细胞外钙离子与钾离子的比例会影响天蓝喇叭虫的光反应。

The ratio of extracellular Ca2+ to K+ ions affects the photoresponses in Stentor coeruleus.

Iwatsuki K, Song P S

Tsukuba Life Science Laboratory, Nippon Petrochemicals Co., Ltd, Ibaraki Japan.

Comp Biochem Physiol A Comp Physiol. 1989;92(1):101-6. doi: 10.1016/0300-9629(89)90749-4.

Abstract

Stentor coeruleus exhibits negative phototaxis (due to phototactic orientation response) and step-up photophobic response (avoiding reaction) to visible light. 2. The effect of Ja-value ([K+]/[Ca2+]1/2) and calcium ion concentration of the surrounding medium on the photoresponses in Stentor were studied. 3. The both types of photoresponses in Stentor are greatly affected by the Ja-value. A higher Ja-value medium suppressed the step-up photophobic response of Stentor, whereas the organism showed a higher degree of phototactic orientation response in higher Ja-value solutions. 4. The effect of the Ja-value on the step-up photophobic response was opposite to that on the phototactic orientation response. 5. With increasing calcium concentration but at a constant Ja-value, the number of Stentor showing the step-up photophobic response increased, whereas the phototactic orientation response of Stentor was suppressed at higher Ca2+ concentrations. 6. The effect of the calcium concentration on the photophobic response was also opposite to that on the phototactic orientation response, as in the case of Ja-value effect.

摘要

天蓝喇叭虫对可见光表现出负趋光性（由于趋光定向反应）和增强的畏光反应（回避反应）。2. 研究了Ja值（[K⁺]/[Ca²⁺]¹/₂）和周围介质中钙离子浓度对喇叭虫光反应的影响。3. 喇叭虫的这两种光反应都受到Ja值的极大影响。较高Ja值的介质抑制了喇叭虫的增强畏光反应，而在较高Ja值的溶液中，该生物体表现出更高程度的趋光定向反应。4. Ja值对增强畏光反应的影响与对趋光定向反应的影响相反。5. 在Ja值恒定的情况下，随着钙浓度的增加，表现出增强畏光反应的喇叭虫数量增加，而在较高Ca²⁺浓度下，喇叭虫的趋光定向反应受到抑制。6. 与Ja值的影响情况一样，钙浓度对畏光反应的影响也与对趋光定向反应的影响相反。