Carotenogenesis in Dunaliella cells under stressed conditions
GI Alizadeh, AR Jalilova, II Aliev, Kh Kh Magerramova
Dunaliella cells are known as carotenotransferring halotolerant green algae.In the work were presented the results of biosynthesis investigations of carotenoid amounts in Dunaliella cells, grown in mineral medium by adding 1,0M; 1,5 M and 3,0 M NaCl, their bioproductivity, culture resistance against chronic doses of UV-B rays, the influence of low temperature stress, and also their photosynthetic activity under high temperatures. It was shown that the cells, grown in intensive culture with 1,0M; 1,5M and 3,0 M NaCl in nutrition medium show various biosynthesis indications of carotenoid amounts, bioproductivity, and functional stability against high temperature. It was determined that the cells grown in medium with 3,0 M NaCl lead to the decrease of bioproductivity and increase of resistance against high temperature, related to the increase of synthesis of carotenoid amounts in cells. It has been also identified that the cells grown in medium with 1,5 МNaCI and in different chronic UV-B -rays in intensive culture increase the synthesized carotenoids and show high functional stability against high temperature. The decrease of NaCI (1,0M) concentration in nutrition medium leads to decrease of indications of biosynthesis of carotenoid amounts and growth rate to (10-15%. It was determined that low temperature stress decreases the cell bioproductivity and carotenoid amounts. One came into conclusion that, the population resistance against the chronic doses of UV-B-rays, functional stability against high temperature correlated by a number of synthesized carotenoids in those conditions.