Abstract
Incorporation of rhodamine- and fluorescein-isothiocyanate labeled bovine serum albumin (BSA-TRITC, BSA-FITC) was examined in different root zones of the 3-day-old seedlings in <em>Melandrium noctiflorum</em>, <em>Allium cepa</em> and <em>Zea mays</em>. The uptake of fluorescent-labeled BSA was found: (1) species-specific, (2) cell-type dependent, and (3) cytochalasin B-sensitive. The characteristic punctute distribution of vesicles within the cytoplasm suggests the internalization of labeled proteins by endocytosis.
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