ISHS Acta Horticulturae 436: I International Persimmon Symposium
FINE STRUCTURE OF TANNIN CELLS IN FRUIT AND CALLUS TISSUES OF PERSIMMON |
| Authors: | K. Yonemori, M. Oshida, A. Sugiura |
| Keywords: | callus tissues, Diospyros kaki, persimmon, tannin cell |
| Abstract:
Transmission electron microscopic observations of tannin cells in persimmon were carried out to characterize their morphological properties, in comparison with those in callus tissues derived from leaf primordium of dormant buds. Tannin cells appeared in the ovary before anthesis, and tannins were filled out quickly within their vacuoles. However, we could not distinguish tannin cells from parenchyma cells until tannin cells accumulate tannins in the vacuole. As for tannin cells in callus tissues, there were also no differences in structure compared with parenchyma cells, except for the presence of tannins in the vacuole. However, brown-colored compounds, supposedly oxidative products of tannin, were observed at intercellular spaces in dark brown callus. It indicated the presence of excretive mechanism of tannins from the cell. | |
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