓度的提高,ny-011菌体蛋白的合成受到明显抑制.图5表2参24

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