Phosphorus and zinc are essential nutrients for the growth and development of algae,ex-erting significant impacts on their physiological and ecological functions.Using the diatom Thalassi-osira weissflogii as the experimental species,this study investigates the effects of varying zinc con-centrations physiological indicators such as cell density,chlorophyll a concentration,and the maxi-mum photochemical efficiency of photosystem II(Fv/Fm),as well as the maximum electron transport rate(ETRmax)where organic phosphorus is the sole phosphorus source.The results indicate that changes in zinc concentration significantly influence Thalassiosira weissflogii under organic phos-phorus conditions.Low zinc concentrations notably promote increase in cell density and chlorophyll a concentration,but have insignificant effects on Fv/Fm and ETRmax.Conversely,high zinc concentra-tions exhibit toxic effects on algal cells,inhibiting growth and reproduction,leading to substantial cell death.Additionally,in the presence of organic phosphorus presence,low zinc concentrations can promote the synthesis of alkaline phosphatase(ALP),enhancing the tolerance of algal cells to zinc concentration.However,an excess of zinc inhibits the activity of ALP.
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