β-carotene synthesis in spirulina biomass during the cultivation at illumination stress conditions
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2020-03-28 11:44
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RUDIC, Valeriu; RUDI, Ludmila; CHIRIAC, Tatiana; CEPOI, Liliana; MISCU, Vera; CODREANU, Svetlana; IATSCO, Iulia; SADOVNIC, Daniela; GHELBET, Viorica; VALUŢĂ, Ana; DONI, Veronica; CIOBAN, Mihaela. β-carotene synthesis in spirulina biomass during the cultivation at illumination stress conditions. In: Microbial Biotechnology. Ediția 3, 12-13 octombrie 2016, Chișinău. Chișinău, Republica Moldova: Institutul de Microbiologie şi Biotehnologie, 2016, p. 183.
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Microbial Biotechnology
Ediția 3, 2016
Conferința "Microbial Biotechnology"
Chișinău, Moldova, 12-13 octombrie 2016

β-carotene synthesis in spirulina biomass during the cultivation at illumination stress conditions


Pag. 183-183

Rudic Valeriu, Rudi Ludmila, Chiriac Tatiana, Cepoi Liliana, Miscu Vera, Codreanu Svetlana, Iatsco Iulia, Sadovnic Daniela, Ghelbet Viorica, Valuţă Ana, Doni Veronica, Cioban Mihaela
 
Institute of Microbiology and Biotechnology of the ASM
 
Disponibil în IBN: 15 martie 2019



Teza

Spirulina platensis strain CNMN-CB-11 was grown under standard conditions of continuous illumination. On day 3 of the cultivation cycle, spirulina has been subjected to stress by reducing the illumination period to 4 hours. These conditions were followed until day 7 of cultivation, when the lighting regime was restored and maintained until day 10 of the experimental cycle. The synthesis of beta-carotene reacted quickly to changing the lighting regime. On the first day of light stress, carotene content was reduced by 15% compared to the carotene in spirulina biomass grown under standard conditions. On the second day of light-induced stress, the carotenoid content was reduced by 21% maximum. The variations in the carotene values of spirulina biomass in both experimental variants are identical in the first 6 days of cultivation, even under conditions of induced stress. On day 7 of the cultivation cycle (which corresponds to the first day of returning to the normal thermal regimen), the carotene content in the control variant decreased by 25% compared to the previous day and the carotene content in the experimental variant with restored lighting regime increased by 23%. Thus, in spirulina biomass subjected for four days to light stress, the return to the normal illumination induces the synthesis of carotene, which exceeds by 26% its content in spirulina biomass, grown under optimal standard conditions. The next two days of cultivation, carotene content increased in both experimental variants, but remains higher by 15% in case of induced stress conditions. Therefore, light stress, which reduces carotene synthesis into spirulina biomass, induces its synthesis in case of the return to the normal lighting regime.