Spiroplasma

Spiroplasma is a genus of bacteria in the class Mollicutes, known for their unique helical shape and motility. These bacteria are characterized by their lack of a cell wall, which is a common feature among members of the Mollicutes. Spiroplasma are primarily found in association with insects and plants, where they can exist as either symbionts or pathogens.

Morphology

Spiroplasma are distinguished by their spiral shape, which is a result of their helical filament structure. This morphology allows them to move in a corkscrew motion, which is unique among bacteria. The lack of a cell wall contributes to their flexibility and ability to navigate through viscous environments.

Habitat and Ecology

Spiroplasma species are commonly found in the gut of insects, where they can play a role in the host's digestion or act as pathogens. They are also known to infect plants, causing diseases such as corn stunt and citrus stubborn disease. The interaction between Spiroplasma and their hosts can vary from mutualistic to pathogenic, depending on the species and environmental conditions.

Pathogenicity

Some species of Spiroplasma are known to be pathogenic to plants and insects. For example, Spiroplasma citri is the causative agent of citrus stubborn disease, which affects citrus trees and leads to reduced fruit yield and quality. In insects, Spiroplasma can cause male-killing, a phenomenon where infected male offspring die during development, which can influence the population dynamics of the host species.

Research and Applications

Research on Spiroplasma has provided insights into bacterial motility, host-pathogen interactions, and the evolution of symbiotic relationships. Due to their unique motility mechanisms, Spiroplasma are studied as model organisms for understanding bacterial movement. Additionally, their interactions with insect hosts have implications for biological control strategies in agriculture.

Related pages

• Mollicutes
• Bacterial motility
• Symbiosis
• Pathogen

Spiroplasma gallery

• 

  Spiro