Actinomycetes are a group of filamentous bacteria with a filamentous structure that is neither gram-positive or gram-negative. They are a diverse group of bacteria, with more than 1,000 species found in soil, water, and air. As a result, actinomycetes are important in the decomposition of organic matter.
Actinomycetes are classified using several criteria, including morphology, physiology, and sequences of the 16S rRNA gene. Morphologically, actinomycetes are divided into two major groups: the ray-shaped or branching actinomycetes, and the filamentous or spherical forms. Physiologically, actinomycetes are classified according to their metabolic capabilities and ability to produce antibiotics.
Sequences of the 16S rRNA gene are used to more accurately classify actinomycetes. This gene is important for identification and classification of bacteria, and is used to group actinomycetes into distinct species and genera. The 16S rRNA gene is used to compare the similarities and differences between species, and to group them into phylogenetic clades.
Overall, actinomycetes are classified using a combination of morphological, physiological, and genetic criteria. Through these criteria, actinomycetes can be accurately identified and classified, and the phylogeny of these bacteria can be understood.