Albertano P, Barsanti L, Passarelli V, Gualtieri P
Dipartimento di Biologia, Università di Roma Tor Vergata, Italy.
Micron. 2000 Jan;31(1):27-34. doi: 10.1016/s0968-4328(99)00063-3.
Among the terrestrial epilithic cyanobacteria isolated from Roman hypogea at extremely low light intensity, a non-heterocystous strain, belonging to the genus Leptolyngbya, showed a marked photobehavior. These red cyanobacteria possess an orange spot at the tip of the apical cell. Micro-spectrophotometric analysis of this tip showed an absorption spectrum with two bands, centered at 456 and 504 nm, respectively. Experiments on photo-orientation impairment of these cells, and micro-spectrophotometric analysis of the tip of impaired trichomes showed that a rhodopsin-like protein might be present in this structure. All these data could support the hypothesis of the presence of a complex photoreceptive system in this prokaryote.
在从罗马地下洞穴极低光照强度下分离出的陆生附石蓝细菌中，一种属于细鞘丝藻属的无异形胞菌株表现出显著的光行为。这些红色蓝细菌在顶端细胞的尖端有一个橙色斑点。对该尖端进行的显微分光光度分析显示，其吸收光谱有两条带，分别以456和504纳米为中心。对这些细胞的光定向损伤实验以及对受损藻丝尖端的显微分光光度分析表明，这种结构中可能存在一种视紫红质样蛋白。所有这些数据都支持这种原核生物中存在复杂光感受系统这一假说。
