What characteristic is associated with scotochromogens in Mycobacterium species?

Scotochromogens, which are a subgroup of Mycobacterium species, are characterized by their ability to produce pigment regardless of light exposure. This means they can generate pigment even in the absence of light, which distinguishes them from other groups such as photochromogens that only produce pigment in the light. The ability to develop pigment in the dark is a key identifying feature of scotochromogens, aiding in their classification and identification in microbiological studies.

The other characteristics outlined in the options relate to different groups within the Mycobacterium genus. For instance, the growth of some Mycobacterium species in light versus dark conditions does not apply to scotochromogens, as they are capable of producing pigment without light. Similarly, being colorless in both light and dark suggests characteristics of non-pigmented species, which does not describe scotochromogens. Lastly, the statement about not growing in culture is not applicable to scotochromogens, as they can be cultured under optimal conditions. Thus, the defining trait of scotochromogens is their capacity to produce pigment in the dark, making the correct answer clear.