Smell You Later: World's Most Spoken Language Is...'Terpene'

A firm conversation

The researchers have demonstrated that bacteria and fungi do in fact respond to each other. In other words: they can hold conversations. Group leader Paolina Garbeva explains: “Serratia, a soil bacterium, can ‘smell’ the fragrant terpenes produced by Fusarium, a plant pathogenic fungus. It responds by becoming motile and producing a terpene of its own.”

The researchers established this by studying which genes were switched ‘on’ by the bacterium, which proteins it began to produce and which fragrance. Or, in more fancy terms: by using transcriptomic, proteomic and metabolomic techniques. “Such fragrances — or volatile organic compounds — are not just some waste product, they are instruments targeted specifically at long-distance communication between these minute fungi and bacteria.”

But how widespread is this ‘language of smells’? Pathogenic soil fungi such as Fusarium also have an effect aboveground, where they make plants sick. Can they communicate with those plants? Garbeva: “We have known for some time that plants and insects use terpenes to communicate with each other. But we’ve only just begun to realise that it’s actually much wider. There is a much larger group of ‘Terpene-speakers’: micro-organisms.”

Fungi, protists, bacteria, and even higher animals. Terpenes act as pheromones — chemical signals used by animals — which makes them a regular ingredient of perfumes. So it’s likely that the language of terpenes forms a vast chemical communications network indeed.

Multilingual

Terpenes are by no means the only volatile organic compounds that are in for a good chat. The researchers found others as well: in the soil, for instance. Garbeva’s PhD student Ruth Schmidt, the first author of the article, adds: “Organisms are multilingual, but ‘Terpene’ is the one that’s used most often.”

Who knows, maybe without realising it we are native speakers too?

Froukje Rienks