Nucleoli in Agropyron repens, Beauv

Abstract

DURING an investigation of the shoot apex of Agropyron repens, Beauv., longitudinal sections were obtained in which the nucleoli stood out in strong contrast to the rest of the nucleus. When this was noticed, counts were made and the maximum number per nucleus was found to be six. Photograph A shows the six nucleoli in the nucleus of a developing sclerenchyma cell, while B shows the six in the nucleus of a procambium initial. Sometimes there was a suggestion that the nucleoli were of three sizes, a large pair, a slightly smaller pair and a small pair, though this was not at all definite, and the appearance shown in A and B seemed more common (? some nucleoli only partly represented in the sections).