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Effect of Different Seawaters on the Development of Biochemically Deficient Mutants of Serratia marinorubra

机译：不同海水对沙雷氏菌生化缺陷突变体发育的影响

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The effect of different seawaters on survival and growth of biotin-, isoleucine-, and uracil-requiring mutants of the marine bacterium, Serratia marinorubra, has been investigated. Samples of seawater were collected from coastal waters, the California Current, and central North Pacific waters at depths of 1, 25, 50, 100, 250, and 500 m. The growth or survival of the test bacterium in basal medium prepared in these seawater samples was determined. The control water was synthetic or charcoal-treated natural seawater. In several experiments, the metabolite required by the bacterium was added to the basal medium 24 hr after inoculation, and the growth response was determined. Depending on the source, the seawater samples were both stimulating and inhibitory. Surface waters were more inhibitory than those taken at depth, where, in some cases, bacterial growth occurred. Seawater inhibition was related more to station depth than to the location of the station. The most toxic effects were found against the uracil-requiring mutant; the least, against the isoleucine-requiring mutant. The results of these studies and some laboratory experiments indicate that seawater toxicity is not primarily associated with the physical and biological properties of a particular water mass and that the same factor(s) may be responsible for the rapid death of bacteria in all waters.
机译：已经研究了不同海水对海洋细菌沙雷氏菌（Serratia marinorubra）生物素，异亮氨酸和尿嘧啶的突变体的存活和生长的影响。从沿海水域，加利福尼亚洋流和北太平洋中部水域的1、25、50、100、250和500 m深度采集海水样品。测定在这些海水样品中制备的基础培养基中测试细菌的生长或存活。对照水是合成的或木炭处理过的天然海水。在几个实验中，细菌所需的代谢产物在接种后24小时被添加到基础培养基中，并确定了生长反应。取决于水源，海水样品既具有刺激性又具有抑制性。地表水比在某些情况下发生细菌生长的深层水更具抑制作用。海水抑制与台站深度的关系比与台站位置的关系更大。发现对需要尿嘧啶的突变体毒性最大。至少，针对需要异亮氨酸的突变体。这些研究和一些实验室实验的结果表明，海水毒性与特定水团的物理和生物学特性并不主要相关，并且相同的因素可能导致所有水中细菌的快速死亡。

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