Introduction

Orange lichens are common symbiotic organisms found growing on surfaces such as rocks, trees, and soil. The lichen is a mutualistic association between fungi and algae, and as such, they should not be considered as parasites. However, there is a growing concern among plant biologists that orange lichens may be robbing host plants of valuable resources, such as water. This article aims to explore whether or not orange lichens do indeed rob the host plant of water.

Lichen physiology

Before we dive into the possible effects of orange lichens on host plants, it is vital to understand a little bit about the physiology of the lichen. Orange lichens are composed of two distinct life forms that work together in a mutually beneficial partnership. The fungal partner provides structural support, protection, and access to nutrients, while the algal partner provides sugars and other essential organic compounds through photosynthesis. Lichens have a unique feature that distinguishes them from other photosynthetic organisms. They can absorb water directly through their surface, without the need for specialized root systems. This feature enables lichens to survive in extreme environments or where water is scarce.

Orange lichens and their effects on host plants

There is a long-standing debate about the effects of lichens on host plants. Some scientists argue that lichens may be beneficial to plants by covering the host plant's surface and protecting the plant from environmental stressors. However, others believe that lichens may be harmful to plants because they can cover the host plant's surface, blocking sunlight, and reducing the plant's photosynthesis capabilities. Additionally, some studies have suggested that lichens may absorb water from the host plant's surface, leading to water stress in the plant.

The evidence

Several studies have been conducted to determine whether or not lichens absorb water from the host plant's surface. One study conducted in 2015 found that lichens do indeed absorb water from the host plant's surface, but the amount of water absorbed was negligible. The study concluded that while lichens may adsorb small amounts of water from the host plant's surface, it does not cause significant damage to the plant.

Another study looked at the effects of lichen coverage on host plant's water relations. The study found that lichen coverage could reduce the rate of transpiration in host plants, leading to reduced water loss. Interestingly, nearly all of the studies that have looked into the effects of lichens on host plants have found that lichens are not significant water robbers, and the amount of moisture they collect is not sufficient to cause water stress in the host plant.

Conclusion

In conclusion, while orange lichens may absorb small amounts of water from the host plant's surface, they are not significant water robbers. The amount of water absorbed is negligible, and it does not cause significant damage to the plant. Additionally, some studies suggest that lichens may even be beneficial to host plants by reducing the rate of transpiration and protecting them from environmental stressors. Therefore, there is no need to be concerned about orange lichens and their potential effects on host plants.