Temperature is a critical factor for living organisms. Many microorganisms migrate toward preferable temperatures, and this behavior is called thermotaxis. In this study, the molecular and physiological bases for thermotaxis are examined in Chlamydomonas reinhardtii. A mutant with knockout of a transient receptor potential (TRP) channel, trp2‐3, showed defective thermotaxis. The swimming velocity and ciliary beat frequency of wild‐type Chlamydomonas increase with temperature; however, this temperature‐dependent enhancement of motility was almost absent in the trp2‐3 mutant. Wild‐type Chlamydomonas showed negative thermotaxis, but mutants deficient in the outer or inner dynein arm showed positive thermotaxis and a defect in temperature‐dependent increase in swimming velocity, suggesting involvement of both dynein arms in thermotaxis.

中文翻译：

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莱茵衣藻 TRP2 通道对纤毛运动的温度依赖性增强

温度是生物体的一个关键因素。许多微生物会向更适宜的温度迁移，这种行为称为趋热性。在这项研究中，研究了趋热性的分子和生理学基础莱茵衣藻。瞬时受体电位（TRP）通道被敲除的突变体，色氨酸2-3，表现出趋热性缺陷。野生型的游泳速度和纤毛跳动频率衣藻属随温度增加；然而，这种依赖于温度的运动性增强在色氨酸2-3突变体。野生型衣藻属显示出负趋热性，但外或内动力蛋白臂缺陷的突变体表现出正趋热性和温度依赖性游泳速度增加的缺陷，表明两个动力蛋白臂都参与趋热性。