Optimizing Allelopathy Screening Bioassays by Using Nano Silver

Area of Science:

• Agricultural Science
• Nanotechnology
• Plant Science

Background:

• Nano solutions are increasingly utilized in medicine and show potential for allelopathy screening.
• Colloidal nano silver (Silver-Amber©) with 20 nm nanoparticles (purity 99.99%) was investigated for its role as an allelochemical carrier.

Purpose of the Study:

• To evaluate the effectiveness of nano silver as a carrier for allelochemicals in laboratory settings.
• To determine the influence of various concentrations of Silver-Amber© on the germination and initial development of *Lactuca sativa* L.

Main Methods:

• *Lactuca sativa* L. seeds were exposed to eleven concentrations of Silver-Amber© (0.10% to 100.0% v/v) in a 0.75% agar medium.
• Seed germination percentage, germination index, and initial plant growth parameters were measured.

Main Results:

• Increasing concentrations of Silver-Amber© demonstrated a dose-dependent inhibitory effect on seed germination (37.8% to 94.3%) and plant growth (54.0% to 98.9%).
• Low concentrations (0.04 to 0.63 ppm) exhibited an indifferent to a statistically unproven stimulatory effect on *L. sativa* germination and development (GI 88.7-94.6%).

Conclusions:

• Nano silver, specifically Silver-Amber©, can be effectively employed as a carrier for allelochemicals in laboratory-based allelopathic studies.
• The concentration of nano silver is critical, as higher levels inhibit plant development while very low levels may offer a mild stimulatory effect.