Environmental cues that regulate motility are poorly understood, but specific carbon and nitrogen sources, such as casamino acids (CAA), are known to stimulate motility in model organisms. However, natural environments are commonly more nutrient‐limited than laboratory growth media, and the effect of energy‐rich CAA on the motility of oligotrophic microorganisms is unknown. In this study, an extreme oligocarbotroph, Variovorax paradoxus YC1, was isolated from weathered shale rock within a disused mine level in North Yorkshire, UK. The addition of 0.1% CAA to minimal media significantly reduced the motility of YC1 after 72 h and inhibited swimming motility resulting in enhanced surface growth. We propose this response to CAA is a physiological adaptation to oligotrophy, facilitating the colonization of nutrient‐rich environments.

中文翻译：

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酪蛋白氨基酸可减缓运动能力并刺激表面生长，形成极度贫养状态。

调节运动的环境提示知之甚少，但是已知特定的碳和氮源（如酪蛋白氨基酸（CAA））会刺激模型生物的运动。但是，自然环境通常比实验室生长培养基更具营养限制，并且未知富含能量的CAA对贫营养微生物运动的影响。在这项研究中，一种极端的寡碳营养生物，Variovorax paradoxusYC1是从英国北约克郡废弃矿山中的风化页岩中分离出来的。在基本培养基中添加0.1％CAA会显着降低72小时后YC1的运动能力，并抑制游泳运动能力，从而导致表面生长增强。我们认为这种对CAA的反应是对寡营养的生理适应，有利于营养丰富的环境的定殖。