Abstract
Arsenic is a critical contaminant that is released into the environment through geochemical processes and anthropic actions. Two independent hydroponic experiments were performed to evaluate the ecophysiological responses of water hyacinth [Eichhornia crassipes (Mart.) Solms] to As under various stress conditions. In experiment 1, water hyacinth was exposed to As5+ at concentrations of 0, 0.2, 2.0, and 20 mg L−1 for 0, 2, and 4 d; in experiment 2, water hyacinth was exposed at concentrations of 0, 0.025, 0.05, and 0.1 mg L−1 for 0, 10, and 20 d. In both experiments, As accumulation in plant tissue was proportional to its increase in the nutrient solution; As concentrations were higher in roots than in shoots. Detrimental effects of As on gas exchange were observed and were more pronounced in experiment 1. In experiment 1, at the beginning on the second day of exposure, significant decreases of maximum photochemical efficiency of PSII (Fv/Fm), variable chlorophyll fluorescence (Fv/F0), and photosynthetic pigment contents were observed in plants exposed to 2.0 and 20 mg(As5+) L−1. It indicated that damage to the photosynthetic apparatus had occurred. No changes in Fv/Fm, Fv/F0, and contents of photosynthetic pigments were observed in the plants grown in the presence of 0.2 mg(As5+) L−1 (in experiment 1) or after any of the treatments in experiment 2, indicating plant tolerance. Elevated nonphotochemical quenching was observed in experiment 2 after 20 d of exposure to As; it was as a part of protection mechanisms of the photosynthetic apparatus in these plants. The results obtained here indicate that the use of water hyacinth for As5+ removal from highly impacted environments is limited but that it is effective in remediating sites with a low contamination.
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Abbreviations
- Car:
-
carotenoids
- Chl:
-
chlorophyll
- C i :
-
intercellular CO2 concentration
- DMSO:
-
dimethylsulfoxide
- F0 :
-
minimal fluorescence yield of the dark-adapted state
- Fm :
-
maximal fluorescence yield of the dark-adapted state
- Fv :
-
variable fluorescence
- Fv/F0 :
-
variable chlorophyll fluorescence
- Fv/Fm :
-
maximum photochemical efficiency of PSII
- g s :
-
stomatal conductance
- NPQ:
-
nonphotochemical quenching
- P N :
-
net photosynthetic rate
- qP :
-
photochemical quenching
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Acknowledgements: The authors wish to thank the Coordination for the Improvement of Higher Education Personnel (CAPES), Research Foundation for the State of the Rio de Janeiro (FAPERJ), and the State University of the North Fluminense Darcy Ribeiro for financial support.
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Meneguelli-Souza, A.C., Vitória, A.P., Vieira, T.O. et al. Ecophysiological responses of Eichhornia crassipes (Mart.) Solms to As5+ under different stress conditions. Photosynthetica 54, 243–250 (2016). https://doi.org/10.1007/s11099-015-0174-6
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DOI: https://doi.org/10.1007/s11099-015-0174-6