Blue light regulates the rhythm of diurnal vertical migration in the raphidophyte red-tide alga Chattonella antiqua
Blue light regulates the rhythm of diurnal vertical migration in the raphidophyte red-tide alga Chattonella antiqua
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DOI：
10.1093/plankt/fbt006
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发表时间：
2013-05
影响因子：
2.1
通讯作者：
T. Shikata;S. Matsunaga;M. Iseki;Hiroyo Nishide;S. Higashi;Y. Kamei;M. Yamaguchi;I. Jenkinson;Masakatsu Watanabe
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文献类型：
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作者：
T. Shikata;S. Matsunaga;M. Iseki;Hiroyo Nishide;S. Higashi;Y. Kamei;M. Yamaguchi;I. Jenkinson;Masakatsu Watanabe
研究了光周期、波长和光通量率对沿海针杆藻Chattonella antiqua昼夜垂直迁移（DVM）循环的影响。我们首先在不同的光暗周期和光谱组合下观察了DVM。在连续的白色、UV-A或蓝光下，DVM遵循白色光预处理期间建立的LD周期，持续一个周期，然后变得心律失常。然而，在红光下，DVM的节奏在不同的LD制度下继续近似预处理期间。当C.在人工夜开始或结束时，用蓝光脉冲照射2 h，使DVM分别延迟或提前。注量率响应曲线表明DVM相移的蓝光阈值为10（2）mol光子m（2）s（1）。相移的等量子作用光谱在UV-A/蓝色区域（360 - 480 nm）达到峰值，这是在其自然栖息地中透射最多的光谱的一部分。我们证明了C. antiqua可以在其整个深度范围内感受到阳光中微弱的蓝色成分，使其无论天气和透明度如何，都可以将其DVM提示给昼夜周期。
We examined the effects of photoperiod, wavelength and light fluence rate on diurnal vertical migration (DVM) cycle in a coastal raphidophyte, Chattonella antiqua. We first observed the DVM under different combinations of lightdark (LD) cycles and light spectra. Under continuous white, UV-A or blue light, DVM followed the LD cycle established during the white light pre-conditioning, for one cycle, and then became arrhythmic. Under red light, however, the DVM rhythms under the different LD regimes continued approximately as during pre-conditioning. When C. antiqua cultured under continuous red light was exposed to a 2-h pulse of blue light at the beginning or end of artificial night, the DVM was delayed or advanced, respectively. The fluence rateresponse curve indicates a blue-light threshold of 10(2) mol photons m(2) s(1) for the DVM phase shift. The equal-quantum action spectra for phase shift peaked in the UV-A/blue region (360480 nm), which is the part of the light spectrum most transmitted in its natural habitat. We show that C. antiqua can sense the weak blue component of sunlight throughout its depth range, allowing it to cue its DVM to the daynight cycle regardless of weather and transparency.