海洋細菌の飢餓生残 : 有機物の希薄な環境での生き残り

概要

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Many marine bacteria can survive long periods of low nutrient stress that exists in ocean. For example, marine psychrophilic Vibrio sp. ANT-300 has been reported to survive 2.5 years without nutrient supply. Starving cells utilize endogenous substrate for respiration, and then decrease in cell volume. However, bacteria which utilize cellular RNA cannot survive a long starvation. Bacterial species decreasing respiratory activity can survive a long starvation. Decrease of respiratory activity seems to be prerequisite for saving cellular materials and for long starvation survival. Cellular ATP of starving bacteria seems to remain at relatively higher level. Starving cells can quickly incorporate external materials without any lag periods. Starving cells appear to be not in dormant state. Many of starvation proteins which are not synthesized during growing stages are reported on Escherichia coli and marine bacteria. Synthesis of some of the starvation proteins is induced also by many other stresses like heat shock. The role of starvation proteins in long starvation survival has not been elucidated.
日本海洋学会の論文
1992-08-26