Summary
We have followed the action of brefeldin A (BFA) on the Golgi apparatus of developing pea cotyledons, the cells of which are actively engaged in the synthesis and deposition of storage proteins. The Golgi apparatus of normal cells is characterized by the presence of three different types of vesicle: smooth-surfaced secretory vesicles, “dense” vesicles which carry the storage proteins, and clathrin-coated vesicles (CCV). The dense vesicles originate at the cis cisternae and undergo a maturation as they pass through the Golgi stack, presumably as a result of cisternal progression. CCV bud off from dense and smooth vesicles, which may be attached to one another, at the trans pole of the Golgi apparatus. BFA eliminates the CCV and leads, initially, to an increase in the number and length of the cisternae. Dense vesicles are still to be seen, and many show an increase in diameter. Longer BFA treatments result in a trans-driven vesiculation and an accumulation of vesicles within the vicinity of single cisternae. The vesicles were sometimes seen to be connected to one another via a network of tubules. As judged by immunocytochemistry with gold-coupled legumin and vicilin antisera, some of the dilated vesicles originate directly from dense vesicles by swelling whereas others probably arise by dilation of Golgi cisternae since they possess a layer of flocculent storage proteins at their periphery. By contrast the centre of the dilated vesicles labels positively with antibodies against complex glycans, indicating that the ability to segregate storage proteins from cell wall or lytic vacuole glycoproteins is lost during extended BFA treatment. The effects of BFA are reversible when cotyledons are further incubated on Gamborg's medium for 5 h without the inhibitor.
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Dedicated to Professor R. Kollmann on the occasion of his 65th birthday.
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Robinson, D.G., Bäumer, M., Hinz, G. et al. Ultrastructure of the pea cotyledon Golgi apparatus: Origin of dense vesicles and the action of brefeldin A. Protoplasma 200, 198–209 (1997). https://doi.org/10.1007/BF01283295
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DOI: https://doi.org/10.1007/BF01283295