Intracellular Transport and Elimination of Resin from Epithelial Duct-cells of Pinus halepensis

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Abstract
The ultrastructure of the resin secreting cells of root ducts of young Pinus halepensis seedlings was studied. It is suggested that the endoplasmic reticulum (ER) in addition to taking part in resin synthesis also plays a role in transporting the resin from the plastids, mitochondria and nuclear envelope to the plasmalemma. By fusing with the plasmalemma the ER releases the resin to the outside of the protoplast. The resin produced in the ground cytoplasm and by the Golgi apparatus seems to be eliminated by plasmalemma invaginations.