On the Site of Tannin Synthesis in Plant Cells

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Abstract
The development of vacuolar tannins in callus and suspension cultures of Douglas-fir [Pseudotsuga menziesii] and loblolly pine [Pinus taeda] was monitored by transmission electron microscopy. The only observed site of prevacuolar tannin was the rough endoplasmic reticulum, which gave rise to small, tannin-containing vacuoles. Other potentially related sites suggested in the literature (namely, plastids, dictyosomes) were not observed to be directly involved. These observations are in general agreement with recent reports on tannin production in conifer callus and in ray parenchyma of fir.

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