Annulate lamellae in plant cells: Formation during microsporogenesis and pollen development in Canna generalis Bailey

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Abstract
The occurrence of stacked annulate lamellae is documented for a plant cell system, namely for pollen mother cells and developing pollen grains of Canna generalis. Their structural subarchitecture and relationship to endoplasmic reticulum (ER) and nuclear envelope cisternae is described in detail. The results demonstrate structural homology between plant and animal annulate lamellae and are compatible with, though do not prove, the view that annulate lamellar cisternae may originate as a degenerative form of endoplasmic reticulum.