HPLC identification of allelopathic compounds fromLantana camara

Area of Science:

• Plant Science
• Agroecology
• Phytochemistry

Background:

• Lantana camara L. is an invasive plant species with known allelopathic properties.
• Understanding its phytotoxicity is crucial for managing its spread and potential agricultural impact.

Purpose of the Study:

• To investigate the phytotoxicity of aqueous Lantana camara leaf extracts on ryegrass (Lolium multiflorum Lam.).
• To identify and characterize the specific compounds responsible for the observed phytotoxic effects.

Main Methods:

• Aqueous extracts of Lantana camara leaves were prepared.
• Crude extracts were fractionated, and fractions were evaluated for phytotoxicity.
• High-performance liquid chromatography (HPLC) was used for compound identification.
• Ryegrass germination and seedling growth (radicle and shoot elongation) were measured.

Main Results:

• Aqueous Lantana camara extracts significantly inhibited ryegrass germination and seedling growth.
• Alkaline and acid hydrolysates showed the most pronounced inhibitory effects.
• HPLC analysis identified thirteen phenolic compounds, most of which exhibited phytotoxicity.
• Radicle elongation was found to be more sensitive to the phytotoxins than shoot elongation.

Conclusions:

• Lantana camara leaf extracts contain complex mixtures of phytotoxic compounds, primarily phenolics.
• These compounds contribute to the allelopathic potential of Lantana camara, impacting ryegrass.
• Further research into specific compound mechanisms could inform weed management strategies.