Antibiotics impact plant traits, even at small concentrations

Area of Science:

• Environmental Science
• Plant Biology
• Ecotoxicology

Background:

• Veterinary antibiotics enter agricultural soils via animal waste.
• Previous research focused on human health impacts from consuming contaminated crops.
• Limited data exists on antibiotic effects on plant physiology, especially non-crop species.

Purpose of the Study:

• To investigate the effects of penicillin, sulfadiazine, and tetracycline on plant germination and post-germinative traits.
• To assess species-specific and functional group-specific responses to antibiotics in crop and non-crop plants.
• To determine if environmentally relevant antibiotic concentrations impact plant development.

Main Methods:

• Germination tests conducted in climate chambers.
• Post-germinative trait analysis in greenhouse experiments.
• Evaluation of four plant species (two herbs, two grasses) including crop and non-crop types.

Main Results:

• Antibiotics significantly affected plant traits, including delayed germination and development, even at low concentrations.
• Herbs were more sensitive to antibiotics than grasses.
• Penicillin and sulfadiazine generally showed stronger effects than tetracycline.
• Plant responses varied, with some showing negative and others positive effects depending on species and antibiotic.

Conclusions:

• Antibiotics from livestock impact crop species, potentially reducing yield through delayed germination and altered biomass allocation.
• Differential species-specific responses to antibiotics can alter plant community composition in field margins.
• The ecological consequences of these alterations for higher trophic levels remain unknown.