Thermostability of photosystem II is increased in salt-stressed sorghum

Congming Lu, Jianhua ZHANG*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

53 Citations (Scopus)


Modulated chlorophyll fluorescence and rapid fluorescence induction kinetics were used to evaluate the functions of photosystem II (PSII) photochemistry in sorghum leaves exposed to salinity (0-100 mM NaCl) and/or high temperature stress (30-50°C). No differences were detected in the steadystate fluorescence parameters and rapid fluorescence induction kinetics in salt-stressed leaves, indicating that PSII was highly resistant to salinity stress alone. However, salinity stress modified the responses of PSII to high temperature. When the temperature was above 45°C, the thermostability of PSII was strongly enhanced in salt-stressed leaves, which was reflected in a smaller decrease in maximum efficiency of PSII photochemistry, coefficients of photochemical and non-photochemical quenching, and efficiency of excitation capture by open PSII reaction centres, and in a smaller increase in the proportion of the Q(B)-non-reducing PSII centres in salt-stressed leaves than in control leaves. This increased thermostability in salt-stressed leaves exposed to high temperature seemed to be independent of the imposed salt concentration since there were no significant variations in the above fluorescence parameters among the salt-stressed plants treated with different salt concentrations. The results are discussed in terms of the physiological significance of such increased resistance of PSII to high temperature.

Original languageEnglish
Pages (from-to)317-324
Number of pages8
JournalAustralian Journal of Plant Physiology
Issue number3
Publication statusPublished - 1998

Scopus Subject Areas

  • Agricultural and Biological Sciences(all)

User-Defined Keywords

  • Chlorophyll fluorescence
  • Heat stress
  • Photosystem II
  • Salt stress
  • Sorghum (Sorghum bicolor L.)
  • Thermostability of photosystem II


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