抄録
Ultrastructural observation of isolates of Anabaena and Nostoc revealed the presence of variable diameter microtubule-like inclusions in Anabaena sp. (B-378), N. zetterstedtie, N. ellipsosporum (B-1623), N. punctiforme (1629), Nostoc sp. (389) and Nostoc sp. (387) and plasma membrane associated microtubule-like inclusions in N. ellipsosporum (B-383) and N. punctiforme (1629).
Variable diameter microtubule-like inclusions were found mainly in groups primarily in the central cytoplasm. They varied in diameter from 9.5 to 22nm and measured up to 1μm in length. They were found only in the small cuboidal cells of the various cell sizes and shapes observed in the cultures.
Plasma membrane associated microtubule-like structures were always oriented with the long axis perpendicular to the plasma membrane, and measured 15nm in diameter and up to 0.2μm in length.
Neither kind of microtubule-like structure is depolymerized by colchicine or preserved by potassium permanganate fixation. The structures are compared to similar structures in other cells.
