Abstract
After self-pollination of Brugmansia suaveolens, a characteristic stacking of cisternae of the rough endoplasmic reticulum (RER) was seen in pollen tubes. The stacking commenced within less than 6 h after pollination and was the earliest noticeable ultrastructural change. This phenomenon was roughly coincident with a retarded growth rate of the pollen tubes. The RER formed intricate complexes consisting of combinations of two seemingly different arrangements, longitudinally stacked cisternae and concentric stacks. We present a model that interprets the stacked RER profiles as longitudinal sections through cylindrical formations with rounded ends. The appearance of profiles of RER aggregates in electron micrographs is determined by the angle of sectioning. Concentric profiles might be cross sections through such cylinders or sections through rounded or doughnut-shaped appendages.
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