钠是瘤胃主要细菌生长所必需的营养物质。
Sodium, an obligate growth requirement for predominant rumen bacteria.
作者信息
Caldwell D R, Hudson R F
出版信息
Appl Microbiol. 1974 Mar;27(3):549-52. doi: 10.1128/am.27.3.549-552.1974.
Sodium is an obligate growth requirement for most currently recognized predominant species of rumen bacteria. The isoosmotic deletion of Na(+) from a nutritionally adequate defined medium completely eliminated growth of most species. Growth yields and rates were both a function of Na(+) concentration for Na(+)-requiring species, and Na(+) could not be replaced by Rb(+), Li(+), or Cs(+) when these ions were substituted for Na(+) at a concentration equivalent to an Na(+) concentration that supported abundant growth. Li(+), Cs(+), or Rb(+) was toxic at an Na(+)-replacing concentration (15 mM) but not at a K(+)-replacing concentration (0.65 mM). K(+) was also an obligate growth requirement for rumen bacteria in media containing Na(+) and K(+) as major monovalent cations, but K(+) could be replaced, for most species, by Rb(+). The quantities of Na(+) that support rapid and abundant growth of Na(+)-requiring rumen bacteria show that these organisms are slight halophiles. A growth requirement for Na(+) appears more frequent among nonmarine bacteria than has been previously believed.
钠是目前大多数已确认的瘤胃细菌优势种生长所必需的。从营养充足的限定培养基中同渗地去除Na⁺，会完全抑制大多数菌种的生长。对于需要Na⁺的菌种，生长产量和速率均是Na⁺浓度的函数，当用Rb⁺、Li⁺或Cs⁺以等同于支持旺盛生长的Na⁺浓度替代Na⁺时，Na⁺无法被这些离子取代。在替代Na⁺的浓度（15 mM）下，Li⁺、Cs⁺或Rb⁺具有毒性，但在替代K⁺的浓度（0.65 mM）下则无毒。在以Na⁺和K⁺作为主要单价阳离子的培养基中，K⁺也是瘤胃细菌生长所必需的，但对于大多数菌种而言，K⁺可被Rb⁺取代。支持需要Na⁺的瘤胃细菌快速且旺盛生长的Na⁺量表明，这些微生物是轻度嗜盐菌。对Na⁺的生长需求在非海洋细菌中似乎比之前认为的更为常见。
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