Abstract
In homogenates of stem sections from etiolated pea (Pisum sativum L.) seedlings, secretory vesicles can be separated from Golgi-apparatus cisternae by rate-zonal centrifugation in renografin gradients. Optically, two bands of turbidity are observed, the uppermost containing the secretory vesicles and the lower one the Golgi-apparatus cisternae. The absence of glutaraldehyde in the homogenizing medium has allowed the effective characterization of marker-enzyme activities. Golgi-apparatus cisternae have been recognized by the presence of inosine-diphosphatase and glucan-synthase I activities as well as by electron microscopy. In contrast, although secretory vesicles also bear inosine diphosphatase they do not appear to possess glucan-synthase activity. Three plasma-membrane markers, NPA-binding, glucan synthase II, and KCl,Mg2+-adenosine triphosphatase (pH 6.5), were not detected in secretory vesicles. Pulse-chase experiments with [3H]glucose support our designation of secretory vesicles and Golgi-cisternal fractions.
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Abbreviations
- ER:
-
endoplasmic reticulum
- GSI, GSII:
-
glucan, synthase I, II, respectively
- IDPase:
-
inosine diphosphatase
- PM:
-
plasma membrane
- SV(s):
-
secretory vesicle(s)
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Taiz, L., Murry, M. & Robinson, D.G. Identification of secretory vesicles in homogenates of pea stem segments. Planta 158, 534–539 (1983). https://doi.org/10.1007/BF00397244
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DOI: https://doi.org/10.1007/BF00397244