López-Figueroa F, Niell F X
Departamento de Ecología, Facultad de Ciencias, Universidad de Málaga, España.
Rev Esp Fisiol. 1988 Sep;44(3):287-94.
Chlorophyll a synthesis in the red alga Corallina elongata is controlled by phytochrome and by a specific blue light photoreceptor. Although the estimated photoequilibrium of phytochrome is similar in blue and red light, the amount of chlorophyll accumulated is greater in blue light, which implies the action of cryptochrome, according to the criteria for the specific blue light photoreceptor involvement. The amount of chlorophyll synthesized is greater when the level of photoequilibrium approaches 65% (in blue and red light) than with higher levels (72.7% in white light and 70.8% in green light). The action of phytochrome is demonstrated by the induction of chlorophyll synthesis after red pulses and the reversion after far red pulses. The reversion is not complete but the percentage of reversibility is high (85-90%). The amount of chlorophyll accumulated is greater in darkness after the application of red light pulses than in white light after the same light pulses. The induction of chlorophyll synthesis is greater after red pulses than after continuous red light. The existence of a fast destruction of chlorophyll in continuous light is observed. This destruction is greater in the high photoequilibrium of phytochrome (70-72%). The turnover times and the induction mechanism of chlorophyll synthesis must be very fast. This indicates the existence of a possible rapid adaptation to the change in light quality and intensity in the marine system.
在红藻长珊瑚藻中，叶绿素a的合成受光敏色素和一种特定蓝光光感受器的控制。尽管光敏色素在蓝光和红光下的估计光平衡相似，但蓝光下积累的叶绿素量更多，根据特定蓝光光感受器参与的标准，这意味着隐花色素的作用。当光平衡水平接近65%（在蓝光和红光下）时，合成的叶绿素量比更高水平（白光下72.7%，绿光下70.8%）时更多。红光脉冲后叶绿素合成的诱导以及远红光脉冲后的逆转证明了光敏色素的作用。逆转并不完全，但可逆百分比很高（85 - 90%）。红光脉冲处理后，黑暗中积累的叶绿素量比相同光脉冲后的白光下更多。红光脉冲后叶绿素合成的诱导比连续红光后更大。观察到连续光照下叶绿素存在快速破坏。在光敏色素的高光平衡（70 - 72%）下，这种破坏更大。叶绿素合成的周转时间和诱导机制一定非常快。这表明在海洋系统中可能存在对光质和强度变化的快速适应。
