Photosynthetic behaviour of Arabidopsis plants with a Cap Binding Protein 20 mutation under water stress

R. Bacsó, A. Molnár, I. Papp, T. Janda

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Under non-stressed conditions the net photosynthetic rate (PN) of the mutant plants cbp20 of Arabidopsis was similar to that of the wild type (WT). In response to water deprivation, however, PN started to decrease later in the mutants and remained substantially higher. Thermoluminescence measurements showed that the lipid peroxidation induced by severe water stress was also less pronounced in the mutant than in the WT. Both soil gravimetric and plant water potential data showed that cbp20 mutants lose water more slowly than the WT plants. The drought-induced decline in F v/Fm, the quantum efficiency of photosystem 2, and photochemical quenching parameters also started later in the cbp20 mutants than in the WT plants. Thus the restricted gas exchange in the cbp20 mutants does not impair the photosynthetic performance of the plant; however, under drought improved water retention provides significant protection for the photosynthetic apparatus.

Original languageEnglish
Pages (from-to)268-272
Number of pages5
JournalPhotosynthetica
Volume46
Issue number2
DOIs
Publication statusPublished - Jun 1 2008

Keywords

  • Drought
  • Fluorescence induction
  • Thermoluminescence
  • Water potential

ASJC Scopus subject areas

  • Physiology
  • Plant Science

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