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Assaying Predatory Feeding Behaviors in Pristionchus and Other Nematodes

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Chemical and Morphometrical Comparison Between two Peppermint Notomorphs.

M Maffei¹, T Sacco

¹Istituto di Botanica Speciale, Facoltà di Medicina Veterinaria dell'Università di Torino, Viale Mattioli 25,I-10125 Turin, Italy.

|April 1, 1987

Summary

This study compared two peppermint (Mentha) notomorphs, revealing differences in glandular trichome density and oil composition. M. RUBESCENS exhibited higher trichome counts and distinct essential oil profiles in flowers and leaves.

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Area of Science:

Botany
Pharmacognosy
Plant Science

Background:

Peppermint (Mentha) comprises various notomorphs with potentially differing phytochemical profiles.
Glandular trichomes are key sites for essential oil production in mint species.

Purpose of the Study:

To compare morphometrical data of glandular trichomes and essential oil composition between two peppermint notomorphs, Mentha PALLESCENS and Mentha RUBESCENS.
To investigate the correlation between trichome density and essential oil yield.

Main Methods:

Collection and analysis of flowers and leaves from M. PALLESCENS and M. RUBESCENS.
Glandular trichome counting using scanning electron microscopy (SEM).
Essential oil analysis via gas chromatography-mass spectrometry (GC-MS).

Main Results:

M. RUBESCENS showed significantly higher trichome density and number compared to M. PALLESCENS.
A positive correlation was observed between leaf trichome number and essential oil yield.
Distinct chemical profiles were identified: M. RUBESCENS flowers were rich in menthol, menthone, and menthofuran, while M. PALLESCENS leaves had high menthyl acetate and moderate menthol.

Conclusions:

Morphological variations in trichomes influence essential oil production and composition in peppermint notomorphs.
The chemotype of peppermint is significantly influenced by its notomorph and plant part (flower vs. leaf).