Photosynthetica 2017, 55(4):648-654 | DOI: 10.1007/s11099-016-0680-1

Assessment of cadmium phytotoxicity alleviation by silicon using chlorophyll a fluorescence

A. J. Silva1, C. W. A. Nascimento2,*, A. S. Gouveia-Neto3
1 Laboratory of Soils Remediation, Federal University of Sergipe, Sao Cristovao, Brazil
2 Laboratory of Soils Environmental Chemistry, Federal Rural University of Pernambuco, Recife, Brazil
3 Department of Physics, Federal Rural University of Pernambuco, Recife, Brazil

The aim of this study was to investigate the effects of silicon in alleviating cadmium stress in maize plants grown in a nutrient solution and to evaluate the potential of the spectral emission parameters and the ratio of red fluorescence (Fr) to far-red fluorescence (Ffr) in assessing the beneficial effects of Si. An experiment was carried out using a nutrient solution with a toxic dose of Cd and six doses of Si; biomass, Cd, Si, and photosynthetic pigments of the plants were measured. Chlorophyll (Chl) a fluorescence analysis demonstrated that Si alleviated Cd toxicity in plants. Chl fluorescence measurements were sensitive in detecting such effects even when significant changes in biomass production and concentrations of photosynthetic pigments were not observed. The spectral emission and the Fr/Ffr ratio were sensitive to the effects of Si. Silicon caused a reduction in the translocation of Cd to the shoots of maize plants.

Additional key words: metal homeostasis; metal toxicity; soil contamination; soil pollution

Received: May 9, 2016; Accepted: October 27, 2016; Published: December 1, 2017  Show citation

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Silva, A.J., Nascimento, C.W.A., & Gouveia-Neto, A.S. (2017). Assessment of cadmium phytotoxicity alleviation by silicon using chlorophyll a fluorescence. Photosynthetica, 55(4), 648-654. doi: 10.1007/s11099-016-0680-1
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