Interactive effects of solar radiation and inorganic nutrients on biofiltration, biomass production, photosynthetic activity and the accumulation of bioactive compounds in Gracilaria cornea (Rhodophyta)

Interactive effects of solar radiation and inorganic nitrogen phosphate on biofiltration capacity, biomass production, photosynthetic activity the accumulation bio-active compounds were studied in red alga Gracilaria cornea grown tanks with a seawater open-flow system during 35 days. Two light conditions utilized: outdoor (O), full natural radiation, indoor, inside greenhouse (G) where UV-B was cut-off part UV-A filtered. concentrations used: High nutrients (HN; 100–200mM NH 4 + 20mM KHPO4) Low (LN; 10–20mM 1mM KHPO4). Growth productivity related to daily integrated electron transport rate determined situ , as an estimator activity. Nitrogen uptake efficiency (NUE) close 100 % under LN, whereas HN it ranged from 50 70 first week culture, decreasing 10–15 rest experimental period. (NUR) 20 45 mmol N m −2 h −1 HN, 5 18 LN treatments. Morphological pigmentation changes evident through culture The thalli more reddish indoor treatments, than that LN. internal increased throughout Mycosporine-like amino acids (MAAs) accumulated HN. plays photoprotective role due both photosynthesis MAA content. Maximal reached 113–253 mg MAAs d O-HN treatment, highest level reported until now bibliography. G. could be used for bioremediation high content waters. In addition, availability produce levels bioactive MAAs, polyphenols biliproteins cosmeceutical applications. • is capacity ammonium biofiltration. UV supply promote mycosporine-like (MAAs). Biomass directly rates. maximal 113-253