Intracellular Distribution of Proteins in Pea Cotyledons

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Abstract
As a part of a study of organ and cellular senescence in plants, the structural and functional changes which occur in the cotyledons of germinating peas are delineated. As might have been expected from earlier reports that cotyledon cells are capable of performing oxidative phosphorylation, incorporation of labeled amino acids into protein and synthesis of certain enzymes, examination by electron microscopy showed the presence of all structures normally present in plant cells. In addition, a major fraction of the cell volume was found to be occupied with relatively large, roughly spherical bodies with no visible internal structure. The data presented here indicate that the reserve globulins are localized in these structures. These structures are easily isolated as a pellet following centrifugation of a pea cotyledon homogenate.

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