Effects of ocean acidification and Cu2+on the growth and photosynthetic performance of Phaeodactylum tricornutum
ZHAO Lu
ZHONG Zhihai
YANG Jianchao
GU Chengbai
Abstract：Effects of Cu2+and ocean acidification on the photosynthesis of Phaeodactylum tricornutum have been widely studied,but the studies on their coupling effects are less.The effects of different CO2 concentration(400 and 1500 μatm CO2)on the specific growth rate(μ),photosynthetic pigment content and photosynthetic performance of P.tricornutum under different Cu2+concentrations(0.1,0.25,0.5 mgL1Cu2+)were measured.The results showed that the μ,photosynthetic pigment(chlo-rophyll A and C)content,maximum photochemical quantum yield(Fv/Fm),maximum relative elec-tron transfer rate(rETRmax),energy captured per unit reaction center for electron transfer(ETo/RC)and energy captured per unit reaction center for electron transfer to the PSI electron acceptor side(REo/RC)were inhibited by 0.5 mgL-1 Cu2+under 400 μatm CO2 condition,respectively.These pa-rameters were significantly lower than those at 1,500 μatm CO2(p＜0.05),respectively.Our findings suggested that high concentrations of Cu2+not only restricted the growth of P.trichodensis but also inhibited the activity of photosystem Ⅱ(PSⅡ)while ocean acidification alleviated the these inhibitions.In the coastal waters where ocean acidification and heavy metal pollution are more serious,ocean a-cidification could improve the tolerance of P.tricornutum to Cu2+and assist it to survive the complex and changeable environment.
Keywords：electron transport ratemetal pollutionocean acidificationphotosynthesisPhaeodacty-lum tricornutum
Publication Date：2025-02-28
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：8( 88-95 )