Physiochemical Responses of Two Green Algae to Transition Metals Exposure

摘要

We examined activity of external carbonic anhydrase (Cae; biochemical indicator) from alga C. Reinhardtii and the growth rate (physiological indicator) of algae C. Reinhardtii and C. Pyrenoidosa influenced by Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+ additions and relevant absorption/adsorption by these two algae on these transition metals. C. Reinhardtii has less tolerance than C. Pyrenoidosa to transition metals in toxic levels. Ni, Cu and Cd showed heavier toxicity on their growth than other transition metals. The responses of algal growths to transition metals are different due to different algal and/or transition metal species, and different absorbing quantities of relevant transition metals. Effects of these transition metals on Cae are species-specific and the magnitude in which these transition metals affect Cae depends on the concentration. Algal bio-regulation plays an important role in eliminating adverse effects of Fe and Mn on Cae, and it exits the different ways of interaction between external CA and transition metals.We examined activity of external carbonic anhydrase (Cae; biochemical indicator) from alga C. Reinhardtii and the growth rate (physiological indicator) of algae C. Reinhardtii and C. Pyrenoidosa influenced by Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+ additions and relevant absorption/adsorption by these two algae on these transition metals. C. Reinhardtii has less tolerance than C. Pyrenoidosa to transition metals in toxic levels. Ni, Cu and Cd showed heavier toxicity on their growth than other transition metals. The responses of algal growths to transition metals are different due to different algal and/or transition metal species, and different absorbing quantities of relevant transition metals. Effects of these transition metals on Cae are species-specific and the magnitude in which these transition metals affect Cae depends on the concentration. Algal bio-regulation plays an important role in eliminating adverse effects of Fe and Mn on Cae, and it exits the different ways of interaction between external CA and transition metals.