Nematicidal triterpenoids from Lantana camara

Area of Science:

• Phytochemistry
• Natural Products Chemistry
• Agricultural Entomology

Background:

• Lantana camara is a plant species known for its diverse phytochemical constituents.
• Root knot nematodes (Meloidogyne incognita) cause significant damage to agricultural crops worldwide.
• There is a continuous need for effective and potentially safer alternatives to synthetic pesticides for nematode control.

Purpose of the Study:

• To isolate and identify triterpenes from Lantana camara.
• To evaluate the nematicidal activity of isolated compounds against Meloidogyne incognita.
• To identify potential natural nematicides for agricultural applications.

Main Methods:

• Bioassay-guided isolation of compounds from the aerial parts of Lantana camara.
• Chemical characterization of isolated triterpenes, including a new compound, lancamarolide.
• Nematicidal activity assays against Meloidogyne incognita at varying concentrations and time points.

Main Results:

• A new triterpene, lancamarolide, and seven known triterpenes were isolated.
• Oleanonic acid exhibited the highest nematicidal activity, causing 80% mortality of Meloidogyne incognita after 72 hours at 0.0625% concentration.
• The activity of oleanonic acid was comparable to the synthetic standard, furadan.

Conclusions:

• Oleanonic acid is a potent natural nematicide with potential for agricultural use.
• Lantana camara serves as a valuable source of bioactive compounds for pest management.
• Further research into the mechanism of action and field application of oleanonic acid is warranted.