Copper-induced inhibition of PSII photochemistry in cyanobacterium Spirulina platensis is stimulated by light

Cong Ming Lu, Jianhua ZHANG*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

9 Citations (Scopus)


The role of light in the modifications of copper toxicity on PSII photochemistry in Spirulina platensis was investigated in vivo by use of chlorophyll fluorescence. The results demonstrated that copper (up to 300 mmol m-3) substantially inhibited PSII photochemistry in the light but exhibited no significant effects on PSII photochemistry when the cells were incubated in the dark for 12 h. Moreover, the higher the light intensity, the more significant effect the copper treatment induced. It was found that copper inhibited PSII photochemistry, which was linked to the reduction of Q(A). Copper also decreased the proportion of the active PSII reaction centers, but showed no effects on the proportion of Q(B)-non-reducing PSII reaction centers. The results on PSII photochemistry under the steady state of photosynthesis demonstrated that copper induced an increase in the non-photochemical quenching while it resulted in a decrease in the photochemical quenching and the efficiency of energy excitation capture by open PSII reaction centers, of which both resulted in a decrease in the quantum yield of PSII electron transport.

Original languageEnglish
Pages (from-to)173-178
Number of pages6
JournalJournal of Plant Physiology
Issue number2
Publication statusPublished - Feb 1999

Scopus Subject Areas

  • Physiology
  • Agronomy and Crop Science
  • Plant Science

User-Defined Keywords

  • Chlorophyll fluorescence
  • Copper toxicity
  • Light intensity
  • PSII photochemistry
  • Spirulina platensis (cyanobacterium)


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