The Aerobic anoxygenic phototrophic bacteria (AAPB) Roseobacter denitrificans and Roseobacter litoralis are widespread in the bacterioplankton community with a particular role in the marine carbon cycle. Measurements of carotenoids isolated from dark-grown cells indicated the presence of spheroidenone (SO, N = 11) and of 3,4 dihydrospheroidenone (N = 10) in the carotenoids isolated from illuminated cells. Time-dependent Raman 514 nm excitation experiments of R. denitrificans and R. litoralis cells grown under illumination demonstrated that v₁ (C=C) of SO exhibits a time-dependent substantial frequency upshift relative to its frequency in the dark-grown cells, in a manner resembling shorting the conjugation length (N). We suggest that the irreversible dark-SO to light- 3,4 dihydrospheroidenone transition observed in the intact carotenoids of R. denitrificans and R. litoralis cells is an operative photoreduction strategy of SO containing AAPB that affects the energy transfer mechanism.

好氧产氧光养细菌（AAPB）的反硝化玫瑰杆菌和立花玫瑰杆菌在浮游植物群落中广泛分布，在海洋碳循环中具有特殊作用。从暗生长的细胞中分离出的类胡萝卜素的测量结果表明， 从照射的细胞中分离出的类胡萝卜素中存在类球体酮（SO，N  = 11）和3,4二氢类球体酮（N = 10）。在光照下生长的反硝化R. litoralis细胞和litoralis细胞的时间依赖性拉曼514 nm激发实验表明，v ₁SO（C = C）在黑暗生长的细胞中相对于其频率表现出随时间变化的基本频率上移，类似于缩短共轭长度（N）。我们建议，不可逆的暗-SO到的完整的类胡萝卜素观察光3,4- dihydrospheroidenone过渡R.脱氮和R. litoralis的细胞是含有AAPB SO的影响该能量传递机构的操作性光还原策略。