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Acta Physiologiae Plantarum

, Volume 35, Issue 4, pp 1281–1289 | Cite as

Cadmium toxicity affects photosynthesis and plant growth at different levels

  • Maria Celeste Dias
  • Cristina Monteiro
  • José Moutinho-Pereira
  • Carlos Correia
  • Berta Gonçalves
  • Conceição Santos
Original Paper

Abstract

In this article we discuss and update some of the effects of Cd toxicity on the photosynthetic apparatus in a model crop Lactuca sativa. Seeds of L. sativa were germinated in solutions with 0, 1, 10 and 50 μM of Cd(NO3)2 and then transferred to a hydroponic culture medium. After 28 days, the effects of Cd on the photosynthetic apparatus of lettuce were analysed. Exposure of lettuce to 1 μM Cd(NO3)2 affected already plant growth (dry biomass), but, did not induce serious damages in the photosynthetic apparatus. However, increasing concentrations of this metal to 10 and 50 μM promoted a strong reduction of the maximum photochemical efficiency of PSII and an impairment of net CO2 assimilation rate, putatively due to Rubisco activity decrease. This ultimately results in a strong inhibition of plant growth. Nutrient uptake and carbohydrate assimilation were also severely affected by Cd.

Keywords

Cadmium Nutrients Photosynthesis Pigments Rubisco 

Abbreviations

PN

Net CO2 assimilation rate

ci/ca

Ratio of intercellular to atmospheric CO2 concentration

Chl

Chlorophyll

DW

Dry weight

E

Transpiration rate

FW

Fresh weight

Fv/Fm

Maximal efficiency of PSII

gs

Stomatal conductance

Rubisco

Ribulose 1,5 bisphosphate carboxylase/oxygenase

RWC

Relative water content

Notes

Acknowledgments

This work was supported by the Portuguese Foundation for Science and technology (FCT) FCT/PTDC/AAC-AMB/112804/2009, BioRem: integration of multiple Biomarkers of toxicity in an assay of phytoremediation in contaminated sites. FCT also supported a post-doctoral fellowship of M. C. Dias (SFRH/BPD/41700/2007) and the doctoral fellowship of C. Monteiro (SFRH/BD/48204/2008).

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Copyright information

© Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Kraków 2012

Authors and Affiliations

  • Maria Celeste Dias
    • 1
  • Cristina Monteiro
    • 1
  • José Moutinho-Pereira
    • 2
  • Carlos Correia
    • 2
  • Berta Gonçalves
    • 2
  • Conceição Santos
    • 1
  1. 1.Department of Biology and Centre for Environmental and Marine Studies (CESAM)University of Aveiro, Campus Universitário de SantiagoAveiroPortugal
  2. 2.Department of Biology and Environment, Centre for the Research and Technology of Agro-Environmental and Biological Sciences (CITAB)University of Trás-os-Montes e Alto DouroVila RealPortugal

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