Abstract: In order to investigate the impacts of ocean acidification and different concentrations of Fe ion on the photosynthetic process of alga Skeletonemacostatum, the chlorophyll fluorescence parameters of PSⅡ were measured in the alga cultured at initial density of 5×105 cells/L in the medium simulating acidification induced by CO2 concentration of 0.038%(control group)and containing Fe(Ⅲ)concentrations of 1.5, 2.0，3.0, and 4.0 μg/L prepared by FeCl3·6H2O at temperature of(22±2)℃.It was found that the cell densities of the alga in both 1.5 and 2.0 μg/L Fe(Ⅲ)in the CO2 0.038% groups and 3.0 and 4.0 μg/L Fe(Ⅲ)in the CO2 0.08% groups were in the same level and promoted significantly(P<0.05).Fv/Fm, ΦPSⅡ, yield and rETR of the alga photosynthetic process were significantly affected by CO2 induced acidification, the concentration of Fe(Ⅲ)and their interaction(P<0.05).There were significantly lower 4 parameters above in the 1.5 and 2.0 μg/L Fe(Ⅲ)groups, and CO2 0.08% treatment group than those in CO2 0.038% treatment group(P<0.05), without significant differences in fluorescence parameters of PSⅡ in the 3.0 μg/L group and 4.0 μg/L Fe(Ⅲ)group between CO2 0.08% group and CO2 0.038% group.The findings indicated that CO2 induced acidification did not promote the growth of the alga significantly when CO2 content was increased to 0.08% for the algae needed high Fe(Ⅲ)concentration to maintain the growth level at current CO2 concentration of 0.038%.
张达娟, 毕相东, 张树林, 戴伟, 王雪莹. 海水酸化和铁离子对中肋骨条藻光化学活性的影响[J]. 大连海洋大学学报, 2022, 37(2): 244-250.
ZHANG Dajuan, BI Xiangdong, ZHANG Shulin, DAI Wei, WANG Xueying. Effects of ocean acidification and Fe ion on photochemical activity of alga Skeletonema costatum. Journal of Dalian Ocean University, 2022, 37(2): 244-250.
2022, Vol. 37 
