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.
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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
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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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Dias, M.C., Monteiro, C., Moutinho-Pereira, J. et al. Cadmium toxicity affects photosynthesis and plant growth at different levels. Acta Physiol Plant 35, 1281–1289 (2013). https://doi.org/10.1007/s11738-012-1167-8
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DOI: https://doi.org/10.1007/s11738-012-1167-8