Elater

Equisetum arvense strobili

Equisetum strob xs

Ptilidium pulcherrimum Sporen

Elater refers to a mechanism or structure in various organisms that aids in the dispersal or release of spores or seeds. It is most commonly associated with certain fungi, mosses, and liverworts, where it functions as a spring-like device that propels the spores or seeds away from the parent plant, thereby facilitating wider dispersal. The term "elater" can also refer to specific beetle family members, known as click beetles (Elateridae), which can snap their bodies to flip into the air as a defense mechanism. However, this article focuses on the biological dispersal mechanism.

Function and Mechanism

In the context of spore-bearing plants and fungi, elaters are often hygroscopic, meaning they can absorb and release moisture. This ability allows them to respond to changes in humidity by twisting or coiling, actions that help to eject spores into the air. The rapid movement caused by the elater's action increases the distance over which the spores can be dispersed, enhancing the organism's ability to colonize new areas.

In Mosses

In mosses, elaters are associated with the spore capsules of certain species. These elaters aid in the dispersal of spores by contracting and expanding in response to moisture changes, effectively throwing the spores out of the capsule. The presence and action of elaters are crucial for the reproductive success and distribution of these moss species.

In Liverworts

Liverworts also utilize elaters, but their structure and function can vary significantly from those in mosses. In liverworts, elaters are usually found within the spore capsules and work similarly to those in mosses, responding to humidity changes to assist in spore dispersal.

In Fungi

Some fungi possess elater-like structures that aid in spore release. These are not true elaters but function similarly by using changes in environmental conditions to propel spores into the air, thereby increasing the likelihood of spore dispersal to suitable growth substrates.

Evolutionary Significance

The evolution of elaters and similar mechanisms represents an important adaptation for non-vascular and lower vascular plants in terrestrial environments. By facilitating spore dispersal, these mechanisms help overcome the limitations of a sessile lifestyle, especially in habitats where water, essential for the dispersal of many cryptogams, is scarce or seasonal.

See Also

• Spore dispersal
• Moss
• Liverwort
• Fungi