Plants use sophisticated chemical sensors to avoid strangling their own kind

Health · Published 3 October 2026 Swipe more like this →

In short: Tendrils are not just simple coils; they are highly sensitive biological machines. By combining touch-sensitive thigmotropism with complex chemical signaling, these climbing organs actively navigate their environment. They can even distinguish between a sturdy support and a neighboring plant of the same species, choosing to avoid their own kin.

Tendrils are specialized plant organs derived from various structures, including stems, leaves, and inflorescences. Their primary function is to secure support for climbing plants, allowing them to reach the canopy and access more sunlight. While the mechanism of circumnutation—a circular, oscillatory growth pattern—helps tendrils locate physical structures, the actual coiling process is triggered by thigmotropism. When a tendril touches a support, sensitive cells initiate a calcium wave, triggering a cascade of phytohormones like GABA and jasmonate. This cascade activates proton pumps that alter osmotic pressure, causing cells to lose turgor and coil around the object.

Remarkably, climbing plants exhibit self-discrimination to avoid wasting energy on unstable supports. Research on Cayratia japonica reveals that these plants use chemoreception to detect conspecifics. When a tendril contacts a plant of the same species, signaling molecules—such as those found in oxalate crystals—bind to chemoreceptors, effectively inhibiting the thigmotropic pathway. This prevents the tendril from coiling around a neighbor, which would provide less stability than a rigid structure and increase competition for resources. This evolutionary adaptation ensures that climbing plants prioritize efficient growth by selecting only the most suitable anchors.

The diversity of these organs is immense, with 17 distinct types identified based on their ontogenetic origins and growth patterns. Some, like the aardvark cucumber, can produce up to eight tendrils at a single node, while others, like the chestnut vine, can reach lengths of 20.5 inches (52 centimeters). Beyond simple support, some tendrils serve specialized roles, such as the pitcher traps of Nepenthes plants, which form at the end of tendrils. Even the genetic basis for these structures is being harnessed; for instance, mutations in tendril-development genes in summer squash have been linked to yield-enhancing traits, demonstrating how these complex organs remain a focal point for both evolutionary biology and agricultural innovation.

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