Action Spectrum for Sporulation and Photoavoidance in the Plasmodium of Physarum polycephalum, as Modified Differentially by Temperature and Starvation
Action Spectrum for Sporulation and Photoavoidance in the Plasmodium of Physarum polycephalum, as Modified Differentially by Temperature and Starvation
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多头绒泡菌中孢子形成和避光的作用谱，经温度和饥饿差异修改
DOI：
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发表时间：
1996
影响因子：
3.3
通讯作者：
T. Ueda
中科院分区：
文献类型：
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作者：
T. Nakagaki;Shoji Umemura;Y. Kakiuchi;T. Ueda
摘要：粘菌多头绒泡菌的疟原虫在明亮的自然环境中形成孢子，这表明光行为与孢子形成之间存在关系。因此，研究了两种光相关现象的作用光谱以及其他环境条件的影响。除了有据可查的 UVA（近 350 nm）和蓝色（近 460 nm）区域之外，孢子形成类避光对 UVC（近 270 nm）和近红外（近 750 nm）也有反应。孢子形成和避光在较短波长下具有相似的敏感性，而前者在近红外光下的敏感性大约高 100 倍。疟原虫远离了宽光谱范围内的光。饥饿和 31°C（标准条件下为 25°C）的高温分别降低了对 UVA 和蓝光的避光能力。 UVC的高注量率抑制了疟原虫的节律性收缩，作用光谱在270 nm处达到峰值。这些结果表明，绒泡菌可能不是通过正趋光性而是通过减弱对阳光的负趋光性或通过其他可能的作用（例如趋水性）而停留在较亮的地方。疟原虫中可能至少有四种不同的光系统。
Abstract— The Plasmodium of the myxomycete Physarum polycephalum sporulates in bright natural environments, suggesting a relationship between photobehavior and sporulation. Thus, the action spectra for two light‐dependent phenomena as well as the effects of other environmental conditions have been studied. Sporulation like photo‐avoidance responded to UVC (near 270 nm) and near IR (near 750 nm) in addition to the well‐documented UVA (near 350 nm) and blue (near 460 nm) regions. Sporulation and photoavoidance had similar sensitivities in the shorter wavelengths, while the former was about 100 times more sensitive in near IR. The Plasmodium moved away from light in a wide spectral range. Starvation and high temperature at 31°C (25°C in standard conditions) reduced photoavoidance to UVA and to blue light, respectively. A high fluence rate of UVC suppressed the rhythmic contraction of the Plasmodium, and the action spectrum peaked at 270 nm. These results indicate that the Physarum Plasmodium may stay at brighter places not by positive phototaxis but by weakening the negative phototaxis to sunlight or by other possible taxes such as hydrotaxis. There may be at least four different photo‐systems in the Plasmodium.
DOI：
10.1073/pnas.92.18.8423
发表时间：
1995-08-29
影响因子：
11.1
作者：
LIN, C;AHMAD, M;CASHMORE, AR
通讯作者：
CASHMORE, AR