Production of a new type photosynthetic organism that utilizes low energy light.

所有已知的光合生物无一例外都是以叶绿素a作为光合反应中心色素蛋白复合物中的光敏色素。叶绿素a利用红光促进电子转移反应。然而，我们发现，一种新型的蓝藻Acaryochloris marina经历了一种新的色素叶绿素d的产氧光合作用，该色素叶绿素d在720-740 nm处吸收，其波长比叶绿素a吸收的660-700 nm红光的波长长。我们确定了反应中心的色素的光系统I和II是叶绿素d，其特征在于的能量水平的重做组件的氧化侧的光系统II。我们测量了这些生物体叶绿素d的延迟荧光。进一步研究了该菌对抗生素的敏感性、分化程度、反应中心的电子传递成分。在此基础上，对该菌的光合作用机理进行了初步探讨。

All the ever-known photosynthetic organisms use chlorophyll a as the photoactive pigments in their photosynthetic reaction center pigment protein complexes with no exceptions. Chlorophyll a uses red light for the promotion of electron transfer reactions. We, however, identified that a new type of cyanobacterium Acaryochloris marina undergoes oxygenic photosynthesis with a new pigment chlorophyll d that absorbs at 720-740 nm, which wavelength is longer than that of 660-700 nm red light absorbed by chlorophyll a. We identified the reaction center pigments of photosystems I and II to be chlorophyll d, characterized the energy levels of the redo components in the oxidizing side of photosystem II. We measured delayed fluorescence of chlorophyll d from these organisms. We further studied the sensitivity to the antibiotics, differentiation of this organism, electron transfer components in the reaction centers. Based on these results we discussed the photosynthetic mechanism of this organism.