Inhibition of photosynthesis and energy dissipation induced by water and high light stresses in rice

Yanhong Zhou, Hon Ming Lam, Jianhua ZHANG*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

153 Citations (Scopus)

Abstract

Photoprotection mechanisms of rice plants were studied when its seedlings were subjected to the combined stress of water and high light. The imposition of water stress, induced by PEG 6000 which was applied to roots, resulted in substantial inhibition of stomatal conductance and net photosynthesis under all irradiance treatments. Under high light stress, the rapid decline of photosynthesis with the development of water stress was accompanied by decreases in the maximum velocity of RuBP carboxylation by Rubisco (Vcmax), the capacity for ribulose-1,5-bisphosphate regeneration (Jmax), Rubisco and stromal FBPase activities, and the quantum efficiency of photosystem II, in the absence of any stomatal limitation of CO2 supply. Water stress significantly reduced the energy flux via linear electron transport (JPSII), but increased light-dependent and ΔpH- and xanthophyll-mediated thermal dissipation (JNPQ). It is concluded that the drought-induced inhibition of photosynthesis under different irradiances in the rice was due to both diffusive and metabolic limitations. Metabolic limitation of photosynthesis may be related to the adverse effects of some metabolic processes and the oxidative damage to the chloroplast. Meanwhile, an enhanced thermal dissipation is an important process to minimize the adverse effects of drought and high irradiance when CO2 assimilation is suppressed.

Original languageEnglish
Pages (from-to)1207-1217
Number of pages11
JournalJournal of Experimental Botany
Volume58
Issue number5
DOIs
Publication statusPublished - Mar 2007

Scopus Subject Areas

  • Physiology
  • Plant Science

User-Defined Keywords

  • Light stress
  • Oryza sativa
  • Photoinhibition
  • Photoprotection
  • Photosynthesis
  • Rice
  • Water stress

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