Volatile terpenes, synthesis

There are very few reports of cases when indirect defense function of volatile terpenes has changed under climate change factors. Elevating temperature may increase the volatility of herbivore-induced terpenes, but not necessary their synthesis. If carbon is allocated more to terpenoids and isoprenes to mitigate temperature stress, their overproduction could negatively affect induction of sesquiterpenes and homoterpenes, and even result in reduced indirect defense. 

Citral, a fragrant terpene aldehyde made up of two isoprene units, is the main component of the steam-volatile fraction of lemon grass oil and is used in a commercial synthesis of vitamin A. 

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