Nuclear Form as Related to Functional Activities of Normal and Pathological Cells

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Abstract
Cytological studies of plants infected with virus diseases show that the nucleus is hardly affected structurally. In tobacco mosaic there is a slight increase in size and a very slight irregularity in outline of the nucleus. Tobacco and dahlia mosaic tend to be inhibitive and destructive to the cell elements as well as to the plants. The very numerous and striking cases of nuclear deformation in specialized tissues in the lily are not obviously associated in any way with the presence of the x-bodies. The nucleus, the center of all physiological activity of the cell, during periods of very active and special phases of metabolism becomes exceedingly hy-pertrophied and irregular in form. Such hypertrophied nuclei with cleft, crenate, or furrowed membranes, or lobed, lobulate, or amoeboid outlines, occur normally in healthy plants, in special organs of nutrition, and associated with certain phases of nutritional and secretory activity.

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