Which type of plastids are believed to be required for monoterpene synthesis?

Leucoplasts are required for monoterpene synthesis. Monoterpenes are terpenes, a class of organic compounds, produced by a variety of plants, particularly conifers. Leucoplasts contain droplets of lipid-like material at their margins leading to the belief that these organelles are involved in monoterpene synthesis. Leucoplasts contain enzymes of the monoterpene pathway, thus they might be involved in monoterpene synthesis.