Assessing phytotoxicity of microplastics on aquatic plants using fluorescent microplastics

Area of Science:

• Environmental Science
• Plant Biology
• Ecotoxicology

Background:

• Microplastic contamination is a growing global concern.
• Limited research exists on microplastic phytotoxicity, especially in aquatic plants.
• Understanding microplastic uptake and effects on aquatic flora is crucial.

Purpose of the Study:

• To investigate the phytotoxicity of fluorescent microplastics (FMPs) on aquatic plants.
• To assess the uptake of FMPs by Spirodela polyrhiza, Salvinia natans, and Phragmites australis.
• To provide baseline data on microplastic-plant interactions in aquatic ecosystems.

Main Methods:

• Pilot study using 1-μm-sized FMPs on three aquatic plant species.
• Applied 0.1% and 0.01% FMP treatments over three weeks.
• Verified FMP uptake via laser-induced fluorescence detection in plant tissues.

Main Results:

• Spirodela polyrhiza and Phragmites australis showed significantly decreased biomass, indicating phytotoxicity.
• Salvinia natans exhibited no significant changes in biomass or chlorophyll content.
• Fluorescence detection confirmed active FMP uptake by plant leaves, with emission spectra matching FMPs.

Conclusions:

• 1-μm FMPs demonstrate phytotoxicity towards certain aquatic plants.
• Aquatic plants are capable of actively taking up microplastics.
• This study establishes a foundation for future research on microplastic ecotoxicity in aquatic environments.