Kim I H, Prusti R K, Song P S, Häder D P, Häder M
Biochim Biophys Acta. 1984 Jun 29;799(3):298-304. doi: 10.1016/0304-4165(84)90274-5.
Negative phototactic orientation, step-up photophobic responses and light-induced action potentials have been studied in the ciliate Stentor coeruleus. A resolved action spectrum, based on fluence rate-response curves, is consistent with stentorin as the photoreceptor. Calcium flux blockers prolong the response time for ciliary stop and reversal and inhibit step-up photophobic responses. Drugs believed to affect the membrane-bound calcium pump likewise inhibit phobic responses. On the other hand, alpha-phosphatidic acid promotes Ca2+-influx and enhances the photophobic sensitivity of the organism, thus providing an unambiguous evidence for the role of Ca2+ influx. A change in the response time decreases the degree of phototactic orientation, indicating that negative phototaxis in this organism is brought about by subsequent phobic responses of individual rows of cilia as the associated photoreceptor granules experience an increase in light intensity when the organism rotates during forward locomotion in lateral light.
已对纤毛虫天蓝喇叭虫的负趋光性定向、增强型避光反应和光诱导动作电位进行了研究。基于光通量率-反应曲线得出的解析作用光谱与支架色素作为光感受器一致。钙通量阻滞剂延长了纤毛停止和反转的反应时间，并抑制增强型避光反应。据信影响膜结合钙泵的药物同样会抑制避光反应。另一方面，α-磷脂酸促进Ca2+内流并增强生物体的避光敏感性，从而为Ca2+内流的作用提供了明确的证据。反应时间的变化会降低趋光性定向的程度，这表明在这种生物体中，负趋光性是由单个纤毛排随后的避光反应引起的，因为当生物体在侧光下向前移动时旋转，相关的光感受器颗粒会经历光强度的增加。
