Three photosynthetic antenna porphyrins in a primitive green alga |
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Institution: | 1. Laboratoire d''Océanologie et de Géosciences (LOG), ULCO, 62930 Wimereux, France;2. Laboratoire de Toxicologie et d''Hydrologie (LTH), UCAD, 5005 Dakar, Sénégal;3. Centre Universitaire de Mesure et d''Analyse (CUMA), Université de Lille, 59006, France |
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Abstract: | Fluorescence excitation spectra (between 400–500 and 610–700 nm) for chlorophyll emission from particles and detergent extracts of the primitive green microalga, Mantoniella, were measured. The results showed that the prophyrin, magnesium 2,4-divinylpheoporphyrin a5, which this alga accumulates in addition to Chl b, also can transfer excitation energy to Chl a, and therefore act as antenna for photosynthesis. Evidence was found that magnesium 2,4-divinylpheoporphyrin a5 has a Soret band near 450 nm in vivo which further increases the light-harvesting capacity of these algae growing deep in the open ocean. |
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