Some plants produce a red or milky colored liquid when cut due to the presence of chemical compounds such as tannins, anthocyanins or latex, which can serve as protection against predators or seal wounds.
Plant latex is a type of thick sap produced by certain plants. It circulates in special channels called laticifers, located in different parts such as leaves, stems, and roots. The composition varies quite a bit depending on the plant, but it often contains water, sugars, proteins, and especially chemical compounds like alkaloids or terpenes. These chemical substances give latex its particular properties, such as its sticky, irritating, or toxic appearance in some species. The most well-known plants for their latex include rubber trees, from which natural rubber is extracted, as well as the common dandelion and the fig tree, which produce a characteristic white sap as soon as they are cut.
When you cut certain plants, the sap that flows contains compounds called polyphenols. Upon contact with air (and thus oxygen), these polyphenols undergo a chemical reaction: this is oxidation. This phenomenon leads to a transformation, somewhat like a cut apple that browns in a few minutes. This reaction produces molecules called quinones, which are responsible for the reddish or brownish color. Some plants, like the dragon tree (the famous "dragon's blood"), use this natural red pigment as protection against injuries and external attacks.
When you cut certain plants, they release a thick sap often called latex, rich in chemical compounds that repel herbivores. These substances usually have a bitter or even toxic taste, discouraging those who might want to nibble on the plant. This sap can also "stick" to the mouthparts of the harmful insect, making its meal quite unpleasant. Additionally, this latex acts as a true natural barrier against infections by preventing bacteria and fungi from entering through the open wound. In other words, it's like a quick immune defense for the plant, somewhat like the scab that protects your wounded knee from microbes.
When you cut a plant and it produces latex, it's a bit like when you scrape your skin: it flows out quickly to close the wound and prevent intrusions. This latex acts like a real little natural bandage, forming a physical barrier against bacteria or fungi that might try their luck. In this sticky juice, there are plenty of substances with antiseptic properties, capable of eliminating or limiting the proliferation of infectious agents. Some plants even have compounds with truly healing virtues, facilitating the regeneration of damaged plant tissues. In short, a latex that protects, fights microbes, and gets tissues back on their feet—pretty handy, right?
Some butterflies (like the Monarch) exclusively feed on plants that produce toxic latex, such as milkweed, in order to become toxic themselves and repel their predators!
Some compounds found in plant latex, such as those from the opium poppy (Papaver somniferum), have pharmaceutical properties that can be transformed into powerful pain relief medications (analgesics).
Although plant latex often has insecticidal and protective properties, that of certain plants can be toxic or irritating to humans—this is the case with latex from euphorbia, which should be handled with caution.
In some plants such as Dragon's Blood (Dracaena cinnabari), the reddish sap known as 'dragon's blood' was long used as a pigment for varnishes, paints, and inks in antiquity.
It depends on the plants: some plant latex, such as that from the ficus, can cause skin irritations or allergies. Others, like that from euphorbia plants, can even be toxic. Therefore, it is recommended to wear gloves when handling these plants.
The red hue is often due to the rapid oxidation of chemical compounds, such as tannins and anthocyanins, present in the latex. This oxidation process, which gives a blood-like appearance, is generally an additional defense strategy against herbivores, simulating a sign of injury or toxicity.
It is recommended to wear gloves to avoid any direct contact that may irritate or cause allergic reactions, and to use clean and disinfected tools in order to prevent the spread of diseases and ensure proper healing of the plant.
No, plant latex comes from various botanical families. Although families such as the Euphorbiaceae or Moraceae are commonly involved, their only common feature is their defense mechanism through latex secretion, but they are not necessarily closely related evolutionarily.
Sure! Here's the translation: "Yes, for a long time, certain cultures have used natural latex from specific species for its medicinal properties. For example, the latex from the fig tree is traditionally recognized for its healing properties. However, caution is advised regarding the specific toxicities or possible allergic reactions associated with each type of latex."
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