THE SECRETORY CYCLE OF DIONAEA MUSCIPULA ELLIS

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Abstract
Summary: Autoradiography has been used to track the path of secretion in the digestive glands of Dionaea muscipula. Neither the dictyosomes nor dictyosomal vesicles appear to be involved, but radio‐label is lost rapidly from the endoplasmic reticulum and small osmiophilic vacuoles directly into the cell wall. Radiolabel is subsequently lost from the large osmiophilic vacuoles and accumulates in the small vacuoles. The effects of colchicine and cytochalasin B are complex. Both decrease the enzymatic activity of the secretion, but not the protein content, suggesting effects on the synthesis and discharge of secretion not directed against microtubules or microfilaments. It is proposed that the discharge of secretion occurs by direct fusion of ER to the plasmalemma or via vesicles and vacuoles derived from the ER.