Istituto di Biofisica     
Albertano P., Barsanti L., Passarelli V., Gualtieri P. A complex photoreceptive structure in the cyanobacterium Leptolyngbya sp. In: Micron, vol. 31 (1) pp. 27 - 34. Elsevier, 2000.
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.
DOI: 10.1016/S0968-4328(99)00063-3
Subject Cyanobacteria
Rhodopsin-like protein

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