Decoding Ocimum basilicum L.'s Medicinal Potential Through Growth Phase Profiling: A Conservation Perspective.

Area of Science:

• Plant Science
• Pharmacognosy
• Medicinal Chemistry

Background:

• Ocimum basilicum L. (basil) essential oils (EOs) possess significant medicinal value, derived from glandular trichomes.
• Leaf growth stages critically influence plant secondary metabolite production and bioactivity.

Purpose of the Study:

• To investigate the impact of basil leaf growth phases (lag, log, stationary) on essential oil yield and pharmacological activities.
• To determine the optimal harvest stage for maximizing medicinal potential.

Main Methods:

• Microscopic analysis of trichome density and size across growth phases.
• Gas Chromatography-Mass Spectrometry (GC-MS) for essential oil profiling.
• Bioactivity assays including DPPH radical scavenging, total phenolic content, antioxidant capacity, anti-inflammatory, antidiabetic, and antimicrobial testing.

Main Results:

• Highest EO yield observed during the lag phase (1.26 mL/5 g FW).
• Stationary phase EO exhibited highest concentrations of eriodictyol and 2,5-dioxoimidazolidin-4-yl urea.
• Log phase EO showed strongest DPPH scavenging; stationary phase EO demonstrated superior antioxidant, anti-inflammatory, antidiabetic, and antimicrobial activities.

Conclusions:

• While lag phase yields more EO, the stationary phase provides superior pharmacological potential.
• The stationary growth phase is identified as the optimal harvest stage for basil medicinal applications.