Photosynthesis Research

, Volume 125, Issue 1, pp 291–303

Cadmium accumulation in chloroplasts and its impact on chloroplastic processes in barley and maize

  • Eugene A. Lysenko
  • Alexander A. Klaus
  • Natallia L. Pshybytko
  • Victor V. Kusnetsov
Regular Paper

DOI: 10.1007/s11120-014-0047-z

Cite this article as:
Lysenko, E.A., Klaus, A.A., Pshybytko, N.L. et al. Photosynth Res (2015) 125: 291. doi:10.1007/s11120-014-0047-z

Abstract

Data on cadmium accumulation in chloroplasts of terrestrial plants are scarce and contradictory. We introduced CdSO4 in hydroponic media to the final concentrations 80 and 250 μM and studied the accumulation of Cd in chloroplasts of Hordeum vulgare and Zea mays. Barley accumulated more Cd in the chloroplasts as compared to maize, whereas in the leaves cadmium accumulation was higher in maize. The cadmium content in the chloroplasts of two species varied from 49 to 171 ng Cd/mg chlorophyll, which corresponds to one Cd atom per 728–2,540 chlorophyll molecules. Therefore, Mg2+ can be substituted by Cd2+ in a negligible amount of antenna chlorophylls only. The percentage of chloroplastic cadmium can be estimated as 0.21–1.32 % of all the Cd in a leaf. Photochemistry (Fv/Fm, ΦPSII, qP) was not influenced by Cd. Non-photochemical quenching of chlorophyll-excited state (NPQ) was greatly reduced in barley but not in maize. The decrease in NPQ was due to its fast relaxing component; the slow relaxing component rose slightly. In chloroplasts, Cd did not affect mRNA levels, but content of some photosynthetic proteins was reduced: slightly in the leaves of barley and heavily in the leaves of maize. In all analyzed C3-species, the effect of Cd on the content of photosynthetic proteins was mild or absent. This is most likely the first evidence of severe reduction of photosynthetic proteins in leaves of a Cd-treated C4-plant.

Keywords

Cadmium Chloroplasts mRNA Proteins Barley Maize Photosystem II activity 

Abbreviations

BEP clade

Main branch of Poaceae family that includes subfamilies Bambusoideae, Ehrhatoideae, Pooideae

Car

Carotenoids

Chl

Chlorophyll

ETR

Coefficient of electron-transport rate

DW

Dry weight

F0

Minimum Chl a fluorescence in the dark-adapted state

Fm

Maximum Chl a fluorescence

Fv/Fm

Maximum quantum yield of PSII

FW

Fresh weight

HM

Heavy metal

LS, SS

Large or small subunits of Rubisco

NPQ

Coefficient of non-photochemical quenching of excited Chl state

PACMAD clade

Main branch of Poaceae family that includes subfamilies Panicoideae, Aristidoideae, Chloridoideae, Micrairoideae, Arundinideae, Danthonioideae

PBS

Phosphate buffer saline

PEPC

Phosphoenolpyruvate carboxylase

PSI

Photosystems I

PSII

Photosystems II

qE

Fast relaxing component of NPQ (energy/ΔpH dependent)

qI

Slow relaxing component of NPQ (dependent mainly on photoinhibition)

qP

Coefficient of photochemical quenching of excited Chl state

qN

Coefficient of non-photochemical quenching of excited Chl state

SDS-PAGE

Sodium dodecylsulfate polyacrylamide gel electrophoresis

ΦPSII

Effective quantum yield of PSII

Supplementary material

11120_2014_47_MOESM1_ESM.pdf (106 kb)
Supplementary material 1 (PDF 105 kb)

Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Eugene A. Lysenko
    • 1
  • Alexander A. Klaus
    • 1
  • Natallia L. Pshybytko
    • 2
  • Victor V. Kusnetsov
    • 1
  1. 1.Timiryazev Institute of Plant Physiology, RASMoscowRussia
  2. 2.Institute of Biophysics and Cell Engineering, NASBMinskBelarus

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