The Fine Structure of the Quiescent Centre and Neighbouring Tissues3

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Abstract
The quiescent centre of the root meristem of Zea provides a source of undiffer-entiated, non-meristematic cells whose fine structure we have compared with that of the meristematic, non-differentiated cells of the meristem and that of the differentiated, non-meristematic cells of the cap. We have shown an association between the development of the endoplasmic reticulum and the development of cell walls. Differentiation in the cap is accompanied by a decrease in the number of mitochondria and plastics per unit volume of cytoplasm and an increase in their number per cell. There is an even greater increase in the number of Golgi bodies per cell. The structure of the mitochondria becomes more elaborate in differentiating cells especially in the cap and the Golgi increase their size in meristematic and differentiating cells. These differences are discussed in relation to some of the views about radiosensitivity and organization.

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