Development of a cellular body during differentiation of conidial chlamydospores in Fusarium
The development of cellular bodies during the conversion of conidial cells to chlamydospores in Fusarium sulphureum (F. sambucinum f.6) is described. Development of the bodies from dilated cisternae within the endoplasmic reticulum begins before there are other recognizable changes in cell structure and is completed before new cell wall material is laid down. Each body is bounded by a single membrane derived from the endoplasmic reticulum and contains electron-dense particles, vesicular structures, and usually a microbody. These components remain intact within the body until a late stage in chlamydospore development. At that time the contents become granular, the vesicles and microbodies disappear, and the body becomes vacuole-like. A similar body was found in cells of Fusarium poae at comparable stages of chlamydospore development.