Effects of ocean acidification on the growth and biochemical composition of a green alga ( Ulva fasciata ) and its associated microbiota.

Autor: Barakat KM; National Institute of Oceanography and Fisheries (NOIF), Cairo, Egypt., El-Sayed HS; National Institute of Oceanography and Fisheries (NOIF), Cairo, Egypt., Khairy HM; National Institute of Oceanography and Fisheries (NOIF), Cairo, Egypt., El-Sheikh MA; Botany & Microbiology Department, College of Science, King Saud University, Riyadh, Saudi Arabia., Al-Rashed SA; Botany & Microbiology Department, College of Science, King Saud University, Riyadh, Saudi Arabia., Arif IA; Botany & Microbiology Department, College of Science, King Saud University, Riyadh, Saudi Arabia., Elshobary ME; Botany Department, Faculty of Science, Tanta University, 31527, Tanta, Egypt.
Jazyk: angličtina
Zdroj: Saudi journal of biological sciences [Saudi J Biol Sci] 2021 Sep; Vol. 28 (9), pp. 5106-5114. Date of Electronic Publication: 2021 May 20.
DOI: 10.1016/j.sjbs.2021.05.029
Abstrakt: In marine ecosystems, fluctuations in surface-seawater carbon dioxide (CO 2 ), significantly influence the whole metabolism of marine algae, especially during the early stages of macroalgal development. In this study, the response of the green alga Ulva fasciata for elevating ocean acidification was investigated using four levels of p CO 2  ~ 280, 550, 750 and 1050 µatm. Maximum growth rate (6.6% day -1 ), protein (32.43 %DW) and pigment (2.9 mg/g) accumulation were observed at p CO 2 -550 with an increase of ~2-fold compared to control. On the other hand, lipid and carbohydrate contents recorded their maximum production (4.23 and 46.96 %DW, respectively) at p CO 2 -750 while control showed 3.70 and 42.37 %DW, respectively. SDS-PAGE showed the presence of unique bands in response to p CO 2, especially at 550 µatm. Dominant associated bacteria was shifted from Halomonas hydrothermalis of control to Vibrio toranzoniae at p CO 2 -1050. These findings suggest that ocean acidification at 550 µatm might impose noticeable effects on growth, protein, pigments, and protein profile of U. fasciata, which could be a good source for fish farming. While, p CO 2 -750 was recommended for energetic purpose, due to its high lipid and carbohydrate contents.
Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(© 2021 The Authors.)
Databáze: MEDLINE
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