Summary
Golgi bodies of immature carposporangia ofPolysiphonia sp. are composed of a polarized stack of six to ten curved cisternae. The cisternae are surrounded by 50–200 nm diameter slightly granular vesicles.
Hypertrophied, fibrillar Golgi cisternae occur in mature carposporangia. Secretory vesicles originate from ends of cisternae and by complete vesiculation of terminal cisternae; 0.6–1.2 μm diameter, fibrous vesicles, many with electron dense nucleoids are abundant throughout the cytoplasm of mature sporangia. Vesicles expand, fuse with each other and cluster around starch granules. Some vesicles secrete their content into the spore wall. Morphological analyses of starch granules as well as topographical relations between vesicles, starch granules and the adjacent cytoplasm suggest that these Golgi vesicles function like lysosomes. The significance of these observations is discussed in relation to the composition of plant cell walls and cellular expansion.
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Hawkins, E.K. Golgi vesicles of uncommon morphology and wall formation in the red alga,Polysiphonia . Protoplasma 80, 1–14 (1974). https://doi.org/10.1007/BF01666347
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DOI: https://doi.org/10.1007/BF01666347