Secondarily-forming Coated Vesicles in Ray Parenchyma Cells of Pinus radiata Needle Traces

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Abstract
Coated vesicles in ray parenchyma cells of Pinus radiata needle traces were observed to form secondarily from smooth vesicles. The nascent coated vesicles were seen as small protrusions of the bounding membrane of smooth vesicles. Initially they were ellipsoidal or dome shaped, later becoming spheroidal. Although a coat was observable at the spheroidal stage the coat was most pronounced in vesicles that had separated from parent smooth vesicles. Coated vesicles were most common near dictyosomes where they were often seen in stages of formation from smooth vesicles and in the cortical cytoplasm near the plasmalemma. The plasmalemma developed small protrusions some of which appeared coated at the cytoplasmic face.

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