Myrcene Limonene Plasticity

Myrcene-limonene plasticity describes genetic systems where both sesquiterpene myrcene and monoterpene limonene expression shift significantly across growing conditions, phenotypes, and harvest timing. Plants carrying this trait often show variable ratios between earthy-herbal (myrcene-dominant) and bright-citrus (limonene-dominant) aromatic profiles, even within the same line. This phenotypic flexibility is frequently observed in hybrid cultivars and accessions with complex terpene synthase gene backgrounds. The ratio shift can correlate with nutrient availability, light spectrum, temperature stress, and maturation stage, making it valuable for understanding terpene stability in breeding programs.

Breeders working with plasticity traits study myrcene-limonene ratios to identify stable versus environmentally responsive genotypes, informing decisions about cultivation standardization and phenotype selection. Lines exhibiting this plasticity provide experimental models for investigating terpene regulation without relying on external chemical additives.