Meiotic Spindle Plaques in Saccharomyces Cerevisiae

The plaque-hke spindle poles in bakers ' yeast have been observed by several investigators, bu t the relaUonship of these structures to the nuclear envelope has not been clearly shown Several authors have noted an association of the p laque wi th a nuclear pore. Rob inow and 3,{arak (10) repor ted t h a t mitot ic spindle plaques were "se t in to" nuclear pores, and according to M o o r (7) plaques are seen to be si tuated m nuclear pores also in freeze-etched mitotic ceils Rappor t (8) stated t ha t mitot ic an d meiotic plaques "s i t " on nuc lea r pores, even though the nuclear envelope is too poorly defined in her figures to v[suahze any association wi th the plaque.