Chlorophyll Fluorescence Transient Analysis in Alternanthera tenella Colla Plants Grown in Nutrient Solution with Different Concentrations of Copper

Cristina C. Cuchiara, Ilda Mariclei C. Silva, Emanuela G. Martinazzo, Eugenia Jacira B. Braga, Marcos Antonio Bacarin, José Antonio Peters


This study evaluates the chlorophyll index and fluorescence parameters of chlorophyll a in Alternanthera tenella grown in different concentrations of copper (Cu). The A. tenella plants were hydroponically grown in a complete nutrient solution for 3 days and were then transferred to the same solution containing different copper concentrations [0.041, 0.082 (control), 0.164, 0.246, and 0.328 mM]. The plants were maintained in these solutions for 13 days. The nutrient solutions were replaced every 3 days, and the plants were evaluated at 6 days and 13 days after the start of the treatment. An increase in the chlorophyll index was observed at copper concentrations of 0.164, 0.246, and 0.328 mM on days 6 and 13. These concentrations of copper also affected the fluorescence parameters and caused a reduction in the pool of the final photosystem I (PSI) electron acceptors, a decrease in the total number of electron carriers per reaction centre, a decrease in the parameters related to the flow, yield, and efficiency for the reduction of the final PSI acceptor, and a decline of the total photosynthetic performance index. Therefore, high doses of copper affect the functionality of the PSI, decreasing the reduction flow of the final PSI electron acceptors.

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Journal of Agricultural Science   ISSN 1916-9752 (Print)   ISSN 1916-9760 (Online)  E-mail:

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