Inhibition of quantum yield of PS II electron transport in Spirulina platensis by osmotic stress may be explained mainly by an increase in the proportion of the Q(B)-non-reducing PS II reaction centres

Congming Lu, Jianhua ZHANG*, Avigad Vonshak

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

15 Citations (Scopus)

Abstract

Modulated chlorophyll fluorescence and fluorescence induction kinetics were used to evaluate the PS II photochemistry in Spirulina platensis exposed to osmotic stress (0-0.8 M mannitol). Osmotic stress decreased the efficiency of excitation energy capture by open PS II reaction centres F(v)'/F(m)') and more significantly, decreased photochemical quenching (q(p)). Osmotic stress also decreased the maximal efficiency of PS II photochemistry (F(v)/F(m)). There was no significant change in non-photochemical quenching (q(N)), indicating that the decreased F(v)'/F(m)' was not due to an increase in q(N). Analyses of the fast fluorescence induction kinetics indicated that osmotic stress caused a significant increase in the proportion of the QB-non-reducing PS II reaction centres. Based on the results in this study, we suggest that a substantial increase in the proportion of the QB-non-reducing PS II reaction centres may be responsible for the decrease in q(p) and F(v)'/F(m)', of which both resulted in the decrease in the quantum yield of PS II electron transport (Φ(PS II)).

Original languageEnglish
Pages (from-to)689-694
Number of pages6
JournalAustralian Journal of Plant Physiology
Volume25
Issue number6
DOIs
Publication statusPublished - 1998

Scopus Subject Areas

  • Agricultural and Biological Sciences(all)

User-Defined Keywords

  • Chlorophyll fluorescence
  • Cyanobacterium
  • Osmotic stress
  • PS II
  • Q(B)-non-reducing PS II reaction centres
  • Spirulina platensis

Fingerprint

Dive into the research topics of 'Inhibition of quantum yield of PS II electron transport in Spirulina platensis by osmotic stress may be explained mainly by an increase in the proportion of the Q(B)-non-reducing PS II reaction centres'. Together they form a unique fingerprint.

Cite this