Changes in the photosynthetic apparatus of broad bean leaves as dependent on the content of heavy metals in the growth medium

V. A. Karavaev, A. M. Baulin, T. V. Gordienko, S. A. Dovyd'kov, A. N. Tikhonov

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18 Citations (Scopus)

Abstract

The content of chlorophyll, the rate of O2 evolution, the slow phase of fluorescence induction, and photoinduced changes in the intensity of electron paramagnetic resonance (EPR) signal I from the reaction center of photosystem I (P+700) were studied in leaves of Vicia faba L. grown in 10-7-10-3 M aqueous solutions of CdCl2, SnCl2, CuCl2, and MgCl2. At low concentrations of heavy metal (Cd, Sn, and Cu) chlorides, the content of chlorophyll per fresh weight decreased. However, the rate of O2 evolution calculated per chlorophyll basis, ΔO2/(Δt chlorophyll), increased. High concentrations of heavy metals significantly suppressed plant development and inhibited photosynthetic O2 evolution. In contrast, plant treatment with MgCl2 (10-5-10-3 M) resulted in an increase in the content of chlorophyll and a stimulation of leaf photosynthetic activity. A positive correlation between the FM/FT ratio and ΔO2/(Δt chlorophyll) (r = 0.89, P > 0.999) was found. We observed a negative correlation between the values of P/P0 of EPR signal I (white/far-red light) and ΔO2(Δt chlorophyll) (r = -0.89, P > 0.999). The data obtained indicate nonspecific and nonmonotone changes in the photosynthetic apparatus of plants treated with heavy metals: low concentrations of heavy metals (10-7-10-6 M) stimulated photosynthetic activity, whereas high concentrations (10-4-10-3 M) suppressed it.

Original languageEnglish
Pages (from-to)38-44
Number of pages7
JournalRussian Journal of Plant Physiology
Volume48
Issue number1
DOIs
Publication statusPublished - Jan 1 2001
Externally publishedYes

Keywords

  • Chlorophyll fluorescence
  • EPR signal
  • Heavy metals
  • Vicia faba

ASJC Scopus subject areas

  • Plant Science

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