Tobacco seeds - an ancient cultivated plant from America

Nicotiana - a diverse genus

The genus Nicotiana includes around 67 recognised species. Its natural centre of distribution lies in America, especially in South America, the Andes and Mexico. In addition, there are species in Australia, on Pacific islands and even one naturally occurring species in southern Africa.

The plants differ clearly in growth habit, flower colour and lifespan. Some species are cultivated as annuals, others grow as perennials or develop into semi-woody shrubs. Typical features are usually soft, often sticky-haired leaves and tubular or funnel-shaped flowers.

From cultivated tobacco to flowering tobacco

The economically most important species are Nicotiana tabacum and Nicotiana rustica. Nicotiana tabacum is the classic cultivated species from which numerous well-known tobacco types and variety groups have emerged. These include Virginia and Burley tobaccos, among others. Nicotiana rustica, often called Aztec tobacco, is known for its particularly high alkaloid content.

In addition, the genus has a distinctly decorative side. Species such as Nicotiana alata and Nicotiana sylvestris are cultivated as flowering tobacco and develop long, elegant tubular flowers. Many of these flowers open especially in the evening or release their strongest fragrance then, attracting night-active pollinators such as hawk moths.

A cultivated plant with a long history

Tobacco was cultivated in various Indigenous cultures of the Americas long before contact with Europe. Depending on the region, it played a role in rituals, social contexts and traditional healing concepts. Different Nicotiana species and different plant parts were used in very different cultural contexts.

With European expansion, tobacco seeds reached Europe in the 16th century. There, the plant was initially perceived not only as a stimulant, but also cultivated as a botanical curiosity, ornamental plant and supposed medicinal plant. Only later did tobacco consumption spread more widely in Europe.

Where does the name Nicotiana come from?

The botanical genus name Nicotiana recalls the French diplomat Jean Nicot. In the 16th century, he took an interest in the then still new plant and helped make it known in France. The term nicotine ultimately also derives from his name.

The actual history of the plant, however, goes back much further. Tobacco is an American cultivated plant whose use and breeding began long before its introduction to Europe.

Why does tobacco produce nicotine?

For the plant, nicotine is not a stimulant, but above all a defensive substance. It is formed mainly in the roots, then transported into the above-ground parts of the plant and concentrated especially in the leaves. There it helps the plant protect itself against various herbivores.

The chemical defence of Nicotiana is now an important field of research. Some wild tobaccos respond to feeding damage with changes in their defensive substances and therefore serve as model plants for studying relationships between plants and insects.

Tobacco as a research and model plant

Hardly any other classic cultivated plant has gained comparable importance in plant research. Nicotiana tabacum and especially Nicotiana benthamiana have been used for decades in genetics, virology, molecular biology and plant pathology.

Today, the significance of the genus therefore extends far beyond agriculture and garden culture. Tobacco plants help researchers understand fundamental biological processes and develop new biotechnological methods.

A poisonous plant with an impressive appearance

All Nicotiana species contain pharmacologically active alkaloids and should be treated as poisonous. The alkaloid content differs considerably depending on the species. Nicotiana rustica and some wild species in particular can contain high concentrations of various alkaloids.

Tobacco plants should therefore be cultivated in such a way that children and pets do not have unsupervised access. Caution is also advisable when handling larger quantities of fresh or wet leaves, as alkaloids can be absorbed through the skin.

Nevertheless, Nicotiana remains an extraordinary plant genus from both a botanical and cultural-historical perspective. Anyone who sows tobacco seeds encounters a plant that has shaped agriculture, trade, cultural history and science for centuries, while also bringing its very own garden character with large leaves and striking flowers.