Is the Lucaena Tree a Closing Plant?

Lucaena is a genus of flowering plants that belong to the legume family. These plants are native to tropical regions and are commonly known as "lead trees" because of their toughness and resilience. One of the biggest controversies surrounding the Lucaena tree is whether it is a closing plant or not. In this article, we explore what constitutes a closing plant, and whether the Lucaena tree meets this criterion or not.

What is a Closing Plant?

A closing plant is a type of plant that shrivels, closes its leaves or folds its branches in response to the touch. This phenomenon is also called "thigmonasty", and it occurs in many plants in different forms, ranging from curling of leaves to actual folding of branchlets. The function of thigmonasty is to protect the plant from potential harm, such as herbivores, by discouraging them from eating the leaves or branches.

Does the Lucaena Tree Exhibit Thigmonasty?

The answer to this question is not straightforward. While the Lucaena tree does respond to mechanical stimuli, such as touch or wind, it does not exhibit thigmonasty in the strict sense of the term. The leaves of the Lucaena tree remain open and exposed to environmental changes, including attacks from herbivores or harsh weather conditions.

However, studies have shown that the Lucaena tree is able to reduce water loss by retracting its leaflets during periods of drought or water scarcity. This adaptation allows the plant to conserve water and survive during prolonged dry spells. Additionally, the Lucaena tree is resistant to pests and diseases, which can be attributed to its toughness and chemical defenses.

The Debate Over the Closing Plant Label

The controversy over whether the Lucaena tree qualifies as a closing plant or not lies in the definition of thigmonasty. Some scientists argue that thigmonasty should be defined more broadly and include any form of mechanical sensitivity and movement in plants, while others believe that the term should be reserved for the specific response of closing or folding leaves in reaction to touch.

Despite the debate, it is undeniable that the Lucaena tree does exhibit some form of mechanical response and movement, which may be advantageous in its survival and growth. Whether it is a closing plant or not is ultimately a matter of interpretation and perspective.

In Conclusion

The Lucaena tree may not meet the strict definition of a closing plant, but it does exhibit a unique form of mechanical sensitivity and adaptation. Its ability to reduce water loss and withstand environmental stressors makes it a tough and resilient plant that can thrive in challenging conditions. Whether it is classified as a closing plant or not, the Lucaena tree is a fascinating species that continues to intrigue scientists and nature enthusiasts alike.