Nuclear Dry Mass and Area in Epidermal Cells of Senescing Soybean Cotyledons

The nuclear dry mass and area of epidermal cells of senescingsoybean cotyledons were measured with an interference microscopeand found to decrease until cotyledon abscission. Decapitationafter germination prevented yellowing and abscission of cotyledonsand the decrease of both nuclear dry mass and area. The meansof nuclear dry mass and area for normal and decapitated cotyledonswere highly correlated in two experiments, r=0.0.76 and 0.90respectively.     

Effect of Exposure to Ambient Atmosphere on Nucleolar Size and DNA, RNA, and Protein Content of Allium cepa Epidermal Nuclei

Exposure of previously protected onion leaf base outer epidermisto the ambient atmosphere resulted in an increase in nucleolarsize and nuclear RNA and protein content while nuclear DNA contentand average number of nucleoli per nucleus were unchanged.     

Increase in Allium cepa Nuclear Dry Mass Following Exposure to Ambient Atmosphere

Nuclear dry mass of outer epidermal cells of onion leaf basesincreased following exposure of previously protected tissueto the ambient atmosphere. After 48 h of exposure, average nucleardry mass increased as much as 78 percent over the initial value(newly exposed tissue). Nuclear area also increased after exposure.Wounding did not prevent nuclear dry mass increases, but didprevent significant changes in nuclear area.