Effects of blue light on the biochemical composition and photosynthetic activity of Isochrysis sp. (T-iso)
|Author(s)||Marchetti Julie1, Bougaran Gael1, Jauffrais Thierry1, Lefebvre Sebastien2, Rouxel Catherine1, Saint-Jean Bruno1, Lukomska Ewa1, Robert Rene3, Cadoret Jean-Paul1|
|Affiliation(s)||1 : IFREMER, Lab Physiol & Biotechnol Algues, F-44311 Nantes 3, France.
2 : Univ Lille 1, LOG, CNRS, Stn Marine Wimereux,UMR 8187, F-62930 Wimereux, France.
3 : IFREMER, Lab Physiol & Ecophysiol Mollusques Marins, Stn Expt Argenton, F-29840 Argenton En Landunvez, France.
|Source||Journal Of Applied Phycology (0921-8971) (Springer), 2013-02 , Vol. 25 , N. 1 , P. 109-119|
|WOS© Times Cited||44|
|Keyword(s)||Isochrysis, Blue light, Photosynthesis, Proximate composition, Chemostat|
|Abstract||In aquaculture, particularly in bivalve hatcheries, the biochemical composition of algal diets has a strong influence on larval and post-larval development. Biochemical composition is known to be related to culture conditions, among which light represents a major source of variation. The effects of blue light on biochemical composition and photosynthetic rate of Isochrysis sp. (T-iso) CCAP 927/14 were assessed in chemostat at a single irradiance (300 μmol photons m−2 s−1) and compared with white light. Two different dilution (renewal) rates were also tested: 0.7 and 0.2 d−1. Relative carbohydrate content was lower under blue light than under white light at both dilution rates, whereas chlorophyll a and photosynthesis activity were higher. In contrast, carbon quota was lower and protein content higher under blue light than under white light, but only at 0.7 d−1. Despite these metabolic differences, cell productivity was not significantly affected by the spectrum. However, the nitrogen to carbon ratio and photosynthetic activity were higher at 0.7 d−1 than at 0.2 d−1, while carbon quota and carbohydrate content were lower. Our results show that blue light may influence microalgal metabolism without reducing productivity for a given growth rate, a result that should be of great interest for microalgal production in aquaculture.|