Differential Response of Floating and Submerged Leaves of Longleaf Pondweed to Silver Ions.

ABSTRACT: In this study, we have investigated variations in the potential of floating and submerged leaves of longleaf pondweed (Potamogeton nodosus) to withstand silver ion (Ag⁺)-toxicity. Both floating and submerged leaves changed clear colorless AgNO₃ solutions to colloidal brown in the presence of light. Transmission electron microscopy revealed the presence of distinct crystalline Ag-nanoparticles (Ag-NPs) in these brown solutions. Powder X-ray diffraction pattern showed that Ag-NPs were composed of Ag⁰ and Ag₂O. Photosystem (PS) II efficiency of leaves declined upon exposure to Ag⁺ with a significantly higher decline in the submerged leaves than in the floating leaves. Similarly, Ag⁺ treatment caused a significant reducti

SUBMITTER: Shabnam N 

PROVIDER: S-EPMC5478881 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature