Premium
The effect of salinity shock on the growth and rapid light curve of dunaliella salina
Author(s) -
Qin Ruiyang,
Li Yongfu,
Zhang Litao,
Liu Jianguo
Publication year - 2021
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.15105
Subject(s) - dunaliella salina , salinity , dunaliella , biology , glycerol , photosynthesis , carotenoid , botany , food science , biochemistry , algae , ecology
To confirm the effect of hypersaline shock on the growth of Dunaliella salina , the rapid light curves and chlorophyll fluorescence in D . salina with a NaCl upshift from 80 to 160, 240 and 320 g·L −1 , respectively, were measured. Results showed that the photosynthetical saturated light of Dunaliella salina was downregulated to deal effectively with the severe NaCl increase from 80 to 160, 240 and 320 g·L −1 . Dunaliella salina can deal effectively with the cells’ rapid increase in NaCl from 80 to 160 g·L −1 by heat dissipation to dissipate the excess energy. Salinity with 240–320 g·L −1 NaCl led to overproduction of Q A − and the destruction of the PSII acceptor side, causing inhibition of photosynthetic electron transport. Dunaliella salina can also manage the abrupt rise in NaCl concentration from 80 to 240 g·L −1 by accumulating the amount of β‐carotene and glycerol per cell. However, Dunaliella salina cannot effectively manage the rapid increase in NaCl from 80 to 320 g·L −1 due to the stronger inhibition and impaired of the PSII acceptor side. It is suitable to shade D . salina cells to 500 and 800 μmol·m −2 ·s −1 when cells are exposed to a severe NaCl shift from 80 to 160 g·L −1 and 80 to 240 g·L −1 . NaCl ranged from 80 to 240 g·L −1 favoured the growth and carotenoid content of D . salina ; however, the survival rate and photosynthetic activity were lowered by the sudden increase in NaCl.